we default to json respond even when html needed

[YasenT]

Right now, when a standard browser tries to open the simple endpoint, it gets a json response instead of the expected html one. This was raised by users.
Pushing forward a quick fix

Summary by CodeRabbit

• Bug Fixes

  • Improved PyPI Simple API content negotiation using Accept header quality values and media-type specificity.
  • Correctly respects explicit exclusions (q=0) and wildcard preferences when selecting HTML or JSON responses.
  • Added support for format and fmt query parameters on list and retrieve requests.
  • Improved fallback behavior when requested response formats cannot be served.

• Tests

  • Expanded coverage for weighted, wildcard, and excluded media types in Accept headers.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between 7562275 and ad59e66.

📒 Files selected for processing (2)

• pulp_python/app/pypi/views.py
• pulp_python/tests/functional/api/test_pypi_simple_api.py

🚧 Files skipped from review as they are similar to previous changes (1)

• pulp_python/tests/functional/api/test_pypi_simple_api.py

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📝 Walkthrough

Walkthrough

The PyPI Simple API now performs q-aware, specificity-aware Accept negotiation. It supports format overrides, fixed renderer ordering, HTML fallback for other actions, and functional tests for wildcards and exclusions.

Changes

Accept header negotiation

Layer / File(s)	Summary
Media type preference parsing pulp_python/app/pypi/views.py	Parses media ranges, q-values, specificity, exclusions, and header order. Empty or unmatched headers default to HTML.
Renderer selection and validation pulp_python/app/pypi/views.py, pulp_python/tests/functional/api/test_pypi_simple_api.py	List and retrieve actions use format overrides or negotiated media types. Other actions use DRF negotiation with an HTML fallback. Tests cover weighted preferences, wildcards, and q=0 exclusions.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Suggested reviewers: gerrod3, jobselko

Merge Risk: ⚪ Minimal · up to ad59e

The Simple API retains its documented HTML fallback for unsupported Accept headers. No actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description clearly states the user-reported issue and the intended fix. It does not include the required checklist or confirm the changelog, AI policy, documentation, and test coverage requiremen…	Complete the pull request description template. Confirm each checklist item, including commit quality, changelog entry, AI policy compliance, and documentation and test coverage. Add a concise implementation summary if needed.
Docstring Coverage	⚠️ Warning	Docstring coverage is 57.14% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title identifies the main issue: the simple endpoint returns JSON when browsers require HTML. It is related to the changes, although the wording is grammatically unclear.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Description check

Explanation

The description clearly states the user-reported issue and the intended fix. It does not include the required checklist or confirm the changelog, AI policy, documentation, and test coverage requirements.

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Actionable comments posted: 1

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Inline comments:
In `@pulp_python/app/pypi/views.py`:
- Line 94: Update _accept_prefers_json and the renderer-selection flow to
perform q-aware negotiation using the most-specific matching Accept range,
including text/* and */*; ensure a specific q=0 overrides wildcard matches
rather than allowing JSON to win by renderer order. Add regression tests
covering wildcard preferences and JSON exclusions, asserting the negotiated
Content-Type.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 3b277ceb-2eec-435c-943e-54ef0d546414

📥 Commits

Reviewing files that changed from the base of the PR and between a47e20f and 7562275.

📒 Files selected for processing (2)

• pulp_python/app/pypi/views.py
• pulp_python/tests/functional/api/test_pypi_simple_api.py

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

[gerrod3]

I can't reproduce this issue on a local pulp-instance. Are you sure the problem isn't with your deployment?