HTTP Compression Checker MCP tool

Checks which HTTP compression a URL is served with: gzip, Brotli (br) and Zstandard (zstd), and how many bytes each one saves. Downloads the URL once uncompressed (Accept-Encoding: identity), following up to 5 redirects, then once for each encoding at the final URL, and compares the sizes of the bodies as sent. url is an http or https URL (https:// is assumed without a scheme) on a public host, on port 80, 443, 8080 or 8443. Returns url (the final URL, after redirects), redirects (how many were followed), statusCode, contentType, uncompressedBytes, varyAcceptEncoding (whether a compressed answer sends Vary: Accept-Encoding, which caches need to keep the versions apart; null when no encoding is supported) and encodings: for gzip, br and zstd, supported (the server answered with that encoding; null when the request failed), bytes (the compressed size; null when not supported) and savedPercent (how much smaller than uncompressed, one decimal). Bodies are read up to 5 MiB; truncated is true when the uncompressed body was longer, and then uncompressedBytes is 5 MiB and savedPercent null. Fails when the URL can't be fetched, isn't public, answers with a status other than 2xx or keeps redirecting.

• urlstring · Required
  URL of the page or file to check (http or https; https:// is assumed when no scheme is given). The host must be public, and only ports 80, 443, 8080 and 8443 can be fetched.
  Up to 2048 characters

Every request needs an API token, which you can create in your account and send as a Bearer token in the Authorization header.