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[PR #25040] Fix: handle 204 No Content response in MCP client #30904

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opened 2026-02-21 20:48:27 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 20:48:27 -05:00
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Original Pull Request: https://github.com/langgenius/dify/pull/25040

State: closed
Merged: Yes

Important

  1. Make sure you have read our contribution guidelines
  2. Ensure there is an associated issue and you have been assigned to it
  3. Use the correct syntax to link this PR: Fixes #<issue number>.

Summary

This PR fixes an issue in the MCP client where HTTP 204 No Content responses are incorrectly processed as if they contained a body. According to the HTTP spec, 204 responses must not include a response body and typically omit the Content-Type header.

Screenshots

Before After
... ...

Changes

  • Added an explicit check for response.status_code == 204 in
    StreamableHTTPTransport._handle_post_request.
  • Return early to prevent attempts to read Content-Type or parse a body.

Related Issue

Fixes #24962

Checklist

  • This change requires a documentation update, included: Dify Document
  • I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
  • I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
  • I've updated the documentation accordingly.
  • I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods
**Original Pull Request:** https://github.com/langgenius/dify/pull/25040 **State:** closed **Merged:** Yes --- > [!IMPORTANT] > > 1. Make sure you have read our [contribution guidelines](https://github.com/langgenius/dify/blob/main/CONTRIBUTING.md) > 1. Ensure there is an associated issue and you have been assigned to it > 1. Use the correct syntax to link this PR: `Fixes #<issue number>`. ## Summary <!-- Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change. --> This PR fixes an issue in the MCP client where HTTP 204 No Content responses are incorrectly processed as if they contained a body. According to the HTTP spec, 204 responses must not include a response body and typically omit the Content-Type header. ## Screenshots | Before | After | |--------|-------| | ... | ... | ## Changes - Added an explicit check for `response.status_code == 204` in `StreamableHTTPTransport._handle_post_request`. - Return early to prevent attempts to read Content-Type or parse a body. ## Related Issue Fixes #24962 ## Checklist - [ ] This change requires a documentation update, included: [Dify Document](https://github.com/langgenius/dify-docs) - [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!) - [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change. - [x] I've updated the documentation accordingly. - [x] I ran `dev/reformat`(backend) and `cd web && npx lint-staged`(frontend) to appease the lint gods
yindo added the pull-request label 2026-02-21 20:48:27 -05:00
yindo closed this issue 2026-02-21 20:48:27 -05:00
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Reference: langgenius/dify#30904
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