url: throw descriptive error if url argument to parse() is not a string

Fixes #568.

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/url.js b/lib/url.js
index e4fcf779fac..4f7611da960 100644
--- a/lib/url.js
+++ b/lib/url.js
@@ -88,6 +88,10 @@ var protocolPattern = /^([a-z0-9]+:)/i,
 function urlParse(url, parseQueryString, slashesDenoteHost) {
   if (url && typeof(url) === 'object' && url.href) return url;
 
+  if (typeof url !== 'string') {
+    throw new TypeError("Parameter 'url' must be a string, not " + typeof url);
+  }
+
   var out = {},
       rest = url;