Crate http_response_compression 

HTTP response compression middleware for Tower.

This crate provides a Tower layer that automatically compresses HTTP response bodies using Zstd, Brotli, Gzip, or Deflate based on the client’s Accept-Encoding header.

Example

use http_response_compression::CompressionLayer;
use tower::ServiceBuilder;

let service = ServiceBuilder::new()
    .layer(CompressionLayer::new())
    .service(my_service);

Compression Rules

The middleware will not compress responses when:

• No supported Accept-Encoding is present in the request
• Content-Encoding header is already set
• Content-Range header is present (range responses)
• Content-Type starts with image/ (except image/svg+xml)
• Content-Type starts with application/grpc (except application/grpc-web)
• Content-Length is below the minimum size threshold (default: 860 bytes)

The middleware will always flush after each chunk when:

• X-Accel-Buffering: no header is present
• Content-Type is text/event-stream
• Content-Type starts with application/grpc-web

Response Modifications

When compression is applied:

• Content-Encoding header is set to the codec used
• Content-Length header is removed (compressed size is unknown)
• Accept-Ranges header is removed
• Vary header includes Accept-Encoding

Structs

CompressionLayer

A Tower layer that compresses HTTP response bodies.

CompressionService

A Tower service that compresses HTTP response bodies.

ResponseFuture

Future for compression service responses.

Enums

CompressionBody

A response body that may be compressed.