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Title: Replace httpx and httpx-sse with httpx2 by Kludex · Pull Request #2972 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Replace httpx and httpx-sse with httpx2 by Kludex · Pull Request #2972 · modelcontextprotocol/python-sdk

X Title: Replace httpx and httpx-sse with httpx2 by Kludex · Pull Request #2972 · modelcontextprotocol/python-sdk

Description: Summary Swaps the httpx + httpx-sse dependencies for httpx2 >=2.5.0. httpx2 is the next-generation httpx fork with server-sent events support built in, so the separate httpx-sse dependency is no longer needed. Changes Replace httpx>=0.27.1,<1.0.0 + httpx-sse>=0.4 with httpx2>=2.5.0 in the SDK and the example projects (lockfile regenerated). Rewrite the SSE transports against httpx2's API: aconnect_sse(...) → client.stream(...) / client.sse(...) wrapped in EventSource, and iterate the EventSource directly instead of .aiter_sse(). Document the swap as a v2 breaking change in docs/migration.md and docs/whats-new.md; update the docs, README, and example sources. Intentional behavior changes SSE GET streams send Accept: application/json, text/event-stream (previously exactly text/event-stream): httpx2's client.sse() lets the transport's headers win where httpx_sse force-overwrote them. Cache-Control: no-store is unchanged. TLS verification uses the operating system trust store via truststore instead of certifi's bundle; SSL_CERT_FILE/SSL_CERT_DIR are honored first. Documented in the migration guide. Loggers rename: httpx → httpx2, httpcore.* → httpcore2.*; the default User-Agent becomes python-httpx2/. simple-chatbot example: except httpx.RequestError → except httpx2.HTTPError, so HTTP status errors are reported instead of propagating (the old handler's status-error branch was unreachable). Notes httpx2 is API-compatible with httpx, so most of the diff is the httpx → httpx2 import rename. Users passing their own http_client only need to change the import. Tests use httpx2's AsyncClient.sse() convenience method for the raw-client SSE call sites. The httpx2 requirement deliberately has no upper bound, unlike v1's httpx<1.0.0 cap (#2345): httpx2 is maintained in lockstep with this SDK, so a breaking httpx2 major would land alongside a coordinated SDK release rather than being fenced off ahead of time. Verification ruff, pyright, and the full test suite all pass at 100% coverage (strict-no-cover clean). AI Disclaimer This PR was developed with the assistance of either Claude or Codex. I've reviewed and verified the changes.

Open Graph Description: Summary Swaps the httpx + httpx-sse dependencies for httpx2 >=2.5.0. httpx2 is the next-generation httpx fork with server-sent events support built in, so the separate httpx-sse dependency is no...

X Description: Summary Swaps the httpx + httpx-sse dependencies for httpx2 &gt;=2.5.0. httpx2 is the next-generation httpx fork with server-sent events support built in, so the separate httpx-sse dependency i...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2972

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ac69e24 Replace httpx and httpx-sse with httpx2 Kludex Jun 25, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2972/commits/ac69e24fe7faa1365bed8d226bc9b90ea21e6987
dc6b9ea Update conformance client to httpx2 maxisbey Jun 29, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2972/commits/dc6b9eaaea9485501bdd48d40e05dc985d05ea12
b8775a1 Convert httpx usage added on main to httpx2 maxisbey Jun 29, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2972/commits/b8775a1d4b70b8447df590d92801bccd037c6b5d
dae920c Restore SSE request headers via AsyncClient.sse(); fix example fallout maxisbey Jun 29, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2972/commits/dae920cc5c530280b17b2367811a2b214082c7cb
bb9af61 Wrap test signature that exceeded the line limit after the rename maxisbey Jun 29, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2972/commits/bb9af61334688e43bec3f4e049ce19617721199a
684dfff Drop None args no longer accepted by ServerSentEvent maxisbey Jun 29, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2972/commits/684dfff769ac947d929e1698899652175c3318d8
422d7b0 Convert httpx usage added on main since the last rebase to httpx2 maxisbey Jul 14, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2972/commits/422d7b0eda726e77d94474cda35ceb0e1019c446
2c901e8 Port the httpx2 migration notes into the restructured docs maxisbey Jul 14, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2972/commits/2c901e8d6c05aee501b0260757a37684214bde09
8a2dfbf Mention the SSL_CERT_FILE remedy and update stale HTTPX docstrings maxisbey Jul 14, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2972/commits/8a2dfbfa7a6f541367aece4857ff5cd6e56de2ae
4351721 Document httpx2 exception migration and the TLS change in whats-new maxisbey Jul 14, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2972/commits/43517218a6b20f0a4bf778fbc1ee993cc11c5516
0fc6043 Lead the whats-new entry with the httpx2 swap; note logger and UA ren… maxisbey Jul 14, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2972/commits/0fc604300e92af1b4a2af8b4dd395fbc76c9ba2c
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