Update server-fetch proxy implementation for httpx 0.28+ #1146

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1. olaservo

   added

   enhancementNew feature or requestNew feature or request

   server-fetchReference implementation for the Fetch MCP server - src/fetchReference implementation for the Fetch MCP server - src/fetch

   on Mar 30, 2025
2. fat-tire commented on May 2, 2025

   

   fat-tire

   on May 2, 2025

   More actions

   I think this is just a matter of changing "proxies" to "proxy" in line 75 and 119 of server.py

   See: encode/httpx#2879 for the httpx change. I don't know why they broke this when they could have been backwards-compatible.

   I can submit the above change as a PR, but since they created it as an incompatible change to httpx, this would break for versions before that change. Still, I do think the newest version of httpx should probably be supported (and I suppose a "smart" invocation could be added to check if proxies is valid and use that).

   👍React with 👍1Reacted by rxm7706
3. cliffhall commented on Oct 19, 2026

   

   cliffhall

   on Oct 19, 2026

   Member

   More actions

   Closing: superseded by the v2 release.

   Thank you for reporting this, and apologies for the long wait for a response.

   Since this was filed, the reference servers have been rebuilt for the 2026-07-28 MCP specification (#4857) and released as v2 (2.0.0 on npm for the TypeScript servers, 2026.10.19 on PyPI for the Python servers). Each server now runs on v2 of its SDK, and the behavior described here has either been fixed or no longer exists in the same form. The fetch server now builds its client with httpx's proxy= argument, so the deprecated proxies= usage that blocked httpx 0.28+ is gone.

   This is not a judgment on whether the problem was real; it's a consequence of the code it describes having been replaced. This is happening as part of the backlog triage in #4875.

   If this still happens on the v2 release, we'd genuinely like to know. Please open a fresh issue with the version you're running and steps to reproduce, and we'll look at it. Note that this repository accepts contributions as issues rather than pull requests; see CONTRIBUTING.md.

   Thanks for taking the time to report it.
4. cliffhall

   closed this as not plannedon Oct 19, 2026
5. cliffhall

   added

   closed-superseded-v2Closed: fixed or made obsolete by the v2 / 2026-07-28 refactor (#4875)Closed: fixed or made obsolete by the v2 / 2026-07-28 refactor (#4875)

   on Oct 19, 2026