deps: update nghttp2 to 1.42.0

Refs: https://github.com/nghttp2/nghttp2/releases/tag/v1.42.0

PR-URL: https://github.com/nodejs/node/pull/36842
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

15 files changed, 3109 insertions, 78 deletions

diff --git a/deps/nghttp2/lib/CMakeLists.txt b/deps/nghttp2/lib/CMakeLists.txt
new file mode 100644
index 00000000000..a02a534b1a8
--- /dev/null
+++ b/deps/nghttp2/lib/CMakeLists.txt
@@ -0,0 +1,77 @@
+add_subdirectory(includes)
+
+include_directories(
+  "${CMAKE_CURRENT_SOURCE_DIR}/includes"
+  "${CMAKE_CURRENT_BINARY_DIR}/includes"
+)
+
+add_definitions(-DBUILDING_NGHTTP2)
+
+set(NGHTTP2_SOURCES
+  nghttp2_pq.c nghttp2_map.c nghttp2_queue.c
+  nghttp2_frame.c
+  nghttp2_buf.c
+  nghttp2_stream.c nghttp2_outbound_item.c
+  nghttp2_session.c nghttp2_submit.c
+  nghttp2_helper.c
+  nghttp2_npn.c
+  nghttp2_hd.c nghttp2_hd_huffman.c nghttp2_hd_huffman_data.c
+  nghttp2_version.c
+  nghttp2_priority_spec.c
+  nghttp2_option.c
+  nghttp2_callbacks.c
+  nghttp2_mem.c
+  nghttp2_http.c
+  nghttp2_rcbuf.c
+  nghttp2_debug.c
+  nghttp2_ksl.c
+)
+
+set(NGHTTP2_RES "")
+
+if(WIN32)
+  configure_file(
+    version.rc.in
+    ${CMAKE_CURRENT_BINARY_DIR}/version.rc
+    @ONLY)
+
+  set(NGHTTP2_RES ${CMAKE_CURRENT_BINARY_DIR}/version.rc)
+endif()
+
+# Public shared library
+if(ENABLE_SHARED_LIB)
+  add_library(nghttp2 SHARED ${NGHTTP2_SOURCES} ${NGHTTP2_RES})
+  set_target_properties(nghttp2 PROPERTIES
+    COMPILE_FLAGS "${WARNCFLAGS}"
+    VERSION ${LT_VERSION} SOVERSION ${LT_SOVERSION}
+    C_VISIBILITY_PRESET hidden
+  )
+  target_include_directories(nghttp2 INTERFACE
+    "${CMAKE_CURRENT_BINARY_DIR}/includes"
+    "${CMAKE_CURRENT_SOURCE_DIR}/includes"
+  )
+
+  install(TARGETS nghttp2
+    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
+endif()
+
+if(HAVE_CUNIT OR ENABLE_STATIC_LIB)
+  # Static library (for unittests because of symbol visibility)
+  add_library(nghttp2_static STATIC ${NGHTTP2_SOURCES})
+  set_target_properties(nghttp2_static PROPERTIES
+    COMPILE_FLAGS "${WARNCFLAGS}"
+    VERSION ${LT_VERSION} SOVERSION ${LT_SOVERSION}
+    ARCHIVE_OUTPUT_NAME nghttp2${STATIC_LIB_SUFFIX}
+  )
+  target_compile_definitions(nghttp2_static PUBLIC "-DNGHTTP2_STATICLIB")
+  if(ENABLE_STATIC_LIB)
+    install(TARGETS nghttp2_static
+      DESTINATION "${CMAKE_INSTALL_LIBDIR}")
+  endif()
+endif()
+
+
+install(FILES "${CMAKE_CURRENT_BINARY_DIR}/libnghttp2.pc"
+  DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
diff --git a/deps/nghttp2/lib/Makefile.am b/deps/nghttp2/lib/Makefile.am
index 24a5bd62645..63fa0fa8324 100644
--- a/deps/nghttp2/lib/Makefile.am
+++ b/deps/nghttp2/lib/Makefile.am
@@ -49,7 +49,8 @@ OBJECTS = nghttp2_pq.c nghttp2_map.c nghttp2_queue.c \
 	nghttp2_mem.c \
 	nghttp2_http.c \
 	nghttp2_rcbuf.c \
-	nghttp2_debug.c
+	nghttp2_debug.c \
+	nghttp2_ksl.c
 
 HFILES = nghttp2_pq.h nghttp2_int.h nghttp2_map.h nghttp2_queue.h \
 	nghttp2_frame.h \
@@ -65,7 +66,8 @@ HFILES = nghttp2_pq.h nghttp2_int.h nghttp2_map.h nghttp2_queue.h \
 	nghttp2_mem.h \
 	nghttp2_http.h \
 	nghttp2_rcbuf.h \
-	nghttp2_debug.h
+	nghttp2_debug.h \
+	nghttp2_ksl.h
 
 libnghttp2_la_SOURCES = $(HFILES) $(OBJECTS)
 libnghttp2_la_LDFLAGS = -no-undefined \
diff --git a/deps/nghttp2/lib/Makefile.in b/deps/nghttp2/lib/Makefile.in
new file mode 100644
index 00000000000..14ec74591ba
--- /dev/null
+++ b/deps/nghttp2/lib/Makefile.in
@@ -0,0 +1,1028 @@
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+libdir = @libdir@
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+mandir = @mandir@
+mkdir_p = @mkdir_p@
+oldincludedir = @oldincludedir@
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+pkgpyexecdir = @pkgpyexecdir@
+pkgpythondir = @pkgpythondir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+pyexecdir = @pyexecdir@
+pythondir = @pythondir@
+runstatedir = @runstatedir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+target = @target@
+target_alias = @target_alias@
+target_cpu = @target_cpu@
+target_os = @target_os@
+target_vendor = @target_vendor@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+EXTRA_DIST = CMakeLists.txt
+nobase_include_HEADERS = nghttp2/nghttp2.h nghttp2/nghttp2ver.h
+all: all-am
+
+.SUFFIXES:
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu lib/includes/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu lib/includes/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+install-nobase_includeHEADERS: $(nobase_include_HEADERS)
+	@$(NORMAL_INSTALL)
+	@list='$(nobase_include_HEADERS)'; test -n "$(includedir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(includedir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(includedir)" || exit 1; \
+	fi; \
+	$(am__nobase_list) | while read dir files; do \
+	  xfiles=; for file in $$files; do \
+	    if test -f "$$file"; then xfiles="$$xfiles $$file"; \
+	    else xfiles="$$xfiles $(srcdir)/$$file"; fi; done; \
+	  test -z "$$xfiles" || { \
+	    test "x$$dir" = x. || { \
+	      echo " $(MKDIR_P) '$(DESTDIR)$(includedir)/$$dir'"; \
+	      $(MKDIR_P) "$(DESTDIR)$(includedir)/$$dir"; }; \
+	    echo " $(INSTALL_HEADER) $$xfiles '$(DESTDIR)$(includedir)/$$dir'"; \
+	    $(INSTALL_HEADER) $$xfiles "$(DESTDIR)$(includedir)/$$dir" || exit $$?; }; \
+	done
+
+uninstall-nobase_includeHEADERS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(nobase_include_HEADERS)'; test -n "$(includedir)" || list=; \
+	$(am__nobase_strip_setup); files=`$(am__nobase_strip)`; \
+	dir='$(DESTDIR)$(includedir)'; $(am__uninstall_files_from_dir)
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-am
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(HEADERS)
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+	for dir in "$(DESTDIR)$(includedir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
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+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic distclean-tags
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+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
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+info-am:
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+install-data-am: install-nobase_includeHEADERS
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+install-dvi: install-dvi-am
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+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
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+install-ps-am:
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+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
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+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool
+
+pdf: pdf-am
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+pdf-am:
+
+ps: ps-am
+
+ps-am:
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+uninstall-am: uninstall-nobase_includeHEADERS
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am check check-am clean clean-generic \
+	clean-libtool cscopelist-am ctags ctags-am distclean \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man \
+	install-nobase_includeHEADERS install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-nobase_includeHEADERS
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/deps/nghttp2/lib/includes/nghttp2/nghttp2.h b/deps/nghttp2/lib/includes/nghttp2/nghttp2.h
index 9be6eea5c02..d9fae5bf0c1 100644
--- a/deps/nghttp2/lib/includes/nghttp2/nghttp2.h
+++ b/deps/nghttp2/lib/includes/nghttp2/nghttp2.h
@@ -2851,9 +2851,11 @@ NGHTTP2_EXTERN void nghttp2_session_del(nghttp2_session *session);
  *
  * This function retrieves the highest prioritized frame from the
  * outbound queue and sends it to the remote peer.  It does this as
- * many as possible until the user callback
+ * many times as possible until the user callback
  * :type:`nghttp2_send_callback` returns
- * :enum:`NGHTTP2_ERR_WOULDBLOCK` or the outbound queue becomes empty.
+ * :enum:`NGHTTP2_ERR_WOULDBLOCK`, the outbound queue becomes empty
+ * or flow control is triggered (remote window size becomes depleted
+ * or maximum number of concurrent streams is reached).
  * This function calls several callback functions which are passed
  * when initializing the |session|.  Here is the simple time chart
  * which tells when each callback is invoked:
diff --git a/deps/nghttp2/lib/includes/nghttp2/nghttp2ver.h b/deps/nghttp2/lib/includes/nghttp2/nghttp2ver.h
index 795a44c1e86..ff6bf3d3b22 100644
--- a/deps/nghttp2/lib/includes/nghttp2/nghttp2ver.h
+++ b/deps/nghttp2/lib/includes/nghttp2/nghttp2ver.h
@@ -29,7 +29,7 @@
  * @macro
  * Version number of the nghttp2 library release
  */
-#define NGHTTP2_VERSION "1.41.0"
+#define NGHTTP2_VERSION "1.42.0"
 
 /**
  * @macro
@@ -37,6 +37,6 @@
  * release. This is a 24 bit number with 8 bits for major number, 8 bits
  * for minor and 8 bits for patch. Version 1.2.3 becomes 0x010203.
  */
-#define NGHTTP2_VERSION_NUM 0x012900
+#define NGHTTP2_VERSION_NUM 0x012a00
 
 #endif /* NGHTTP2VER_H */
diff --git a/deps/nghttp2/lib/includes/nghttp2/nghttp2ver.h.in b/deps/nghttp2/lib/includes/nghttp2/nghttp2ver.h.in
new file mode 100644
index 00000000000..7717a647f75
--- /dev/null
+++ b/deps/nghttp2/lib/includes/nghttp2/nghttp2ver.h.in
@@ -0,0 +1,42 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2012, 2013 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef NGHTTP2VER_H
+#define NGHTTP2VER_H
+
+/**
+ * @macro
+ * Version number of the nghttp2 library release
+ */
+#define NGHTTP2_VERSION "@PACKAGE_VERSION@"
+
+/**
+ * @macro
+ * Numerical representation of the version number of the nghttp2 library
+ * release. This is a 24 bit number with 8 bits for major number, 8 bits
+ * for minor and 8 bits for patch. Version 1.2.3 becomes 0x010203.
+ */
+#define NGHTTP2_VERSION_NUM @PACKAGE_VERSION_NUM@
+
+#endif /* NGHTTP2VER_H */
diff --git a/deps/nghttp2/lib/nghttp2_buf.c b/deps/nghttp2/lib/nghttp2_buf.c
index 2a435bebf92..a32844712e4 100644
--- a/deps/nghttp2/lib/nghttp2_buf.c
+++ b/deps/nghttp2/lib/nghttp2_buf.c
@@ -82,8 +82,10 @@ void nghttp2_buf_reset(nghttp2_buf *buf) {
 }
 
 void nghttp2_buf_wrap_init(nghttp2_buf *buf, uint8_t *begin, size_t len) {
-  buf->begin = buf->pos = buf->last = buf->mark = begin;
-  buf->end = begin + len;
+  buf->begin = buf->pos = buf->last = buf->mark = buf->end = begin;
+  if (len) {
+    buf->end += len;
+  }
 }
 
 static int buf_chain_new(nghttp2_buf_chain **chain, size_t chunk_length,
diff --git a/deps/nghttp2/lib/nghttp2_frame.c b/deps/nghttp2/lib/nghttp2_frame.c
index 4821de40885..382a26c818d 100644
--- a/deps/nghttp2/lib/nghttp2_frame.c
+++ b/deps/nghttp2/lib/nghttp2_frame.c
@@ -818,8 +818,10 @@ int nghttp2_frame_unpack_origin_payload(nghttp2_extension *frame,
   size_t len = 0;
 
   origin = frame->payload;
-  p = payload;
-  end = p + payloadlen;
+  p = end = payload;
+  if (payloadlen) {
+    end += payloadlen;
+  }
 
   for (; p != end;) {
     if (end - p < 2) {
@@ -897,9 +899,25 @@ nghttp2_settings_entry *nghttp2_frame_iv_copy(const nghttp2_settings_entry *iv,
 }
 
 int nghttp2_nv_equal(const nghttp2_nv *a, const nghttp2_nv *b) {
-  return a->namelen == b->namelen && a->valuelen == b->valuelen &&
-         memcmp(a->name, b->name, a->namelen) == 0 &&
-         memcmp(a->value, b->value, a->valuelen) == 0;
+  if (a->namelen != b->namelen || a->valuelen != b->valuelen) {
+    return 0;
+  }
+
+  if (a->name == NULL || b->name == NULL) {
+    assert(a->namelen == 0);
+    assert(b->namelen == 0);
+  } else if (memcmp(a->name, b->name, a->namelen) != 0) {
+    return 0;
+  }
+
+  if (a->value == NULL || b->value == NULL) {
+    assert(a->valuelen == 0);
+    assert(b->valuelen == 0);
+  } else if (memcmp(a->value, b->value, a->valuelen) != 0) {
+    return 0;
+  }
+
+  return 1;
 }
 
 void nghttp2_nv_array_del(nghttp2_nv *nva, nghttp2_mem *mem) {
diff --git a/deps/nghttp2/lib/nghttp2_ksl.c b/deps/nghttp2/lib/nghttp2_ksl.c
new file mode 100644
index 00000000000..dffd1cbcffc
--- /dev/null
+++ b/deps/nghttp2/lib/nghttp2_ksl.c
@@ -0,0 +1,707 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2020 nghttp2 contributors
+ * Copyright (c) 2018 ngtcp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "nghttp2_ksl.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <stdio.h>
+
+#include "nghttp2_mem.h"
+
+static size_t ksl_nodelen(size_t keylen) {
+  return (sizeof(nghttp2_ksl_node) + keylen - sizeof(uint64_t) + 0xf) &
+         (size_t)~0xf;
+}
+
+static size_t ksl_blklen(size_t nodelen) {
+  return sizeof(nghttp2_ksl_blk) + nodelen * NGHTTP2_KSL_MAX_NBLK -
+         sizeof(uint64_t);
+}
+
+/*
+ * ksl_node_set_key sets |key| to |node|.
+ */
+static void ksl_node_set_key(nghttp2_ksl *ksl, nghttp2_ksl_node *node,
+                             const void *key) {
+  memcpy(node->key, key, ksl->keylen);
+}
+
+int nghttp2_ksl_init(nghttp2_ksl *ksl, nghttp2_ksl_compar compar, size_t keylen,
+                     nghttp2_mem *mem) {
+  size_t nodelen = ksl_nodelen(keylen);
+  size_t blklen = ksl_blklen(nodelen);
+  nghttp2_ksl_blk *head;
+
+  ksl->head = nghttp2_mem_malloc(mem, blklen);
+  if (!ksl->head) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+  ksl->front = ksl->back = ksl->head;
+  ksl->compar = compar;
+  ksl->keylen = keylen;
+  ksl->nodelen = nodelen;
+  ksl->n = 0;
+  ksl->mem = mem;
+
+  head = ksl->head;
+  head->next = head->prev = NULL;
+  head->n = 0;
+  head->leaf = 1;
+
+  return 0;
+}
+
+/*
+ * ksl_free_blk frees |blk| recursively.
+ */
+static void ksl_free_blk(nghttp2_ksl *ksl, nghttp2_ksl_blk *blk) {
+  size_t i;
+
+  if (!blk->leaf) {
+    for (i = 0; i < blk->n; ++i) {
+      ksl_free_blk(ksl, nghttp2_ksl_nth_node(ksl, blk, i)->blk);
+    }
+  }
+
+  nghttp2_mem_free(ksl->mem, blk);
+}
+
+void nghttp2_ksl_free(nghttp2_ksl *ksl) {
+  if (!ksl) {
+    return;
+  }
+
+  ksl_free_blk(ksl, ksl->head);
+}
+
+/*
+ * ksl_split_blk splits |blk| into 2 nghttp2_ksl_blk objects.  The new
+ * nghttp2_ksl_blk is always the "right" block.
+ *
+ * It returns the pointer to the nghttp2_ksl_blk created which is the
+ * located at the right of |blk|, or NULL which indicates out of
+ * memory error.
+ */
+static nghttp2_ksl_blk *ksl_split_blk(nghttp2_ksl *ksl, nghttp2_ksl_blk *blk) {
+  nghttp2_ksl_blk *rblk;
+
+  rblk = nghttp2_mem_malloc(ksl->mem, ksl_blklen(ksl->nodelen));
+  if (rblk == NULL) {
+    return NULL;
+  }
+
+  rblk->next = blk->next;
+  blk->next = rblk;
+  if (rblk->next) {
+    rblk->next->prev = rblk;
+  } else if (ksl->back == blk) {
+    ksl->back = rblk;
+  }
+  rblk->prev = blk;
+  rblk->leaf = blk->leaf;
+
+  rblk->n = blk->n / 2;
+
+  memcpy(rblk->nodes, blk->nodes + ksl->nodelen * (blk->n - rblk->n),
+         ksl->nodelen * rblk->n);
+
+  blk->n -= rblk->n;
+
+  assert(blk->n >= NGHTTP2_KSL_MIN_NBLK);
+  assert(rblk->n >= NGHTTP2_KSL_MIN_NBLK);
+
+  return rblk;
+}
+
+/*
+ * ksl_split_node splits a node included in |blk| at the position |i|
+ * into 2 adjacent nodes.  The new node is always inserted at the
+ * position |i+1|.
+ *
+ * It returns 0 if it succeeds, or one of the following negative error
+ * codes:
+ *
+ * NGHTTP2_ERR_NOMEM
+ *   Out of memory.
+ */
+static int ksl_split_node(nghttp2_ksl *ksl, nghttp2_ksl_blk *blk, size_t i) {
+  nghttp2_ksl_node *node;
+  nghttp2_ksl_blk *lblk = nghttp2_ksl_nth_node(ksl, blk, i)->blk, *rblk;
+
+  rblk = ksl_split_blk(ksl, lblk);
+  if (rblk == NULL) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  memmove(blk->nodes + (i + 2) * ksl->nodelen,
+          blk->nodes + (i + 1) * ksl->nodelen,
+          ksl->nodelen * (blk->n - (i + 1)));
+
+  node = nghttp2_ksl_nth_node(ksl, blk, i + 1);
+  node->blk = rblk;
+  ++blk->n;
+  ksl_node_set_key(ksl, node,
+                   nghttp2_ksl_nth_node(ksl, rblk, rblk->n - 1)->key);
+
+  node = nghttp2_ksl_nth_node(ksl, blk, i);
+  ksl_node_set_key(ksl, node,
+                   nghttp2_ksl_nth_node(ksl, lblk, lblk->n - 1)->key);
+
+  return 0;
+}
+
+/*
+ * ksl_split_head splits a head (root) block.  It increases the height
+ * of skip list by 1.
+ *
+ * It returns 0 if it succeeds, or one of the following negative error
+ * codes:
+ *
+ * NGHTTP2_ERR_NOMEM
+ *   Out of memory.
+ */
+static int ksl_split_head(nghttp2_ksl *ksl) {
+  nghttp2_ksl_blk *rblk = NULL, *lblk, *nhead = NULL;
+  nghttp2_ksl_node *node;
+
+  rblk = ksl_split_blk(ksl, ksl->head);
+  if (rblk == NULL) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  lblk = ksl->head;
+
+  nhead = nghttp2_mem_malloc(ksl->mem, ksl_blklen(ksl->nodelen));
+  if (nhead == NULL) {
+    nghttp2_mem_free(ksl->mem, rblk);
+    return NGHTTP2_ERR_NOMEM;
+  }
+  nhead->next = nhead->prev = NULL;
+  nhead->n = 2;
+  nhead->leaf = 0;
+
+  node = nghttp2_ksl_nth_node(ksl, nhead, 0);
+  ksl_node_set_key(ksl, node,
+                   nghttp2_ksl_nth_node(ksl, lblk, lblk->n - 1)->key);
+  node->blk = lblk;
+
+  node = nghttp2_ksl_nth_node(ksl, nhead, 1);
+  ksl_node_set_key(ksl, node,
+                   nghttp2_ksl_nth_node(ksl, rblk, rblk->n - 1)->key);
+  node->blk = rblk;
+
+  ksl->head = nhead;
+
+  return 0;
+}
+
+/*
+ * insert_node inserts a node whose key is |key| with the associated
+ * |data| at the index of |i|.  This function assumes that the number
+ * of nodes contained by |blk| is strictly less than
+ * NGHTTP2_KSL_MAX_NBLK.
+ */
+static void ksl_insert_node(nghttp2_ksl *ksl, nghttp2_ksl_blk *blk, size_t i,
+                            const nghttp2_ksl_key *key, void *data) {
+  nghttp2_ksl_node *node;
+
+  assert(blk->n < NGHTTP2_KSL_MAX_NBLK);
+
+  memmove(blk->nodes + (i + 1) * ksl->nodelen, blk->nodes + i * ksl->nodelen,
+          ksl->nodelen * (blk->n - i));
+
+  node = nghttp2_ksl_nth_node(ksl, blk, i);
+  ksl_node_set_key(ksl, node, key);
+  node->data = data;
+
+  ++blk->n;
+}
+
+static size_t ksl_bsearch(nghttp2_ksl *ksl, nghttp2_ksl_blk *blk,
+                          const nghttp2_ksl_key *key,
+                          nghttp2_ksl_compar compar) {
+  ssize_t left = -1, right = (ssize_t)blk->n, mid;
+  nghttp2_ksl_node *node;
+
+  while (right - left > 1) {
+    mid = (left + right) / 2;
+    node = nghttp2_ksl_nth_node(ksl, blk, (size_t)mid);
+    if (compar((nghttp2_ksl_key *)node->key, key)) {
+      left = mid;
+    } else {
+      right = mid;
+    }
+  }
+
+  return (size_t)right;
+}
+
+int nghttp2_ksl_insert(nghttp2_ksl *ksl, nghttp2_ksl_it *it,
+                       const nghttp2_ksl_key *key, void *data) {
+  nghttp2_ksl_blk *blk = ksl->head;
+  nghttp2_ksl_node *node;
+  size_t i;
+  int rv;
+
+  if (blk->n == NGHTTP2_KSL_MAX_NBLK) {
+    rv = ksl_split_head(ksl);
+    if (rv != 0) {
+      return rv;
+    }
+    blk = ksl->head;
+  }
+
+  for (;;) {
+    i = ksl_bsearch(ksl, blk, key, ksl->compar);
+
+    if (blk->leaf) {
+      if (i < blk->n &&
+          !ksl->compar(key, nghttp2_ksl_nth_node(ksl, blk, i)->key)) {
+        if (it) {
+          *it = nghttp2_ksl_end(ksl);
+        }
+        return NGHTTP2_ERR_INVALID_ARGUMENT;
+      }
+      ksl_insert_node(ksl, blk, i, key, data);
+      ++ksl->n;
+      if (it) {
+        nghttp2_ksl_it_init(it, ksl, blk, i);
+      }
+      return 0;
+    }
+
+    if (i == blk->n) {
+      /* This insertion extends the largest key in this subtree. */
+      for (; !blk->leaf;) {
+        node = nghttp2_ksl_nth_node(ksl, blk, blk->n - 1);
+        if (node->blk->n == NGHTTP2_KSL_MAX_NBLK) {
+          rv = ksl_split_node(ksl, blk, blk->n - 1);
+          if (rv != 0) {
+            return rv;
+          }
+          node = nghttp2_ksl_nth_node(ksl, blk, blk->n - 1);
+        }
+        ksl_node_set_key(ksl, node, key);
+        blk = node->blk;
+      }
+      ksl_insert_node(ksl, blk, blk->n, key, data);
+      ++ksl->n;
+      if (it) {
+        nghttp2_ksl_it_init(it, ksl, blk, blk->n - 1);
+      }
+      return 0;
+    }
+
+    node = nghttp2_ksl_nth_node(ksl, blk, i);
+
+    if (node->blk->n == NGHTTP2_KSL_MAX_NBLK) {
+      rv = ksl_split_node(ksl, blk, i);
+      if (rv != 0) {
+        return rv;
+      }
+      if (ksl->compar((nghttp2_ksl_key *)node->key, key)) {
+        node = nghttp2_ksl_nth_node(ksl, blk, i + 1);
+        if (ksl->compar((nghttp2_ksl_key *)node->key, key)) {
+          ksl_node_set_key(ksl, node, key);
+        }
+      }
+    }
+
+    blk = node->blk;
+  }
+}
+
+/*
+ * ksl_remove_node removes the node included in |blk| at the index of
+ * |i|.
+ */
+static void ksl_remove_node(nghttp2_ksl *ksl, nghttp2_ksl_blk *blk, size_t i) {
+  memmove(blk->nodes + i * ksl->nodelen, blk->nodes + (i + 1) * ksl->nodelen,
+          ksl->nodelen * (blk->n - (i + 1)));
+
+  --blk->n;
+}
+
+/*
+ * ksl_merge_node merges 2 nodes which are the nodes at the index of
+ * |i| and |i + 1|.
+ *
+ * If |blk| is the direct descendant of head (root) block and the head
+ * block contains just 2 nodes, the merged block becomes head block,
+ * which decreases the height of |ksl| by 1.
+ *
+ * This function returns the pointer to the merged block.
+ */
+static nghttp2_ksl_blk *ksl_merge_node(nghttp2_ksl *ksl, nghttp2_ksl_blk *blk,
+                                       size_t i) {
+  nghttp2_ksl_blk *lblk, *rblk;
+
+  assert(i + 1 < blk->n);
+
+  lblk = nghttp2_ksl_nth_node(ksl, blk, i)->blk;
+  rblk = nghttp2_ksl_nth_node(ksl, blk, i + 1)->blk;
+
+  assert(lblk->n + rblk->n < NGHTTP2_KSL_MAX_NBLK);
+
+  memcpy(lblk->nodes + ksl->nodelen * lblk->n, rblk->nodes,
+         ksl->nodelen * rblk->n);
+
+  lblk->n += rblk->n;
+  lblk->next = rblk->next;
+  if (lblk->next) {
+    lblk->next->prev = lblk;
+  } else if (ksl->back == rblk) {
+    ksl->back = lblk;
+  }
+
+  nghttp2_mem_free(ksl->mem, rblk);
+
+  if (ksl->head == blk && blk->n == 2) {
+    nghttp2_mem_free(ksl->mem, ksl->head);
+    ksl->head = lblk;
+  } else {
+    ksl_remove_node(ksl, blk, i + 1);
+    ksl_node_set_key(ksl, nghttp2_ksl_nth_node(ksl, blk, i),
+                     nghttp2_ksl_nth_node(ksl, lblk, lblk->n - 1)->key);
+  }
+
+  return lblk;
+}
+
+/*
+ * ksl_shift_left moves the first node in blk->nodes[i]->blk->nodes to
+ * blk->nodes[i - 1]->blk->nodes.
+ */
+static void ksl_shift_left(nghttp2_ksl *ksl, nghttp2_ksl_blk *blk, size_t i) {
+  nghttp2_ksl_node *lnode, *rnode, *dest, *src;
+
+  assert(i > 0);
+
+  lnode = nghttp2_ksl_nth_node(ksl, blk, i - 1);
+  rnode = nghttp2_ksl_nth_node(ksl, blk, i);
+
+  assert(lnode->blk->n < NGHTTP2_KSL_MAX_NBLK);
+  assert(rnode->blk->n > NGHTTP2_KSL_MIN_NBLK);
+
+  dest = nghttp2_ksl_nth_node(ksl, lnode->blk, lnode->blk->n);
+  src = nghttp2_ksl_nth_node(ksl, rnode->blk, 0);
+
+  memcpy(dest, src, ksl->nodelen);
+  ksl_node_set_key(ksl, lnode, dest->key);
+  ++lnode->blk->n;
+
+  --rnode->blk->n;
+  memmove(rnode->blk->nodes, rnode->blk->nodes + ksl->nodelen,
+          ksl->nodelen * rnode->blk->n);
+}
+
+/*
+ * ksl_shift_right moves the last node in blk->nodes[i]->blk->nodes to
+ * blk->nodes[i + 1]->blk->nodes.
+ */
+static void ksl_shift_right(nghttp2_ksl *ksl, nghttp2_ksl_blk *blk, size_t i) {
+  nghttp2_ksl_node *lnode, *rnode, *dest, *src;
+
+  assert(i < blk->n - 1);
+
+  lnode = nghttp2_ksl_nth_node(ksl, blk, i);
+  rnode = nghttp2_ksl_nth_node(ksl, blk, i + 1);
+
+  assert(lnode->blk->n > NGHTTP2_KSL_MIN_NBLK);
+  assert(rnode->blk->n < NGHTTP2_KSL_MAX_NBLK);
+
+  memmove(rnode->blk->nodes + ksl->nodelen, rnode->blk->nodes,
+          ksl->nodelen * rnode->blk->n);
+  ++rnode->blk->n;
+
+  dest = nghttp2_ksl_nth_node(ksl, rnode->blk, 0);
+  src = nghttp2_ksl_nth_node(ksl, lnode->blk, lnode->blk->n - 1);
+
+  memcpy(dest, src, ksl->nodelen);
+
+  --lnode->blk->n;
+  ksl_node_set_key(
+      ksl, lnode,
+      nghttp2_ksl_nth_node(ksl, lnode->blk, lnode->blk->n - 1)->key);
+}
+
+/*
+ * key_equal returns nonzero if |lhs| and |rhs| are equal using the
+ * function |compar|.
+ */
+static int key_equal(nghttp2_ksl_compar compar, const nghttp2_ksl_key *lhs,
+                     const nghttp2_ksl_key *rhs) {
+  return !compar(lhs, rhs) && !compar(rhs, lhs);
+}
+
+int nghttp2_ksl_remove(nghttp2_ksl *ksl, nghttp2_ksl_it *it,
+                       const nghttp2_ksl_key *key) {
+  nghttp2_ksl_blk *blk = ksl->head;
+  nghttp2_ksl_node *node;
+  size_t i;
+
+  if (!blk->leaf && blk->n == 2 &&
+      nghttp2_ksl_nth_node(ksl, blk, 0)->blk->n == NGHTTP2_KSL_MIN_NBLK &&
+      nghttp2_ksl_nth_node(ksl, blk, 1)->blk->n == NGHTTP2_KSL_MIN_NBLK) {
+    blk = ksl_merge_node(ksl, ksl->head, 0);
+  }
+
+  for (;;) {
+    i = ksl_bsearch(ksl, blk, key, ksl->compar);
+
+    if (i == blk->n) {
+      if (it) {
+        *it = nghttp2_ksl_end(ksl);
+      }
+      return NGHTTP2_ERR_INVALID_ARGUMENT;
+    }
+
+    if (blk->leaf) {
+      if (ksl->compar(key, nghttp2_ksl_nth_node(ksl, blk, i)->key)) {
+        if (it) {
+          *it = nghttp2_ksl_end(ksl);
+        }
+        return NGHTTP2_ERR_INVALID_ARGUMENT;
+      }
+      ksl_remove_node(ksl, blk, i);
+      --ksl->n;
+      if (it) {
+        if (blk->n == i && blk->next) {
+          nghttp2_ksl_it_init(it, ksl, blk->next, 0);
+        } else {
+          nghttp2_ksl_it_init(it, ksl, blk, i);
+        }
+      }
+      return 0;
+    }
+
+    node = nghttp2_ksl_nth_node(ksl, blk, i);
+
+    if (node->blk->n == NGHTTP2_KSL_MIN_NBLK) {
+      if (i > 0 && nghttp2_ksl_nth_node(ksl, blk, i - 1)->blk->n >
+                       NGHTTP2_KSL_MIN_NBLK) {
+        ksl_shift_right(ksl, blk, i - 1);
+        blk = node->blk;
+      } else if (i + 1 < blk->n &&
+                 nghttp2_ksl_nth_node(ksl, blk, i + 1)->blk->n >
+                     NGHTTP2_KSL_MIN_NBLK) {
+        ksl_shift_left(ksl, blk, i + 1);
+        blk = node->blk;
+      } else if (i > 0) {
+        blk = ksl_merge_node(ksl, blk, i - 1);
+      } else {
+        assert(i + 1 < blk->n);
+        blk = ksl_merge_node(ksl, blk, i);
+      }
+    } else {
+      blk = node->blk;
+    }
+  }
+}
+
+nghttp2_ksl_it nghttp2_ksl_lower_bound(nghttp2_ksl *ksl,
+                                       const nghttp2_ksl_key *key) {
+  nghttp2_ksl_blk *blk = ksl->head;
+  nghttp2_ksl_it it;
+  size_t i;
+
+  for (;;) {
+    i = ksl_bsearch(ksl, blk, key, ksl->compar);
+
+    if (blk->leaf) {
+      if (i == blk->n && blk->next) {
+        blk = blk->next;
+        i = 0;
+      }
+      nghttp2_ksl_it_init(&it, ksl, blk, i);
+      return it;
+    }
+
+    if (i == blk->n) {
+      /* This happens if descendant has smaller key.  Fast forward to
+         find last node in this subtree. */
+      for (; !blk->leaf; blk = nghttp2_ksl_nth_node(ksl, blk, blk->n - 1)->blk)
+        ;
+      if (blk->next) {
+        blk = blk->next;
+        i = 0;
+      } else {
+        i = blk->n;
+      }
+      nghttp2_ksl_it_init(&it, ksl, blk, i);
+      return it;
+    }
+    blk = nghttp2_ksl_nth_node(ksl, blk, i)->blk;
+  }
+}
+
+nghttp2_ksl_it nghttp2_ksl_lower_bound_compar(nghttp2_ksl *ksl,
+                                              const nghttp2_ksl_key *key,
+                                              nghttp2_ksl_compar compar) {
+  nghttp2_ksl_blk *blk = ksl->head;
+  nghttp2_ksl_it it;
+  size_t i;
+
+  for (;;) {
+    i = ksl_bsearch(ksl, blk, key, compar);
+
+    if (blk->leaf) {
+      if (i == blk->n && blk->next) {
+        blk = blk->next;
+        i = 0;
+      }
+      nghttp2_ksl_it_init(&it, ksl, blk, i);
+      return it;
+    }
+
+    if (i == blk->n) {
+      /* This happens if descendant has smaller key.  Fast forward to
+         find last node in this subtree. */
+      for (; !blk->leaf; blk = nghttp2_ksl_nth_node(ksl, blk, blk->n - 1)->blk)
+        ;
+      if (blk->next) {
+        blk = blk->next;
+        i = 0;
+      } else {
+        i = blk->n;
+      }
+      nghttp2_ksl_it_init(&it, ksl, blk, i);
+      return it;
+    }
+    blk = nghttp2_ksl_nth_node(ksl, blk, i)->blk;
+  }
+}
+
+void nghttp2_ksl_update_key(nghttp2_ksl *ksl, const nghttp2_ksl_key *old_key,
+                            const nghttp2_ksl_key *new_key) {
+  nghttp2_ksl_blk *blk = ksl->head;
+  nghttp2_ksl_node *node;
+  size_t i;
+
+  for (;;) {
+    i = ksl_bsearch(ksl, blk, old_key, ksl->compar);
+
+    assert(i < blk->n);
+    node = nghttp2_ksl_nth_node(ksl, blk, i);
+
+    if (blk->leaf) {
+      assert(key_equal(ksl->compar, (nghttp2_ksl_key *)node->key, old_key));
+      ksl_node_set_key(ksl, node, new_key);
+      return;
+    }
+
+    if (key_equal(ksl->compar, (nghttp2_ksl_key *)node->key, old_key) ||
+        ksl->compar((nghttp2_ksl_key *)node->key, new_key)) {
+      ksl_node_set_key(ksl, node, new_key);
+    }
+
+    blk = node->blk;
+  }
+}
+
+static void ksl_print(nghttp2_ksl *ksl, nghttp2_ksl_blk *blk, size_t level) {
+  size_t i;
+  nghttp2_ksl_node *node;
+
+  fprintf(stderr, "LV=%zu n=%zu\n", level, blk->n);
+
+  if (blk->leaf) {
+    for (i = 0; i < blk->n; ++i) {
+      node = nghttp2_ksl_nth_node(ksl, blk, i);
+      fprintf(stderr, " %" PRId64, *(int64_t *)(void *)node->key);
+    }
+    fprintf(stderr, "\n");
+    return;
+  }
+
+  for (i = 0; i < blk->n; ++i) {
+    ksl_print(ksl, nghttp2_ksl_nth_node(ksl, blk, i)->blk, level + 1);
+  }
+}
+
+size_t nghttp2_ksl_len(nghttp2_ksl *ksl) { return ksl->n; }
+
+void nghttp2_ksl_clear(nghttp2_ksl *ksl) {
+  size_t i;
+  nghttp2_ksl_blk *head;
+
+  if (!ksl->head->leaf) {
+    for (i = 0; i < ksl->head->n; ++i) {
+      ksl_free_blk(ksl, nghttp2_ksl_nth_node(ksl, ksl->head, i)->blk);
+    }
+  }
+
+  ksl->front = ksl->back = ksl->head;
+  ksl->n = 0;
+
+  head = ksl->head;
+
+  head->next = head->prev = NULL;
+  head->n = 0;
+  head->leaf = 1;
+}
+
+void nghttp2_ksl_print(nghttp2_ksl *ksl) { ksl_print(ksl, ksl->head, 0); }
+
+nghttp2_ksl_it nghttp2_ksl_begin(const nghttp2_ksl *ksl) {
+  nghttp2_ksl_it it;
+  nghttp2_ksl_it_init(&it, ksl, ksl->front, 0);
+  return it;
+}
+
+nghttp2_ksl_it nghttp2_ksl_end(const nghttp2_ksl *ksl) {
+  nghttp2_ksl_it it;
+  nghttp2_ksl_it_init(&it, ksl, ksl->back, ksl->back->n);
+  return it;
+}
+
+void nghttp2_ksl_it_init(nghttp2_ksl_it *it, const nghttp2_ksl *ksl,
+                         nghttp2_ksl_blk *blk, size_t i) {
+  it->ksl = ksl;
+  it->blk = blk;
+  it->i = i;
+}
+
+void *nghttp2_ksl_it_get(const nghttp2_ksl_it *it) {
+  assert(it->i < it->blk->n);
+  return nghttp2_ksl_nth_node(it->ksl, it->blk, it->i)->data;
+}
+
+void nghttp2_ksl_it_prev(nghttp2_ksl_it *it) {
+  assert(!nghttp2_ksl_it_begin(it));
+
+  if (it->i == 0) {
+    it->blk = it->blk->prev;
+    it->i = it->blk->n - 1;
+  } else {
+    --it->i;
+  }
+}
+
+int nghttp2_ksl_it_begin(const nghttp2_ksl_it *it) {
+  return it->i == 0 && it->blk->prev == NULL;
+}
diff --git a/deps/nghttp2/lib/nghttp2_ksl.h b/deps/nghttp2/lib/nghttp2_ksl.h
new file mode 100644
index 00000000000..39d900ffbf5
--- /dev/null
+++ b/deps/nghttp2/lib/nghttp2_ksl.h
@@ -0,0 +1,315 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2020 nghttp2 contributors
+ * Copyright (c) 2018 ngtcp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef NGHTTP2_KSL_H
+#define NGHTTP2_KSL_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <stdlib.h>
+
+#include <nghttp2/nghttp2.h>
+
+/*
+ * Skip List using single key instead of range.
+ */
+
+#define NGHTTP2_KSL_DEGR 16
+/* NGHTTP2_KSL_MAX_NBLK is the maximum number of nodes which a single
+   block can contain. */
+#define NGHTTP2_KSL_MAX_NBLK (2 * NGHTTP2_KSL_DEGR - 1)
+/* NGHTTP2_KSL_MIN_NBLK is the minimum number of nodes which a single
+   block other than root must contains. */
+#define NGHTTP2_KSL_MIN_NBLK (NGHTTP2_KSL_DEGR - 1)
+
+/*
+ * nghttp2_ksl_key represents key in nghttp2_ksl.
+ */
+typedef void nghttp2_ksl_key;
+
+struct nghttp2_ksl_node;
+typedef struct nghttp2_ksl_node nghttp2_ksl_node;
+
+struct nghttp2_ksl_blk;
+typedef struct nghttp2_ksl_blk nghttp2_ksl_blk;
+
+/*
+ * nghttp2_ksl_node is a node which contains either nghttp2_ksl_blk or
+ * opaque data.  If a node is an internal node, it contains
+ * nghttp2_ksl_blk.  Otherwise, it has data.  The key is stored at the
+ * location starting at key.
+ */
+struct nghttp2_ksl_node {
+  union {
+    nghttp2_ksl_blk *blk;
+    void *data;
+  };
+  union {
+    uint64_t align;
+    /* key is a buffer to include key associated to this node.
+       Because the length of key is unknown until nghttp2_ksl_init is
+       called, the actual buffer will be allocated after this
+       field. */
+    uint8_t key[1];
+  };
+};
+
+/*
+ * nghttp2_ksl_blk contains nghttp2_ksl_node objects.
+ */
+struct nghttp2_ksl_blk {
+  /* next points to the next block if leaf field is nonzero. */
+  nghttp2_ksl_blk *next;
+  /* prev points to the previous block if leaf field is nonzero. */
+  nghttp2_ksl_blk *prev;
+  /* n is the number of nodes this object contains in nodes. */
+  size_t n;
+  /* leaf is nonzero if this block contains leaf nodes. */
+  int leaf;
+  union {
+    uint64_t align;
+    /* nodes is a buffer to contain NGHTTP2_KSL_MAX_NBLK
+       nghttp2_ksl_node objects.  Because nghttp2_ksl_node object is
+       allocated along with the additional variable length key
+       storage, the size of buffer is unknown until nghttp2_ksl_init is
+       called. */
+    uint8_t nodes[1];
+  };
+};
+
+/*
+ * nghttp2_ksl_compar is a function type which returns nonzero if key
+ * |lhs| should be placed before |rhs|.  It returns 0 otherwise.
+ */
+typedef int (*nghttp2_ksl_compar)(const nghttp2_ksl_key *lhs,
+                                  const nghttp2_ksl_key *rhs);
+
+struct nghttp2_ksl;
+typedef struct nghttp2_ksl nghttp2_ksl;
+
+struct nghttp2_ksl_it;
+typedef struct nghttp2_ksl_it nghttp2_ksl_it;
+
+/*
+ * nghttp2_ksl_it is a forward iterator to iterate nodes.
+ */
+struct nghttp2_ksl_it {
+  const nghttp2_ksl *ksl;
+  nghttp2_ksl_blk *blk;
+  size_t i;
+};
+
+/*
+ * nghttp2_ksl is a deterministic paged skip list.
+ */
+struct nghttp2_ksl {
+  /* head points to the root block. */
+  nghttp2_ksl_blk *head;
+  /* front points to the first leaf block. */
+  nghttp2_ksl_blk *front;
+  /* back points to the last leaf block. */
+  nghttp2_ksl_blk *back;
+  nghttp2_ksl_compar compar;
+  size_t n;
+  /* keylen is the size of key */
+  size_t keylen;
+  /* nodelen is the actual size of nghttp2_ksl_node including key
+     storage. */
+  size_t nodelen;
+  nghttp2_mem *mem;
+};
+
+/*
+ * nghttp2_ksl_init initializes |ksl|.  |compar| specifies compare
+ * function.  |keylen| is the length of key.
+ *
+ * It returns 0 if it succeeds, or one of the following negative error
+ * codes:
+ *
+ * NGHTTP2_ERR_NOMEM
+ *   Out of memory.
+ */
+int nghttp2_ksl_init(nghttp2_ksl *ksl, nghttp2_ksl_compar compar, size_t keylen,
+                     nghttp2_mem *mem);
+
+/*
+ * nghttp2_ksl_free frees resources allocated for |ksl|.  If |ksl| is
+ * NULL, this function does nothing.  It does not free the memory
+ * region pointed by |ksl| itself.
+ */
+void nghttp2_ksl_free(nghttp2_ksl *ksl);
+
+/*
+ * nghttp2_ksl_insert inserts |key| with its associated |data|.  On
+ * successful insertion, the iterator points to the inserted node is
+ * stored in |*it|.
+ *
+ * This function returns 0 if it succeeds, or one of the following
+ * negative error codes:
+ *
+ * NGHTTP2_ERR_NOMEM
+ *   Out of memory.
+ * NGHTTP2_ERR_INVALID_ARGUMENT
+ *   |key| already exists.
+ */
+int nghttp2_ksl_insert(nghttp2_ksl *ksl, nghttp2_ksl_it *it,
+                       const nghttp2_ksl_key *key, void *data);
+
+/*
+ * nghttp2_ksl_remove removes the |key| from |ksl|.
+ *
+ * This function assigns the iterator to |*it|, which points to the
+ * node which is located at the right next of the removed node if |it|
+ * is not NULL.  If |key| is not found, no deletion takes place and
+ * the return value of nghttp2_ksl_end(ksl) is assigned to |*it|.
+ *
+ * This function returns 0 if it succeeds, or one of the following
+ * negative error codes:
+ *
+ * NGHTTP2_ERR_INVALID_ARGUMENT
+ *   |key| does not exist.
+ */
+int nghttp2_ksl_remove(nghttp2_ksl *ksl, nghttp2_ksl_it *it,
+                       const nghttp2_ksl_key *key);
+
+/*
+ * nghttp2_ksl_lower_bound returns the iterator which points to the
+ * first node which has the key which is equal to |key| or the last
+ * node which satisfies !compar(&node->key, key).  If there is no such
+ * node, it returns the iterator which satisfies nghttp2_ksl_it_end(it)
+ * != 0.
+ */
+nghttp2_ksl_it nghttp2_ksl_lower_bound(nghttp2_ksl *ksl,
+                                       const nghttp2_ksl_key *key);
+
+/*
+ * nghttp2_ksl_lower_bound_compar works like nghttp2_ksl_lower_bound,
+ * but it takes custom function |compar| to do lower bound search.
+ */
+nghttp2_ksl_it nghttp2_ksl_lower_bound_compar(nghttp2_ksl *ksl,
+                                              const nghttp2_ksl_key *key,
+                                              nghttp2_ksl_compar compar);
+
+/*
+ * nghttp2_ksl_update_key replaces the key of nodes which has |old_key|
+ * with |new_key|.  |new_key| must be strictly greater than the
+ * previous node and strictly smaller than the next node.
+ */
+void nghttp2_ksl_update_key(nghttp2_ksl *ksl, const nghttp2_ksl_key *old_key,
+                            const nghttp2_ksl_key *new_key);
+
+/*
+ * nghttp2_ksl_begin returns the iterator which points to the first
+ * node.  If there is no node in |ksl|, it returns the iterator which
+ * satisfies nghttp2_ksl_it_end(it) != 0.
+ */
+nghttp2_ksl_it nghttp2_ksl_begin(const nghttp2_ksl *ksl);
+
+/*
+ * nghttp2_ksl_end returns the iterator which points to the node
+ * following the last node.  The returned object satisfies
+ * nghttp2_ksl_it_end().  If there is no node in |ksl|, it returns the
+ * iterator which satisfies nghttp2_ksl_it_begin(it) != 0.
+ */
+nghttp2_ksl_it nghttp2_ksl_end(const nghttp2_ksl *ksl);
+
+/*
+ * nghttp2_ksl_len returns the number of elements stored in |ksl|.
+ */
+size_t nghttp2_ksl_len(nghttp2_ksl *ksl);
+
+/*
+ * nghttp2_ksl_clear removes all elements stored in |ksl|.
+ */
+void nghttp2_ksl_clear(nghttp2_ksl *ksl);
+
+/*
+ * nghttp2_ksl_nth_node returns the |n|th node under |blk|.
+ */
+#define nghttp2_ksl_nth_node(KSL, BLK, N)                                      \
+  ((nghttp2_ksl_node *)(void *)((BLK)->nodes + (KSL)->nodelen * (N)))
+
+/*
+ * nghttp2_ksl_print prints its internal state in stderr.  It assumes
+ * that the key is of type int64_t.  This function should be used for
+ * the debugging purpose only.
+ */
+void nghttp2_ksl_print(nghttp2_ksl *ksl);
+
+/*
+ * nghttp2_ksl_it_init initializes |it|.
+ */
+void nghttp2_ksl_it_init(nghttp2_ksl_it *it, const nghttp2_ksl *ksl,
+                         nghttp2_ksl_blk *blk, size_t i);
+
+/*
+ * nghttp2_ksl_it_get returns the data associated to the node which
+ * |it| points to.  It is undefined to call this function when
+ * nghttp2_ksl_it_end(it) returns nonzero.
+ */
+void *nghttp2_ksl_it_get(const nghttp2_ksl_it *it);
+
+/*
+ * nghttp2_ksl_it_next advances the iterator by one.  It is undefined
+ * if this function is called when nghttp2_ksl_it_end(it) returns
+ * nonzero.
+ */
+#define nghttp2_ksl_it_next(IT)                                                \
+  (++(IT)->i == (IT)->blk->n && (IT)->blk->next                                \
+       ? ((IT)->blk = (IT)->blk->next, (IT)->i = 0)                            \
+       : 0)
+
+/*
+ * nghttp2_ksl_it_prev moves backward the iterator by one.  It is
+ * undefined if this function is called when nghttp2_ksl_it_begin(it)
+ * returns nonzero.
+ */
+void nghttp2_ksl_it_prev(nghttp2_ksl_it *it);
+
+/*
+ * nghttp2_ksl_it_end returns nonzero if |it| points to the beyond the
+ * last node.
+ */
+#define nghttp2_ksl_it_end(IT)                                                 \
+  ((IT)->blk->n == (IT)->i && (IT)->blk->next == NULL)
+
+/*
+ * nghttp2_ksl_it_begin returns nonzero if |it| points to the first
+ * node.  |it| might satisfy both nghttp2_ksl_it_begin(&it) and
+ * nghttp2_ksl_it_end(&it) if the skip list has no node.
+ */
+int nghttp2_ksl_it_begin(const nghttp2_ksl_it *it);
+
+/*
+ * nghttp2_ksl_key returns the key of the node which |it| points to.
+ * It is undefined to call this function when nghttp2_ksl_it_end(it)
+ * returns nonzero.
+ */
+#define nghttp2_ksl_it_key(IT)                                                 \
+  ((nghttp2_ksl_key *)nghttp2_ksl_nth_node((IT)->ksl, (IT)->blk, (IT)->i)->key)
+
+#endif /* NGHTTP2_KSL_H */
diff --git a/deps/nghttp2/lib/nghttp2_map.c b/deps/nghttp2/lib/nghttp2_map.c
index 4d9f97b47e2..d12a1f4757b 100644
--- a/deps/nghttp2/lib/nghttp2_map.c
+++ b/deps/nghttp2/lib/nghttp2_map.c
@@ -1,7 +1,8 @@
 /*
  * nghttp2 - HTTP/2 C Library
  *
- * Copyright (c) 2012 Tatsuhiro Tsujikawa
+ * Copyright (c) 2017 ngtcp2 contributors
+ * Copyright (c) 2012 nghttp2 contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
@@ -25,6 +26,9 @@
 #include "nghttp2_map.h"
 
 #include <string.h>
+#include <assert.h>
+
+#include "nghttp2_helper.h"
 
 #define INITIAL_TABLE_LENGTH 256
 
@@ -32,7 +36,7 @@ int nghttp2_map_init(nghttp2_map *map, nghttp2_mem *mem) {
   map->mem = mem;
   map->tablelen = INITIAL_TABLE_LENGTH;
   map->table =
-      nghttp2_mem_calloc(mem, map->tablelen, sizeof(nghttp2_map_entry *));
+      nghttp2_mem_calloc(mem, map->tablelen, sizeof(nghttp2_map_bucket));
   if (map->table == NULL) {
     return NGHTTP2_ERR_NOMEM;
   }
@@ -43,6 +47,21 @@ int nghttp2_map_init(nghttp2_map *map, nghttp2_mem *mem) {
 }
 
 void nghttp2_map_free(nghttp2_map *map) {
+  size_t i;
+  nghttp2_map_bucket *bkt;
+
+  if (!map) {
+    return;
+  }
+
+  for (i = 0; i < map->tablelen; ++i) {
+    bkt = &map->table[i];
+    if (bkt->ksl) {
+      nghttp2_ksl_free(bkt->ksl);
+      nghttp2_mem_free(map->mem, bkt->ksl);
+    }
+  }
+
   nghttp2_mem_free(map->mem, map->table);
 }
 
@@ -50,14 +69,29 @@ void nghttp2_map_each_free(nghttp2_map *map,
                            int (*func)(nghttp2_map_entry *entry, void *ptr),
                            void *ptr) {
   uint32_t i;
+  nghttp2_map_bucket *bkt;
+  nghttp2_ksl_it it;
+
   for (i = 0; i < map->tablelen; ++i) {
-    nghttp2_map_entry *entry;
-    for (entry = map->table[i]; entry;) {
-      nghttp2_map_entry *next = entry->next;
-      func(entry, ptr);
-      entry = next;
+    bkt = &map->table[i];
+
+    if (bkt->ptr) {
+      func(bkt->ptr, ptr);
+      bkt->ptr = NULL;
+      assert(bkt->ksl == NULL || nghttp2_ksl_len(bkt->ksl) == 0);
+      continue;
+    }
+
+    if (bkt->ksl) {
+      for (it = nghttp2_ksl_begin(bkt->ksl); !nghttp2_ksl_it_end(&it);
+           nghttp2_ksl_it_next(&it)) {
+        func(nghttp2_ksl_it_get(&it), ptr);
+      }
+
+      nghttp2_ksl_free(bkt->ksl);
+      nghttp2_mem_free(map->mem, bkt->ksl);
+      bkt->ksl = NULL;
     }
-    map->table[i] = NULL;
   }
 }
 
@@ -66,13 +100,29 @@ int nghttp2_map_each(nghttp2_map *map,
                      void *ptr) {
   int rv;
   uint32_t i;
+  nghttp2_map_bucket *bkt;
+  nghttp2_ksl_it it;
+
   for (i = 0; i < map->tablelen; ++i) {
-    nghttp2_map_entry *entry;
-    for (entry = map->table[i]; entry; entry = entry->next) {
-      rv = func(entry, ptr);
+    bkt = &map->table[i];
+
+    if (bkt->ptr) {
+      rv = func(bkt->ptr, ptr);
       if (rv != 0) {
         return rv;
       }
+      assert(bkt->ksl == NULL || nghttp2_ksl_len(bkt->ksl) == 0);
+      continue;
+    }
+
+    if (bkt->ksl) {
+      for (it = nghttp2_ksl_begin(bkt->ksl); !nghttp2_ksl_it_end(&it);
+           nghttp2_ksl_it_next(&it)) {
+        rv = func(nghttp2_ksl_it_get(&it), ptr);
+        if (rv != 0) {
+          return rv;
+        }
+      }
     }
   }
   return 0;
@@ -83,72 +133,133 @@ void nghttp2_map_entry_init(nghttp2_map_entry *entry, key_type key) {
   entry->next = NULL;
 }
 
-/* Same hash function in android HashMap source code. */
-/* The |mod| must be power of 2 */
-static uint32_t hash(int32_t key, uint32_t mod) {
-  uint32_t h = (uint32_t)key;
-  h ^= (h >> 20) ^ (h >> 12);
-  h ^= (h >> 7) ^ (h >> 4);
+/* FNV1a hash */
+static uint32_t hash(key_type key, uint32_t mod) {
+  uint8_t *p, *end;
+  uint32_t h = 0x811C9DC5u;
+
+  p = (uint8_t *)&key;
+  end = p + sizeof(key_type);
+
+  for (; p != end;) {
+    h ^= *p++;
+    h += (h << 1) + (h << 4) + (h << 7) + (h << 8) + (h << 24);
+  }
+
   return h & (mod - 1);
 }
 
-static int insert(nghttp2_map_entry **table, uint32_t tablelen,
-                  nghttp2_map_entry *entry) {
+static int less(const nghttp2_ksl_key *lhs, const nghttp2_ksl_key *rhs) {
+  return *(key_type *)lhs < *(key_type *)rhs;
+}
+
+static int map_insert(nghttp2_map *map, nghttp2_map_bucket *table,
+                      uint32_t tablelen, nghttp2_map_entry *entry) {
   uint32_t h = hash(entry->key, tablelen);
-  if (table[h] == NULL) {
-    table[h] = entry;
-  } else {
-    nghttp2_map_entry *p;
-    /* We won't allow duplicated key, so check it out. */
-    for (p = table[h]; p; p = p->next) {
-      if (p->key == entry->key) {
-        return NGHTTP2_ERR_INVALID_ARGUMENT;
-      }
+  nghttp2_map_bucket *bkt = &table[h];
+  nghttp2_mem *mem = map->mem;
+  int rv;
+
+  if (bkt->ptr == NULL &&
+      (bkt->ksl == NULL || nghttp2_ksl_len(bkt->ksl) == 0)) {
+    bkt->ptr = entry;
+    return 0;
+  }
+
+  if (!bkt->ksl) {
+    bkt->ksl = nghttp2_mem_malloc(mem, sizeof(*bkt->ksl));
+    if (bkt->ksl == NULL) {
+      return NGHTTP2_ERR_NOMEM;
     }
-    entry->next = table[h];
-    table[h] = entry;
+    nghttp2_ksl_init(bkt->ksl, less, sizeof(key_type), mem);
   }
-  return 0;
+
+  if (bkt->ptr) {
+    rv = nghttp2_ksl_insert(bkt->ksl, NULL, &bkt->ptr->key, bkt->ptr);
+    if (rv != 0) {
+      return rv;
+    }
+
+    bkt->ptr = NULL;
+  }
+
+  return nghttp2_ksl_insert(bkt->ksl, NULL, &entry->key, entry);
 }
 
 /* new_tablelen must be power of 2 */
-static int resize(nghttp2_map *map, uint32_t new_tablelen) {
+static int map_resize(nghttp2_map *map, uint32_t new_tablelen) {
   uint32_t i;
-  nghttp2_map_entry **new_table;
+  nghttp2_map_bucket *new_table;
+  nghttp2_map_bucket *bkt;
+  nghttp2_ksl_it it;
+  int rv;
 
   new_table =
-      nghttp2_mem_calloc(map->mem, new_tablelen, sizeof(nghttp2_map_entry *));
+      nghttp2_mem_calloc(map->mem, new_tablelen, sizeof(nghttp2_map_bucket));
   if (new_table == NULL) {
     return NGHTTP2_ERR_NOMEM;
   }
 
   for (i = 0; i < map->tablelen; ++i) {
-    nghttp2_map_entry *entry;
-    for (entry = map->table[i]; entry;) {
-      nghttp2_map_entry *next = entry->next;
-      entry->next = NULL;
-      /* This function must succeed */
-      insert(new_table, new_tablelen, entry);
-      entry = next;
+    bkt = &map->table[i];
+
+    if (bkt->ptr) {
+      rv = map_insert(map, new_table, new_tablelen, bkt->ptr);
+      if (rv != 0) {
+        goto fail;
+      }
+      assert(bkt->ksl == NULL || nghttp2_ksl_len(bkt->ksl) == 0);
+      continue;
+    }
+
+    if (bkt->ksl) {
+      for (it = nghttp2_ksl_begin(bkt->ksl); !nghttp2_ksl_it_end(&it);
+           nghttp2_ksl_it_next(&it)) {
+        rv = map_insert(map, new_table, new_tablelen, nghttp2_ksl_it_get(&it));
+        if (rv != 0) {
+          goto fail;
+        }
+      }
+    }
+  }
+
+  for (i = 0; i < map->tablelen; ++i) {
+    bkt = &map->table[i];
+    if (bkt->ksl) {
+      nghttp2_ksl_free(bkt->ksl);
+      nghttp2_mem_free(map->mem, bkt->ksl);
     }
   }
+
   nghttp2_mem_free(map->mem, map->table);
   map->tablelen = new_tablelen;
   map->table = new_table;
 
   return 0;
+
+fail:
+  for (i = 0; i < new_tablelen; ++i) {
+    bkt = &new_table[i];
+    if (bkt->ksl) {
+      nghttp2_ksl_free(bkt->ksl);
+      nghttp2_mem_free(map->mem, bkt->ksl);
+    }
+  }
+
+  return rv;
 }
 
 int nghttp2_map_insert(nghttp2_map *map, nghttp2_map_entry *new_entry) {
   int rv;
+
   /* Load factor is 0.75 */
   if ((map->size + 1) * 4 > map->tablelen * 3) {
-    rv = resize(map, map->tablelen * 2);
+    rv = map_resize(map, map->tablelen * 2);
     if (rv != 0) {
       return rv;
     }
   }
-  rv = insert(map->table, map->tablelen, new_entry);
+  rv = map_insert(map, map->table, map->tablelen, new_entry);
   if (rv != 0) {
     return rv;
   }
@@ -157,33 +268,68 @@ int nghttp2_map_insert(nghttp2_map *map, nghttp2_map_entry *new_entry) {
 }
 
 nghttp2_map_entry *nghttp2_map_find(nghttp2_map *map, key_type key) {
-  uint32_t h;
-  nghttp2_map_entry *entry;
-  h = hash(key, map->tablelen);
-  for (entry = map->table[h]; entry; entry = entry->next) {
-    if (entry->key == key) {
-      return entry;
+  nghttp2_map_bucket *bkt = &map->table[hash(key, map->tablelen)];
+  nghttp2_ksl_it it;
+
+  if (bkt->ptr) {
+    if (bkt->ptr->key == key) {
+      return bkt->ptr;
+    }
+    return NULL;
+  }
+
+  if (bkt->ksl) {
+    it = nghttp2_ksl_lower_bound(bkt->ksl, &key);
+    if (nghttp2_ksl_it_end(&it) ||
+        *(key_type *)nghttp2_ksl_it_key(&it) != key) {
+      return NULL;
     }
+    return nghttp2_ksl_it_get(&it);
   }
+
   return NULL;
 }
 
 int nghttp2_map_remove(nghttp2_map *map, key_type key) {
-  uint32_t h;
-  nghttp2_map_entry **dst;
-
-  h = hash(key, map->tablelen);
+  nghttp2_map_bucket *bkt = &map->table[hash(key, map->tablelen)];
+  int rv;
 
-  for (dst = &map->table[h]; *dst; dst = &(*dst)->next) {
-    if ((*dst)->key != key) {
-      continue;
+  if (bkt->ptr) {
+    if (bkt->ptr->key == key) {
+      bkt->ptr = NULL;
+      --map->size;
+      return 0;
     }
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
 
-    *dst = (*dst)->next;
+  if (bkt->ksl) {
+    rv = nghttp2_ksl_remove(bkt->ksl, NULL, &key);
+    if (rv != 0) {
+      return rv;
+    }
     --map->size;
     return 0;
   }
+
   return NGHTTP2_ERR_INVALID_ARGUMENT;
 }
 
+void nghttp2_map_clear(nghttp2_map *map) {
+  uint32_t i;
+  nghttp2_map_bucket *bkt;
+
+  for (i = 0; i < map->tablelen; ++i) {
+    bkt = &map->table[i];
+    bkt->ptr = NULL;
+    if (bkt->ksl) {
+      nghttp2_ksl_free(bkt->ksl);
+      nghttp2_mem_free(map->mem, bkt->ksl);
+      bkt->ksl = NULL;
+    }
+  }
+
+  map->size = 0;
+}
+
 size_t nghttp2_map_size(nghttp2_map *map) { return map->size; }
diff --git a/deps/nghttp2/lib/nghttp2_map.h b/deps/nghttp2/lib/nghttp2_map.h
index f6e29e35f2d..2cf59f698e3 100644
--- a/deps/nghttp2/lib/nghttp2_map.h
+++ b/deps/nghttp2/lib/nghttp2_map.h
@@ -1,7 +1,8 @@
 /*
  * nghttp2 - HTTP/2 C Library
  *
- * Copyright (c) 2012 Tatsuhiro Tsujikawa
+ * Copyright (c) 2017 ngtcp2 contributors
+ * Copyright (c) 2012 nghttp2 contributors
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
@@ -30,8 +31,9 @@
 #endif /* HAVE_CONFIG_H */
 
 #include <nghttp2/nghttp2.h>
-#include "nghttp2_int.h"
+
 #include "nghttp2_mem.h"
+#include "nghttp2_ksl.h"
 
 /* Implementation of unordered map */
 
@@ -46,8 +48,13 @@ typedef struct nghttp2_map_entry {
 #endif
 } nghttp2_map_entry;
 
+typedef struct nghttp2_map_bucket {
+  nghttp2_map_entry *ptr;
+  nghttp2_ksl *ksl;
+} nghttp2_map_bucket;
+
 typedef struct {
-  nghttp2_map_entry **table;
+  nghttp2_map_bucket *table;
   nghttp2_mem *mem;
   size_t size;
   uint32_t tablelen;
@@ -119,6 +126,11 @@ nghttp2_map_entry *nghttp2_map_find(nghttp2_map *map, key_type key);
 int nghttp2_map_remove(nghttp2_map *map, key_type key);
 
 /*
+ * Removes all entries from |map|.
+ */
+void nghttp2_map_clear(nghttp2_map *map);
+
+/*
  * Returns the number of items stored in the map |map|.
  */
 size_t nghttp2_map_size(nghttp2_map *map);
diff --git a/deps/nghttp2/lib/nghttp2_session.c b/deps/nghttp2/lib/nghttp2_session.c
index 39f81f498cd..2e7e907f25e 100644
--- a/deps/nghttp2/lib/nghttp2_session.c
+++ b/deps/nghttp2/lib/nghttp2_session.c
@@ -959,6 +959,18 @@ int nghttp2_session_add_rst_stream(nghttp2_session *session, int32_t stream_id,
     return 0;
   }
 
+  /* Sending RST_STREAM to an idle stream is subject to protocol
+     violation.  Historically, nghttp2 allows this.  In order not to
+     disrupt the existing applications, we don't error out this case
+     and simply ignore it. */
+  if (nghttp2_session_is_my_stream_id(session, stream_id)) {
+    if ((uint32_t)stream_id >= session->next_stream_id) {
+      return 0;
+    }
+  } else if (session->last_recv_stream_id < stream_id) {
+    return 0;
+  }
+
   /* Cancel pending request HEADERS in ob_syn if this RST_STREAM
      refers to that stream. */
   if (!session->server && nghttp2_session_is_my_stream_id(session, stream_id) &&
@@ -969,8 +981,7 @@ int nghttp2_session_add_rst_stream(nghttp2_session *session, int32_t stream_id,
     headers_frame = &nghttp2_outbound_queue_top(&session->ob_syn)->frame;
     assert(headers_frame->hd.type == NGHTTP2_HEADERS);
 
-    if (headers_frame->hd.stream_id <= stream_id &&
-        (uint32_t)stream_id < session->next_stream_id) {
+    if (headers_frame->hd.stream_id <= stream_id) {
 
       for (item = session->ob_syn.head; item; item = item->qnext) {
         aux_data = &item->aux_data.headers;
@@ -5353,9 +5364,11 @@ static ssize_t inbound_frame_effective_readlen(nghttp2_inbound_frame *iframe,
   return (ssize_t)(readlen);
 }
 
+static const uint8_t static_in[] = {0};
+
 ssize_t nghttp2_session_mem_recv(nghttp2_session *session, const uint8_t *in,
                                  size_t inlen) {
-  const uint8_t *first = in, *last = in + inlen;
+  const uint8_t *first, *last;
   nghttp2_inbound_frame *iframe = &session->iframe;
   size_t readlen;
   ssize_t padlen;
@@ -5366,6 +5379,14 @@ ssize_t nghttp2_session_mem_recv(nghttp2_session *session, const uint8_t *in,
   size_t pri_fieldlen;
   nghttp2_mem *mem;
 
+  if (in == NULL) {
+    assert(inlen == 0);
+    in = static_in;
+  }
+
+  first = in;
+  last = in + inlen;
+
   DEBUGF("recv: connection recv_window_size=%d, local_window=%d\n",
          session->recv_window_size, session->local_window_size);
 
@@ -7448,8 +7469,8 @@ static int nghttp2_session_upgrade_internal(nghttp2_session *session,
     return NGHTTP2_ERR_INVALID_ARGUMENT;
   }
   /* SETTINGS frame contains too many settings */
-  if (settings_payloadlen / NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH
-        > session->max_settings) {
+  if (settings_payloadlen / NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH >
+      session->max_settings) {
     return NGHTTP2_ERR_TOO_MANY_SETTINGS;
   }
   rv = nghttp2_frame_unpack_settings_payload2(&iv, &niv, settings_payload,
diff --git a/deps/nghttp2/nghttp2.gyp b/deps/nghttp2/nghttp2.gyp
index 0dcd034b816..21fd6ba5ecf 100644
--- a/deps/nghttp2/nghttp2.gyp
+++ b/deps/nghttp2/nghttp2.gyp
@@ -44,6 +44,7 @@
         'lib/nghttp2_hd_huffman_data.c',
         'lib/nghttp2_helper.c',
         'lib/nghttp2_http.c',
+        'lib/nghttp2_ksl.c',
         'lib/nghttp2_map.c',
         'lib/nghttp2_mem.c',
         'lib/nghttp2_npn.c',