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Title: Fix SSE client handling of nested path URLs by danilpavlov · Pull Request #386 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Fix SSE client handling of nested path URLs by danilpavlov · Pull Request #386 · modelcontextprotocol/python-sdk

X Title: Fix SSE client handling of nested path URLs by danilpavlov · Pull Request #386 · modelcontextprotocol/python-sdk

Description: Fix SSE client failing when connecting to servers with nested paths (e.g., http://domain/path1/path2/sse). Previously, the client worked only with simple URLs like http://domain/sse. The fix extracts the base path segment between domain and /sse endpoint using regex, then correctly constructs the response URL by preserving the path structure. This ensures proper communication with MCP servers hosted under non-root paths. Without this fix, clients couldn't connect to SSE servers deployed under nested paths, as the endpoint URLs for posting messages were constructed incorrectly. Motivation and Context I got problem while deploying my MCP server inside a Kubernetes cluster. The SSE client was only working with simple URLs like http://example-domain/sse, but failed to properly handle more complex paths such as http://example-domain/path1/path2/sse. When the server was deployed under nested paths, the client couldn't establish a proper connection because it was incorrectly constructing the endpoint URLs for posting messages. This made it impossible to use MCP servers hosted under non-root paths, which is a common scenario in Kubernetes environments where services often run behind path-based routing. How Has This Been Tested? I ve tested on version for local mcp server (http://localhost:8000/sse) and with special mask (http://domain/dummy/sse) Types of changes Bug fix (non-breaking change which fixes an issue) New feature (non-breaking change which adds functionality) Breaking change (fix or feature that would cause existing functionality to change) Documentation update Checklist I have read the MCP Documentation My code follows the repository's style guidelines New and existing tests pass locally I have added appropriate error handling I have added or updated documentation as needed

Open Graph Description: Fix SSE client failing when connecting to servers with nested paths (e.g., http://domain/path1/path2/sse). Previously, the client worked only with simple URLs like http://domain/sse. The fix extrac...

X Description: Fix SSE client failing when connecting to servers with nested paths (e.g., http://domain/path1/path2/sse). Previously, the client worked only with simple URLs like http://domain/sse. The fix extrac...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/386

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b42b35a fix(): SSE client handling of nested path URLs Mar 27, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/b42b35a983ca4689659e060d4f2affeb51af3319
5a4d420 style: format max-line Mar 27, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/5a4d42053b48d1101f482b2de66699a5b8933c31
21a775f fix: imports Mar 28, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/21a775f21e12e2a03b7141acc4bc8d8ac99bf82e
7e1b9d3 Merge branch 'main' into main danilpavlov Mar 28, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/7e1b9d345655e783e6633321e90ab35eaef8926b
9a58b30 fixing /mcp case prefix on langchain jonathanglima Apr 7, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/9a58b30886d3e044a2a206de31e287a4d7c962e1
ac3acbb Merge pull request #1 from jonathanglima/main danilpavlov Apr 8, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/ac3acbbe2402d42e011a76fd70ad364aba60ad42
8e76e8a style: Added noqa to avoid max-line of code Apr 8, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/8e76e8a5c6fb48a7513e5173041694cafc26901d
e6d5b00 Fix generate accurate session_uri for nested SSE paths sebin1213 Apr 9, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/e6d5b00991a9abcfe2469e2fed929d0113ad6e3a
1ac7b63 Fix generate accurate session_uri for nested SSE paths sebin1213 Apr 9, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/1ac7b63fe648fb2c8bcf87bed0797da79650881e
7cece5e Fix generate accurate session_uri for nested SSE paths sebin1213 Apr 9, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/7cece5e8e6afeb97eb4e81988acb948a4d512ac5
96baf33 Merge pull request #2 from sebin1213/main danilpavlov Apr 9, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/96baf3340268dc7051a176cb87dca18597ddbe7f
3728328 style: format to avoid max-line validation error Apr 9, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/3728328497814e046293e5ffc8ac8571968e9e2d
e1ca588 style: reorganize imports Apr 9, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/386/commits/e1ca588e07e83a8a2178582a48235935861b2f98
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