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Preserve HTTP status codes across target frameworks - #1767
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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 9a49da98-c8d8-4b90-a6ed-50afe18ac981
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Pull request overview
This PR improves cross-target consistency for HTTP error handling by preserving HTTP status codes on HttpRequestException even on targets that lack HttpRequestException.StatusCode (notably netstandard2.0). It does so by storing the status code in Exception.Data and providing helpers to create/read exceptions in a uniform way, including when AutoDetect wraps a failed SSE fallback.
Changes:
- Introduce
HttpRequestExceptionExtensionsto createHttpRequestExceptioninstances while persistingHttpStatusCodeinException.Data, and to retrieve the status viaStatusCodewhen available or the stored value otherwise. - Update AutoDetect’s SSE-fallback wrapping path to rethrow an
HttpRequestExceptioncreated via the helper, preserving the original Streamable HTTP status code across all TFMs. - Extend AutoDetect transport tests to assert status preservation via
Exception.Data(and viaStatusCodewhen available).
Reviewed changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
| tests/ModelContextProtocol.Tests/Transport/HttpClientTransportAutoDetectTests.cs | Adds assertions that surfaced HttpRequestException instances preserve the original HTTP status code via Exception.Data (and StatusCode on #if NET). |
| src/ModelContextProtocol.Core/Client/AutoDetectingClientSessionTransport.cs | Switches the dual-failure (Streamable HTTP + SSE fallback) wrap to use the new helper and preserve status codes consistently. |
| src/Common/HttpResponseMessageExtensions.cs | Adds internal helpers to create/read HttpRequestException with status preserved via Exception.Data as a cross-target fallback. |
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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com> Copilot-Session: 9a49da98-c8d8-4b90-a6ed-50afe18ac981
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Motivation and Context
HttpRequestException.StatusCodeis unavailable onnetstandard2.0, so HTTP status information is currently lost on that target. AutoDetect also recreates the original Streamable HTTP exception when SSE fallback fails, which must preserve the status for downstream handling.This prepares for #1765, where connect-time fallback needs to distinguish HTTP 400/404 responses consistently across all supported target frameworks.
Changes
HttpRequestExceptioninstances while preserving the HTTP status inException.Data.HttpRequestException.StatusCodewhere available, with the stored value as a cross-target fallback.net10.0,net9.0,net8.0, andnet472.No public API is added or changed.
How Has This Been Tested?
dotnet buildnet10.0,net9.0,net8.0, andnet472The ASP.NET conformance suite could not start locally because Node.js 21.6.2 does not provide
fs.globSync, which is required by the pinned conformance package.Breaking Changes
None.