Merge pull request #495 from http2/nocontentencoding

Removing requirements on Content-Encoding.  Closes #460

draft-ietf-httpbis-http2.xml

@@ -3673,21 +3673,6 @@ HTTP2-Settings    = token68
          <x:ref>INADEQUATE_SECURITY</x:ref>.
        </t>
      </section>

      <section anchor="Compression" title="GZIP Content-Encoding">
        <t>
          Clients MUST support GZIP compression for HTTP response bodies.  Regardless of the value
          of the accept-encoding header field, a server MAY send responses with GZIP encoding.  A
          compressed response MUST still bear an appropriate content-encoding header field.
        </t>
        <t>
          This effectively changes the implicit value of the Accept-Encoding header field (<xref
          target="HTTP-p2" x:fmt="," x:rel="#header.accept-encoding"/>) from "identity" to
          "identity, gzip", however GZIP encoding cannot be suppressed by including ";q=0".
          Intermediaries that perform translation from HTTP/2 to HTTP/1.1 MUST decompress payloads
          unless the request includes an Accept-Encoding value that includes "gzip".
        </t>
      </section>
    </section>

    <section anchor="security" title="Security Considerations">
@@ -4588,7 +4573,11 @@ HTTP2-Settings    = token68
         <t>
           Restored extensibility options.
         </t>
         <t>
           Removing Content-Encoding requirements.
         </t>
       </section>

       <section title="Since draft-ietf-httpbis-http2-11" anchor="changes.since.draft-ietf-httpbis-http2-11">
         <t>
           Added <x:ref>BLOCKED</x:ref> frame (at risk).
@@ -4600,6 +4589,7 @@ HTTP2-Settings    = token68
           Added <x:ref>DATA</x:ref> per-frame GZIP compression.
         </t>
       </section>

       <section title="Since draft-ietf-httpbis-http2-10" anchor="changes.since.draft-ietf-httpbis-http2-10">
        <t>
          Changed "connection header" to "connection preface" to avoid confusion.