Fix preserving %2F at HTTP/1 absolute-form request#65930
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DeagleGross merged 6 commits intodotnet:mainfrom Apr 13, 2026
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…ute-form When processing HTTP/1.1 absolute-form request targets (e.g., GET http://host/a%2Fb), Kestrel used Uri.LocalPath to extract the path, which decodes %2F to '/'. This differed from origin-form handling which uses PathDecoder.DecodePath that deliberately preserves %2F. Replace Uri.LocalPath with Uri.AbsolutePath (which preserves percent- encoding) followed by PathDecoder.DecodePath, ensuring both request- target forms produce identical HttpRequest.Path values. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
…ute-form When processing HTTP/1.1 absolute-form request targets (e.g., GET http://host/a%2Fb), Kestrel used Uri.LocalPath to extract the path, which decodes %2F to '/'. This differed from origin-form handling which uses PathDecoder.DecodePath that deliberately preserves %2F. Replace Uri.LocalPath with Uri.AbsolutePath (which preserves percent- encoding) followed by PathDecoder.DecodePath, ensuring both request- target forms produce identical HttpRequest.Path values. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
https://github.com/DeagleGross/aspnetcore into dmkorolev/kestrel-absolute-form-path-canonicalization # Conflicts: # src/Servers/Kestrel/Core/src/Internal/Http/Http1Connection.cs
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Pull request overview
This PR fixes an inconsistency in Kestrel HTTP/1.1 request-target parsing so that an encoded slash (%2F) is preserved in HttpRequest.Path for absolute-form targets, matching origin-form (and aligning with HTTP/2/3 path decoding behavior).
Changes:
- Add StartLineTests coverage for
%2Fpreservation in both origin-form and absolute-form request-targets. - Update
Http1Connection.OnAbsoluteFormTargetto derivePathviaPathDecoder.DecodePath(usingUri.AbsolutePath) instead ofuri.LocalPath, avoiding%2Fbeing decoded to/.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| src/Servers/Kestrel/Core/test/StartLineTests.cs | Adds test cases validating %2F stays encoded in Path for origin-form and absolute-form. |
| src/Servers/Kestrel/Core/src/Internal/Http/Http1Connection.cs | Switches absolute-form path materialization from Uri.LocalPath to PathDecoder.DecodePath over Uri.AbsolutePath to preserve %2F. |
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Fixes an inconsistency in HTTP/1.1 request-target parsing where
%2Fin the path produces differentHttpRequest.Path values depending on the request-target form: