[dependabot]

Bumps uvicorn from 0.52.4 to 0.54.0.

Release notes

Sourced from uvicorn's releases.

Version 0.54.0

📨 Send metadata after the response body

uvicorn 0.54.0 adds response trailers and 103 Early Hints to its experimental HTTP/2 implementation through zttp.

uv add uvicorn==0.54.0 "zttp>=0.0.34"

• Send HTTP/2 response trailers (#3146). The ASGI http.response.trailers extension lets applications send metadata, such as checksums, after the response body. Clients must send TE: trailers to receive them. Multiple trailer messages are combined before completing the response.
• HTTP/2 remains experimental and opt-in. Enable it with --http zttp --http2. Upgrade-based h2c and WebSockets over HTTP/2 remain unsupported.

💡 Hint at resources before the final response

• Send 103 Early Hints over HTTP/2 (#3137). Applications can use the ASGI http.response.early_hint extension to send resource hints before the final response. Each supplied link becomes a separate Link header.

Full changelog: 0.53.0...0.54.0

Version 0.53.0

🌐 Opt-in HTTP/2 support

uvicorn 0.53.0 adds experimental HTTP/2 through zttp, alongside a new zuvloop integration and connection-handling improvements.

uv add uvicorn==0.53.0

• Serve HTTP/1.1 and HTTP/2 with zttp (#2982, #3101). Install zttp, then enable HTTP/2 with --http zttp --http2. Uvicorn negotiates HTTP/2 over TLS with ALPN and supports cleartext prior knowledge.
• HTTP/2 remains experimental. Upgrade-based h2c and WebSockets over HTTP/2 are not supported.

⚙️ More event loop choice

• Run Uvicorn with zuvloop (#3104). Install zuvloop separately and select it explicitly with --loop zuvloop on CPython 3.14 or newer.

🛡️ More reliable connections and proxies

• Honor Connection: close token lists (#3103). Uvicorn now parses comma-separated tokens case-insensitively across HTTP implementations.
• Trust IPv6 loopback proxies by default (#3119). The default FORWARDED_ALLOW_IPS value now includes ::1.
• Keep upgraded WebSockets alive (#3107). Uvicorn cancels the HTTP keep-alive timer when the connection becomes a WebSocket.

Full changelog: 0.52.4...0.53.0

Changelog

Sourced from uvicorn's changelog.

0.54.0 (September 24, 2026)

HTTP/2 support remains experimental. Install zttp>=0.0.34 and enable it with --http zttp --http2.

Added

• Add HTTP/2 response trailers through the ASGI http.response.trailers extension. Clients must send TE: trailers to receive them (#3146)
• Add HTTP/2 103 Early Hints through the ASGI http.response.early_hint extension (#3137)

0.53.0 (September 14, 2026)

This release adds experimental HTTP/2 support through zttp. Enable it with --http zttp --http2. Upgrade-based h2c and WebSockets over HTTP/2 are not supported.

Added

• Add experimental HTTP/2 support through zttp (#2982, #3101)
• Add support for zuvloop (#3104)

Fixed

• Handle comma-separated, case-insensitive Connection: close tokens across HTTP implementations (#3103)
• Trust IPv6 loopback in the default FORWARDED_ALLOW_IPS value (#3119)
• Cancel the HTTP keep-alive timer when upgrading to WebSocket (#3107)

Commits

• 3eb9a9a Version 0.54.0 (#3161)
• cd7ef6d Remove races from supervisor tests (#3134)
• a56c7cc Support HTTP/2 response trailers (#3146)
• 9bd4404 chore(deps): bump anyio from 4.13.0 to 4.14.2 (#3145)
• 21f39ef Add HTTP/2 Early Hints support (#3137)
• 421708f Version 0.53.0 (#3136)
• f1a1bff Unset the keep-alive timer when upgrading to WebSocket (#3107)
• 63971ed Document HTTP/2 support (#3130)
• 7d1a005 Remove race from multiprocess health check test (#3128)
• 5ac6265 Add ::1 to FORWARDED_ALLOW_IPS (#3119)
• Additional commits viewable in compare view