OnePassApps Site Test: How 21 Accept-Encoding Values Change Compression on 56 Pages

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The OnePassApps team measured its own site's HTTP compression behaviour on 10 November 2026 using plain HTTPS requests with no browser, cookies, or JavaScript. They sent 21 different Accept-Encoding header values to each of the 56 URLs listed in the sitemap, totalling 1,176 requests. Only four of the values produced a compressed response, while the other seventeen returned an uncompressed body, all with HTTP 200 status. The wildcard Accept-Encoding: * was accepted but ignored, returning the full uncompressed 1,361,049 bytes per page. Responses also honoured explicit refusals such as gzip;q=0, and even when identity was excluded the server still answered with the uncompressed body rather than refusing.

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