pagespeed/ngx_pagespeed — pull request #449 by oschaaf (2013-07-22 10:05:00+00:00)
Title: accept-ranges: Ensure we response with Accept-Ranges: None

Responding with 'Accept-Ranges: None' advices clients not to attempt
range requests, which we don't support for html.

See http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html - 14.5