Compression Check

What It Does

Makes separate requests with individual Accept-Encoding headers (gzip, br, zstd, deflate, identity) to determine exactly which compression algorithms the server supports. Measures the uncompressed baseline size and each encoding's compressed size to calculate compression ratios. Detects the CDN provider, checks the Vary header for correct caching behavior, and identifies the server's preferred encoding when given a full browser-like Accept-Encoding header.

Why It's Useful

Compression can reduce page size by 60-90% for text-based content. Verifying each encoding individually reveals exactly what the server supports — not just what it prefers. Missing Vary: Accept-Encoding headers can cause CDN cache poisoning, where users receive incorrect compressed/uncompressed responses.

Use Cases

Parameters

Response Fields

Code Examples

curl "https://api.edgedns.dev/v1/domain/compression" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d "domain=example.com"

const response = await fetch(
  'https://api.edgedns.dev/v1/domain/compression?domain=example.com',
  {
    headers: {
      'Authorization': 'Bearer YOUR_API_KEY'
    }
  }
);

const data = await response.json();
console.log(data);

import requests

response = requests.get(
    'https://api.edgedns.dev/v1/domain/compression',
    headers={'Authorization': 'Bearer YOUR_API_KEY'},
    params={
    'domain': 'example.com'
    }
)

data = response.json()
print(data)

Related Endpoints

External References

Learn more about the standards and protocols behind this endpoint.