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Title: fix: accept wildcard media types in Accept header per RFC 7231 by shivama205 · Pull Request #2152 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: accept wildcard media types in Accept header per RFC 7231 by shivama205 · Pull Request #2152 · modelcontextprotocol/python-sdk

X Title: fix: accept wildcard media types in Accept header per RFC 7231 by shivama205 · Pull Request #2152 · modelcontextprotocol/python-sdk

Description: Summary Fix _check_accept_headers to accept wildcard media types (*/*, application/*, text/*) in the Accept header, per RFC 7231, section 5.3.2 Strip quality value parameters (e.g. ;q=0.8) before matching media types Add comprehensive tests for wildcard acceptance and rejection scenarios Problem The server rejected requests with wildcard Accept headers like */* or application/*, returning 406 Not Acceptable. This violated RFC 7231 and broke interoperability with HTTP clients that send Accept: */* by default (e.g. httpx, requests). Closes #1641 Test plan Wildcard */* accepted for both SSE and JSON-only modes application/* + text/* accepted for SSE mode application/* alone correctly rejected for SSE mode (doesn't cover text/event-stream) Quality parameters (*/*;q=0.8) handled correctly Truly missing Accept header still rejected Incompatible types (text/html) still rejected All 1134 existing tests pass Linting, formatting, and type checks clean

Open Graph Description: Summary Fix _check_accept_headers to accept wildcard media types (*/*, application/*, text/*) in the Accept header, per RFC 7231, section 5.3.2 Strip quality value parameters (e.g. ;q=0.8) before ...

X Description: Summary Fix _check_accept_headers to accept wildcard media types (*/*, application/*, text/*) in the Accept header, per RFC 7231, section 5.3.2 Strip quality value parameters (e.g. ;q=0.8) before ...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2152

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6af5bfe fix: accept wildcard media types in Accept header per RFC 7231 Feb 26, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2152/commits/6af5bfecbd14646f08dded9a3def7eb9020d9cc6
8e2ec6f fix: address review feedback for accept header parsing shivama205 Mar 6, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2152/commits/8e2ec6f58757f400eed13aabbade3732d7d32cee
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