---
title: "compressResponse"
source: "https://github.com/remix-run/remix/blob/remix@3.0.0/packages/response/src/lib/compress.ts#L90"
---

# compressResponse

## Summary

Compresses a Response based on the client's Accept-Encoding header.

Compression is skipped for:
- Requests with no Accept-Encoding header (RFC 7231)
- Empty responses
- Already compressed responses
- Responses with Content-Length below threshold (default: 1024 bytes)
- Responses with Cache-Control: no-transform
- Responses advertising range support (Accept-Ranges: bytes)
- Partial content responses (206 status)

Responses eligible for content-coding negotiation include `Accept-Encoding` in
the `Vary` header, even when identity is selected or the request does not include
`Accept-Encoding`.

When compressing, this function:
- Sets Content-Encoding header
- Removes Content-Length header
- Sets Accept-Ranges to 'none'
- Converts strong ETags to weak ETags (per RFC 7232)

## Signature

```ts
function compressResponse(
  response: Response,
  request: Request,
  options: CompressResponseOptions,
): Promise<Response>

```

## Parameters

### `response`

The response to compress

### `request`

The request (needed to check Accept-Encoding header)

### `options`

Optional compression settings

## Returns

A response with the negotiated content coding and cache metadata