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15 release notes curated from 1 source by the Releasebot Team. Last updated: Aug 18, 2026

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uvicorn

15 release notes

Aug 18, 2026
Date parsed from source:
Aug 18, 2026

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Aug 18, 2026
uvicorn by Kludex

Version 0.52.4

uvicorn fixes duplicate Date headers in accepted WebSocket handshakes with websockets-sansio.

Fixed

Remove duplicate Date headers from accepted WebSocket handshakes with websockets-sansio (#3078)

Full Changelog: 0.52.3...0.52.4
Original source
Aug 13, 2026
Date parsed from source:
Aug 13, 2026

First seen by Releasebot:
Aug 13, 2026
uvicorn by Kludex

Version 0.52.3

uvicorn updates zttp to 0.0.24 and improves HTTP/1.1 request parsing performance.

Changed

Update zttp to 0.0.24 and use its combined receive path, improving HTTP/1.1 request parsing performance (#3067)

Full Changelog: 0.52.2...0.52.3
Original source
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Aug 13, 2026
Date parsed from source:
Aug 13, 2026

First seen by Releasebot:
Aug 13, 2026
uvicorn by Kludex

Version 0.52.2

uvicorn fixes zttp to 0.0.22, improving bodyless request handling and HTTP/1 request parsing performance.

Fixed

Update zttp to 0.0.22, fixing bodyless request receives and improving HTTP/1 request parsing performance (#3063)

Full Changelog: 0.52.1...0.52.2
Original source
Aug 1, 2026
Date parsed from source:
Aug 1, 2026

First seen by Releasebot:
Aug 1, 2026
uvicorn by Kludex

Version 0.52.1

uvicorn fixes WebSocket reliability with better closing handshakes, write flow control, and backpressure handling, while also cleaning up denial responses to avoid duplicate headers and preserve non-UTF-8 bodies intact.
Fixed

Complete the closing handshake on server-initiated WebSocket closes in the websockets-sansio and wsproto implementations, waiting for the client's close reply with a 10 second timeout instead of resetting the connection (#3053)

Add missing write flow control to the websockets-sansio implementation, preventing data truncation on server-initiated closes with large in-flight payloads (#3048)

Handle connection loss while a WebSocket write is waiting on backpressure (#3050)

Remove duplicate Content-Type and Content-Length headers from WebSocket denial responses on the websockets-sansio implementation, and deliver non-UTF-8 denial bodies intact (#3041)

Full Changelog: 0.52.0...0.52.1
Original source
Jul 29, 2026
Date parsed from source:
Jul 29, 2026

First seen by Releasebot:
Jul 29, 2026
uvicorn by Kludex

Version 0.52.0

uvicorn adds an experimental zttp-backed HTTP/1.1 implementation selectable with --http zttp and fixes WebSocket request headers to stay intact with websockets 17.0.
This release adds an experimental HTTP/1.1 implementation backed by zttp, a sans-IO HTTP parser I've been developing on the side: a core written in Zig, with bindings to Python. It has been running under a fuzzer for some weeks now, and has been through multiple rounds of security auditing.

It is still experimental, so don't put it in front of production traffic yet. Try it with --http zttp, and please send any feedback to the issue tracker.

Added

Add an experimental zttp HTTP/1.1 implementation, selectable with --http zttp (#2979)

Fixed

Keep non-ASCII WebSocket request headers intact with websockets 17.0, which encodes them with ISO-8859-1 (#3036)

Full Changelog: 0.51.0...0.52.0
Original source
Similar to Kludex with recent updates:
Jul 8, 2026
Date parsed from source:
Jul 8, 2026

First seen by Releasebot:
Jul 27, 2026
uvicorn by Kludex

Version 0.51.0

uvicorn adds near-zero-downtime worker reloads on SIGHUP and removes colorama from the standard extra.

What's Changed

Restart workers with overlap on SIGHUP for near-zero-downtime reloads by @Kludex in #3025

Remove colorama from the standard extra by @Kludex in #3027

Full Changelog: 0.50.2...0.51.0
Original source
Jul 6, 2026
Date parsed from source:
Jul 6, 2026

First seen by Releasebot:
Jul 27, 2026
uvicorn by Kludex

Version 0.50.2

uvicorn requires websockets>=13.0 for the default sansio implementation in this release.

What's Changed

Require websockets>=13.0 for the default sansio implementation by @Kludex in #3021

Full Changelog: 0.50.1...0.50.2
Original source
Jul 6, 2026
Date parsed from source:
Jul 6, 2026

First seen by Releasebot:
Jul 27, 2026
uvicorn by Kludex

Version 0.50.1

uvicorn fixes websockets-sansio to split comma-separated Sec-WebSocket-Protocol values.

What's Changed

Split comma-separated Sec-WebSocket-Protocol values in the websockets-sansio implementation by @Aayush7352 in #3019

New Contributors

@Aayush7352 made their first contribution in #3019

Full Changelog: 0.50.0...0.50.1
Original source
Jul 4, 2026
Date parsed from source:
Jul 4, 2026

First seen by Releasebot:
Jul 27, 2026
uvicorn by Kludex

Version 0.50.0

uvicorn improves performance and worker startup while modernizing WebSocket handling, memoizing trusted host checks, caching ASGI scope data, and defaulting to websockets-sansio. It also adds a dedicated startup failure exit code and refines internal styling and payload handling.
What's Changed

Memoize trusted host checks to avoid re-parsing the client IP per request by @Kludex in #2970

Cache the asgi scope sub-dict per connection by @Kludex in #2976

Build a fresh asgi scope dict per request by @Kludex in #2977

Replace click.style with an internal ANSI style helper by @Kludex in #2981

Avoid copying single-frame WebSocket payloads in websockets-sansio by @Kludex in #2983

Deprecate the legacy websockets implementation and default auto to websockets-sansio by @Kludex in #2985

Exit with a dedicated code on startup failure and stop the supervisor when a worker can't boot by @Kludex in #3001

Skip the eager app import in the parent when spawning workers by @Kludex in #3012

Full Changelog: 0.49.0...0.50.0
Original source
Jun 3, 2026
Date parsed from source:
Jun 3, 2026

First seen by Releasebot:
Jul 27, 2026
uvicorn by Kludex

Version 0.49.0

uvicorn bumps its httptools minimum to 0.8.0 and changes ProxyHeadersMiddleware to consume duplicate forwarding headers.
What's Changed

Bump httptools minimum version to 0.8.0 by @Kludex in #2962

Consume duplicate forwarding headers in ProxyHeadersMiddleware (reverses the 0.48.0 behavior of ignoring them) by @Kludex in #2971

Full Changelog: 0.48.0...0.49.0
Original source
May 24, 2026
Date parsed from source:
May 24, 2026

First seen by Releasebot:
Jul 27, 2026
uvicorn by Kludex

Version 0.48.0

uvicorn defaults ssl_ciphers to OpenSSL settings and ignores duplicate forwarding headers in ProxyHeadersMiddleware.
What's Changed

Default ssl_ciphers to None and use OpenSSL defaults by @Kludex in #2940

Ignore duplicate forwarding headers in ProxyHeadersMiddleware by @Kludex in #2944

Full Changelog: 0.47.0...0.48.0
Original source
May 14, 2026
Date parsed from source:
May 14, 2026

First seen by Releasebot:
Jul 27, 2026
uvicorn by Kludex

Version 0.47.0

uvicorn ships eager ASGI app import, custom SSLContext configuration, and improved file descriptor handling.
What's Changed

Eagerly import the ASGI app in the parent process by @Kludex in #2919

Add ssl_context_factory for custom SSLContext configuration by @Kludex in #2920

Treat fd=0 as a valid file descriptor with reload/workers by @eltoder in #2927

Full Changelog: 0.46.0...0.47.0
Original source
Apr 23, 2026
Date parsed from source:
Apr 23, 2026

First seen by Releasebot:
Jul 27, 2026
uvicorn by Kludex

Version 0.46.0

uvicorn adds ws_max_size and ping timeout support in wsproto plus WebSocket buffer improvements.
What's Changed

Support ws_max_size in wsproto implementation by @Kludex in #2915

Support ws_ping_interval and ws_ping_timeout in wsproto implementation by @Kludex in #2916

Use bytearray for incoming WebSocket message buffer in websockets-sansio by @Kludex in #2917

Full Changelog: 0.45.0...0.46.0
Original source
Apr 21, 2026
Date parsed from source:
Apr 21, 2026

First seen by Releasebot:
Jul 27, 2026
uvicorn by Kludex

Version 0.45.0

uvicorn adds proxy header port preservation, more flexible logging config and log level handling, clearer PyYAML errors, and a new reset-contextvars flag to isolate ASGI request context, while also reverting a couple of recent ASGI and streaming response changes.
What's Changed

Preserve forwarded client ports in proxy headers middleware by @Kludex in #2903

Accept os.PathLike for log_config by @Kludex in #2905

Accept log_level strings case-insensitively by @Kludex in #2907

Raise helpful ImportError when PyYAML is missing for YAML log config by @Kludex in #2906

Revert empty context for ASGI runs by @Kludex in #2911

Add --reset-contextvars flag to isolate ASGI request context by @Kludex in #2912

Revert "Emit http.disconnect on server shutdown for streaming responses" (#2829) by @Kludex in #2913

New Contributors

@Krishnachaitanyakc made their first contribution in #2870

Full Changelog: 0.44.0...0.45.0
Original source
Apr 6, 2026
Date parsed from source:
Apr 6, 2026

First seen by Releasebot:
Jul 27, 2026
uvicorn by Kludex

Version 0.44.0

uvicorn adds websocket keepalive pings for websockets-sansio.

What's Changed

Implement websocket keepalive pings for websockets-sansio by @Kludex in #2888

Full Changelog: 0.43.0...0.44.0
Original source