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.htaccess Fix broken AcceptEncoding Headers

Fix broken AcceptEncoding Headers​

Some proxies and security software mangle or strip the Accept-Encoding HTTP header.

<IfModule mod_deflate.c>
  <IfModule mod_setenvif.c>
    <IfModule mod_headers.c>
      SetEnvIfNoCase ^(Accept-EncodXng|X-cept-Encoding|X{15}|~{15}|-{15})$ ^((gzip|deflate)\s*,?\s*)+|[X~-]{4,13}$ HAVE_Accept-Encoding
      RequestHeader append Accept-Encoding "gzip,deflate" env=HAVE_Accept-Encoding
    </IfModule>
  </IfModule>
</IfModule>

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