HTTP headers
Accept-Encoding HTTP Header Meaning
Accept-Encoding tells the server which compression formats the client supports.
Meaning
The client is saying it can decode encodings such as gzip, br, or zstd.
Where it appears
Browsers send it on most requests so servers and CDNs can compress responses.
What to check
Check Content-Encoding on the response and whether cached variants vary by Accept-Encoding.
Example
Accept-Encoding: gzip, br