fix(server): correct poor rate limit responses detection

[mdevolde]

fix(server): correct poor rate limit responses detection

Why the pull request was made

To have a better detection of rate limit responses, even if the body of the rate limit become a JSON response.

Summary of changes

• Detect rate limit responses even in JSON responses.

Screenshots (if appropriate):

Not applicable.

How has this been tested?

Applied local tests.

Resources

Not applicable.

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 not work as expected)
• Documentation update (changes to documentation only)
• Refactor / code style update (non-breaking change that improves code structure or readability)
• Tests / CI improvement (adding or updating tests or CI configuration only)
• Chore / maintenance (non-breaking change that does not affect functionality, such as updating dependencies or fixing typos)
• Other (please describe):

Checklist

• Followed the project's contributing guidelines.
• Updated any relevant tests.
• Updated any relevant documentation.
• Added comments to your code where necessary.
• Formatted your code, run the linters, checked types and tests.
• Added your changes to the CHANGELOG file, if applicable.

[Copilot]

Pull request overview

Improves LanguageTool._query_server error handling so rate-limit responses are detected based on HTTP status code (426) rather than only when JSON parsing fails, preventing rate-limited JSON bodies from being returned as successful data.

Changes:

• Raise RateLimitError immediately when _HTTP_STATUS_RATE_LIMIT is returned, before attempting response.json().
• Remove the now-unnecessary rate-limit handling from the JSON decode error path.
• Document the bug fix in CHANGELOG.md.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/language_tool_python/server.py	Moves rate-limit detection to happen before JSON parsing so valid JSON rate-limit bodies don’t get treated as successful responses.
CHANGELOG.md	Adds an entry describing the fixed rate-limit detection behavior.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.65%. Comparing base (5441b53) to head (eaea6b8).
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #211   +/-   ##
=======================================
  Coverage   80.65%   80.65%           
=======================================
  Files          13       13           
  Lines        1768     1768           
=======================================
  Hits         1426     1426           
  Misses        342      342           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.