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diff --git a/release-notes/7.0/preview/api-diff/rc1/Microsoft.AspNetCore.App/7.0-rc1_Microsoft.AspNetCore.Http.Features.md b/release-notes/7.0/preview/api-diff/rc1/Microsoft.AspNetCore.App/7.0-rc1_Microsoft.AspNetCore.Http.Features.md
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+++ b/release-notes/7.0/preview/api-diff/rc1/Microsoft.AspNetCore.App/7.0-rc1_Microsoft.AspNetCore.Http.Features.md
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+# Microsoft.AspNetCore.Http.Features
+
+``` diff
+ namespace Microsoft.AspNetCore.Http.Features {
++    [RequiresPreviewFeaturesAttribute("WebTransport is a preview feature")]
++    public interface IHttpWebTransportFeature {
++        bool IsWebTransportRequest { get; }
++        ValueTask<IWebTransportSession> AcceptAsync(CancellationToken cancellationToken = default(CancellationToken));
++    }
++    [RequiresPreviewFeaturesAttribute("WebTransport is a preview feature")]
++    public interface IWebTransportSession {
++        long SessionId { get; }
++        void Abort(int errorCode);
++        ValueTask<ConnectionContext?> AcceptStreamAsync(CancellationToken cancellationToken = default(CancellationToken));
++        ValueTask<ConnectionContext?> OpenUnidirectionalStreamAsync(CancellationToken cancellationToken = default(CancellationToken));
++    }
+ }
+```
+