HTTP compression checker
Checks whether a URL is served gzip/brotli compressed, with the real Content-Encoding and wire size the server sent.
1 · Input
What is checked
A request that explicitly advertises gzip, deflate and br support, with this checker's own client never auto-decompressing the response - so the reported Content-Encoding and byte size reflect exactly what the server sent over the wire. MIME types that typically benefit from compression (text, JSON, JavaScript, SVG) versus ones that usually do not (already-compressed images and video) are treated differently in the findings.
Bounded
Response bodies are read up to a fixed size cap - this checks one URL's compression, not an unbounded download.
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