fix: compare opaque fragment identifiers verbatim - #806
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markstory merged 2 commits intoJul 21, 2026
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`fragment_identifier_matcher` ran both the required identifier and the request URL fragment through `parse_qsl`. For an opaque fragment such as `/users/5` (no `=`), `parse_qsl` returns `[]`, so any two opaque fragments — or a request with no fragment at all — compared equal. A matcher for `#/users/5` therefore matched `#/users/6`, `#section2`, and URLs with no fragment. Only run the order-insensitive `parse_qsl` comparison when the identifier is query-string-style (contains `=`); otherwise compare the fragment strings verbatim. Key=value fragments are unaffected. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #806 +/- ##
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+ Coverage 99.84% 99.90% +0.06%
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Files 9 9
Lines 3295 3322 +27
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+ Hits 3290 3319 +29
+ Misses 5 3 -2 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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markstory
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This PR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [responses](https://github.com/getsentry/responses) ([changelog](https://github.com/getsentry/responses/blob/master/CHANGES)) | `==0.26.2` → `==0.26.3` |  |  | --- ### Release Notes <details> <summary>getsentry/responses (responses)</summary> ### [`v0.26.3`](https://github.com/getsentry/responses/blob/HEAD/CHANGES#0263) [Compare Source](getsentry/responses@0.26.2...0.26.3) - Added a `keep_headers` argument to `_recorder.record` and `Recorder.dump_to_file` to preserve named headers (for example `Date`) that are otherwise stripped as verbose defaults, so a signed response can be recorded and later verified. Matching is case-insensitive. See [#​763](getsentry/responses#763) - Fixed the element type exposed by `CallList` so static type checkers infer `Call` values when iterating, indexing, or filtering recorded calls. See [#​722](getsentry/responses#722) - Fixed `query_string_matcher` (and the query matching auto-applied to a registered URL's own query string) discarding blank-valued query params (`b=`), which caused requests with an extra or missing blank param to match incorrectly. See [#​804](getsentry/responses#804) - Fixed `fragment_identifier_matcher` treating opaque fragments (those without `=`, e.g. `/users/5`) as always equal, so a required fragment matched a different one or none at all. See [#​806](getsentry/responses#806) </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0NC4zMC4zIiwidXBkYXRlZEluVmVyIjoiNDQuMzAuMyIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==--> Co-authored-by: Renovate Bot <renovate-bot@git.greil.fr> Reviewed-on: https://git.greil.fr/mat/python-comwatt-client/pulls/55
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What type of PR is this?
Description
fragment_identifier_matcherran both the required identifier and the requestURL fragment through
parse_qsl. For an opaque fragment such as/users/5(no
=),parse_qslreturns[], so any two opaque fragments — or a requestwith no fragment at all — compared equal. A matcher registered for
#/users/5therefore also matched
#/users/6,#section2, and URLs with no fragment.This only runs the order-insensitive
parse_qslcomparison when the identifieris query-string-style (contains
=); otherwise it compares the fragmentstrings verbatim. Key=value fragments are unaffected.
Related Issues
None.
PR checklist
black/isort/flake8locally (all clean)Added/updated tests?
test_fragment_identifier_matcher_opaquefails onmain(thematcher accepts
#/users/6) and passes with this change; the fulltest_matchers.pysuite stays green.Disclosure: this change was authored by an AI coding agent (Claude Code) on this
account — it found the bug, reproduced it against
main, wrote the failing testfirst, and confirmed key=value fragments are unaffected. The account holder
reviews every change and is accountable for it. Happy to close if it's not
wanted.