• Correct derive_more dependency feature requirements.

• No significant changes since 4.12.0.

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• actix_web::response::builder::HttpResponseBuilder::streaming() now sets Content-Type to application/octet-stream if Content-Type does not exist.
• actix_web::response::builder::HttpResponseBuilder::streaming() now calls actix_web::response::builder::HttpResponseBuilder::no_chunking() and returns SizedStream if Content-Length is set by user.
• Add ws crate feature (on-by-default) which forwards to actix-http and guards some of its ResponseError impls.
  • ⚠️ if you use default-feature = false and the web scoket feature, please make sure you enable the ws feature.
• Add public export for EitherExtractError in error module.

• Properly wake Payload receivers when feeding errors or EOF.
• Add ServiceConfigBuilder type to facilitate future configuration extensions.
• Add a configuration option to allow/disallow half closed connections in HTTP/1. This defaults to allow, reverting the change made in 3.11.1.
• Shutdown connections when HTTP Responses are written without reading full Requests.

• Fix a bug where GO_AWAY errors did not stop connections from returning to the pool.

• Add Files::with_permanent_redirect() method.
• Change default redirect status code to 307 Temporary Redirect.

• Add hickory-dns crate feature (off-by-default).
• The trust-dns crate feature now delegates DNS resolution to hickory-dns.

• Add {Files, NamedFile}::read_mode_threshold() methods to allow faster synchronous reads of small files.
• Minimum supported Rust version (MSRV) is now 1.75.

• Prevent more hangs after client disconnects.
• More malformed WebSocket frames are now gracefully rejected.
• Using TestRequest::set_payload() now sets a Content-Length header.

• Update brotli dependency to 8.