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Update ETags tables with zstd #26247

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Nov 4, 2025
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Update ETags tables with zstd #26247

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8 changes: 8 additions & 0 deletions src/content/docs/cache/reference/etag-headers.mdx
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Expand Up @@ -44,6 +44,9 @@ The Cloudflare network will take the following actions, depending on the visitor
| `br` | GZIP | Decompress GZIP and return uncompressed response to visitor with weak ETag header: `etag: W/"foobar"`. |
| `gzip` | Brotli | Decompress Brotli and return uncompressed response to visitor with weak ETag header: `etag: W/"foobar"`. |
| `gzip` | (none) | Return uncompressed response to visitor with strong ETag header: `etag: "foobar"`. |
| `gzip, br, zstd` | Zstandard | Return zstd-compressed response to visitor with strong ETag header: `etag: "foobar"`.
| `gzip, br` | Zstandard | Decompress zstd and return br response to visitor with weak ETag header: `etag: W/"foobar"`.
| `zstd` | Brotli/GZIP | Decompress zstd and return zstd response to visitor with weak ETag header: `etag: W/"foobar"`. |

</table-wrap>

Expand Down Expand Up @@ -74,9 +77,14 @@ The Cloudflare network will take the following actions, depending on the visitor
| `br` | GZIP | Decompress GZIP and return Brotli-compressed response to visitor with weak ETag header: `etag: W/"foobar"`. |
| `gzip` | Brotli | Decompress Brotli and return GZIP-compressed response to visitor with weak ETag header: `etag: W/"foobar"`. |
| `gzip` | (none) | Compress origin response using GZIP and return it to visitor with weak ETag header: `etag: W/"foobar"`. |
| `gzip, br, zstd` | Zstandard | Return zstd-compressed response to visitor with strong ETag header: `etag: "foobar"`. |
| `gzip, br` | Zstandard | Decompress zstd and return uncompressed response to visitor with weak ETag header: `etag: W/"foobar"`. |
| `zstd` | Brotli | Decompress zstd and return uncompressed response to visitor with weak ETag header: `etag: W/"foobar"`. |

</table-wrap>

Refer to [Content compression](/speed/optimization/content/compression/) for more information.

## Important remarks

* You must set the value in a strong ETag header using double quotes (for example, `etag: "foobar"`). If you use an incorrect format, Cloudflare will remove the ETag header instead of converting it to a weak ETag. 
Expand Down