[dependabot]

Bumps starlette from 1.9.0 to 1.10.0.

Release notes

Sourced from starlette's releases.

Version 1.10.0

📝 Leaner URL-encoded form parsing

Starlette 1.10.0 parses URL-encoded forms with less memory and CPU, no longer drops the last field when a stream ends early, and lets you compare FormData that holds several uploads under one key.

uv pip install starlette==1.10.0

• Forms with many fields parse faster and use less memory (#3724). FormParser builds each field in the parser callbacks instead of queueing every event and replaying it. On CodSpeed, 1000 fields went from 42.8 ms to 34.9 ms and from 63.5 KB to 54.5 KB, and the max_fields limit case went from 6,880 B to 864 B.
• The last field is kept when the request stream ends without an empty chunk (#3599). The parser is now finalized once the stream is exhausted, so custom streams that never yield a final b"" no longer lose their last field.
• FormData with repeated uploads can be compared (#3619). Comparing two FormData objects with several UploadFile values under the same key used to raise TypeError.

⚠️ Behaviour changes

• Multidict equality keeps the order of values under a repeated key (#3619). Keys can still appear in any order, but QueryParams("a=1&a=2") and QueryParams("a=2&a=1") are no longer equal, matching what getlist() returns.
• starlette.formparsers.FormMessage is deprecated (#3724). The parser no longer uses it, and FormParser.messages is gone. Calling FormMessage(...) emits a StarletteDeprecationWarning.

🧭 Routing and URL generation

• Path parameter values that look like a placeholder are kept as they are (#3725). url_path_for("route", category="{id}", id="42") on /{category}/{id} now returns /{id}/42 instead of /42/42. Substitution also got faster, from 549 ns to 520 ns with two parameters and from 1,078 ns to 779 ns with five.
• Route matching does less work per request (#3665, #3722). Match members are compared by identity, cutting up to 4.9% of the instructions per dispatch in the routing benchmarks.
• WSGIMiddleware strips root_path only at a path segment boundary (#3718). A request to /application under a root_path of /app no longer becomes /lication.
• FloatConvertor reports NaN and infinity correctly (#3716). NaN was reported as a negative float.

🛡️ Middleware, responses and config

• Handled exceptions no longer keep requests alive (#3205). Starlette clears the traceback after an exception handler runs, so an exception instance reused across requests, such as a module-level HTTPException, no longer pins per-request objects in memory.
• Middlewares accept http.response.start without headers (#3721). BaseHTTPMiddleware, GZipMiddleware and SessionMiddleware default the omitted field to an empty list instead of raising KeyError.
• FileResponse ignores Range on methods other than GET and HEAD (#3679). A POST endpoint that returns a file now sends the full file, as RFC 9110 requires.
• Config strips one pair of matching outer quotes from env file values (#3720). KEY='say "hi"' now reads as say "hi" instead of say "hi.

Full changelog: 1.9.0...1.10.0

Changelog

Sourced from starlette's changelog.

1.10.0 (October 24, 2026)

Changed

• Compare multidicts such as FormData and QueryParams by key while keeping the order of values under a repeated key, so FormData with repeated uploads no longer raises TypeError. QueryParams("a=1&a=2") and QueryParams("a=2&a=1") are no longer equal #3619.
• Build URL-encoded form fields in the parser callbacks, lowering memory and CPU usage for forms with many fields #3724.
• Compare Match members by identity during routing #3665 and #3722.

Deprecated

• Deprecate starlette.formparsers.FormMessage, which is no longer used #3724.

Fixed

• Parse the last URL-encoded form field when the request stream ends without an empty chunk #3599.
• Keep path parameter values that look like another placeholder in url_path_for() #3725.
• Default omitted http.response.start headers in BaseHTTPMiddleware, GZipMiddleware and SessionMiddleware instead of raising KeyError #3721.
• Clear the traceback of handled exceptions, so reused exception instances no longer keep per-request objects alive #3205.
• Strip only one pair of matching outer quotes from Config env file values #3720.
• Strip root_path from PATH_INFO only at a path segment boundary in WSGIMiddleware #3718.
• Report NaN and infinity correctly in FloatConvertor.to_string() #3716.
• Ignore Range on requests other than GET and HEAD in FileResponse #3679.

Commits

• 8aa828c Version 1.10.0 (#3728)
• a85a5c3 Substitute URL path parameters in a single pass (#3725)
• 6b8b612 Finalize URL-encoded form parsing at stream exhaustion (#3599)
• b973efd Build URL-encoded form fields in parser callbacks (#3724)
• d7731e0 Compare FormData with repeated uploads without raising TypeError (#3619)
• fb3e818 Compare remaining Match members by identity in routing (#3722)
• fc23aa1 Compare Match members by identity in Router.app (#3665)
• fe000fb Replace the removed route decorator hint in the host routing docs (#3713)
• 4114432 Default omitted http.response.start headers in middlewares (#3721)
• 1a01a02 Clear exc.traceback after handled exceptions to prevent memory leak (#3205)
• Additional commits viewable in compare view