fix(fastapi): use effective_route_context path for prefixed routers#6572
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The fix handles the case where FastAPI >= 0.137 stores the
prefix-resolved path in scope["fastapi"]["effective_route_context"] instead of scope["route"].path, so transactions/segments now show the full /api/users/{user_id} path instead of the unprefixed
/users/{user_id}.
Additionally, in the case of the `strawberry` framework without a specified path, this would fallback to using `generic FastAPI request` instead of using the prefix provided in the router (like `graphql` in the test cases.
Fixes PY-2530
Fixes #6571
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alexander-alderman-webb
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Jun 15, 2026
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Codecov Results 📊✅ 90590 passed | ⏭️ 6031 skipped | Total: 96621 | Pass Rate: 93.76% | Execution Time: 320m 11s 📊 Comparison with Base Branch
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All tests are passing successfully. ✅ Patch coverage is 100.00%. Project has 2421 uncovered lines. Files with missing lines (1)
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## main #PR +/-##
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+ Coverage 29.67% 89.75% +60.08%
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Files 192 192 —
Lines 23615 23619 +4
Branches 8130 8132 +2
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FastAPI >= 0.137 stores the prefix-resolved path in
scope["fastapi"]["effective_route_context"]instead ofscope["route"].path, so transactions/segments were showing the unprefixed/users/{user_id}instead of the full/api/users/{user_id}for routers mounted with a prefix.This fix prefers
effective_route_context.pathwhen available, falling back toroute.pathfor older FastAPI versions.Fixes PY-2530
Fixes #6571