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  <pre><span class="ruby-comment cmt"># File lib/rack/deflater.rb, line 34</span>
    <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
      <span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span> = <span class="ruby-ivar">@app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
      <span class="ruby-identifier">headers</span> = <span class="ruby-constant">Utils</span><span class="ruby-operator">::</span><span class="ruby-constant">HeaderHash</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">headers</span>)

      <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">should_deflate?</span>(<span class="ruby-identifier">env</span>, <span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span>)
        <span class="ruby-keyword kw">return</span> [<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span>]
      <span class="ruby-keyword kw">end</span>

      <span class="ruby-identifier">request</span> = <span class="ruby-constant">Request</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">env</span>)

      <span class="ruby-identifier">encoding</span> = <span class="ruby-constant">Utils</span>.<span class="ruby-identifier">select_best_encoding</span>(<span class="ruby-node">%w(gzip deflate identity)</span>,
                                            <span class="ruby-identifier">request</span>.<span class="ruby-identifier">accept_encoding</span>)

      <span class="ruby-comment cmt"># Set the Vary HTTP header.</span>
      <span class="ruby-identifier">vary</span> = <span class="ruby-identifier">headers</span>[<span class="ruby-value str">&quot;Vary&quot;</span>].<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">split</span>(<span class="ruby-value str">&quot;,&quot;</span>).<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">v</span><span class="ruby-operator">|</span> <span class="ruby-identifier">v</span>.<span class="ruby-identifier">strip</span> }
      <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">vary</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-value str">&quot;*&quot;</span>) <span class="ruby-operator">||</span> <span class="ruby-identifier">vary</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-value str">&quot;Accept-Encoding&quot;</span>)
        <span class="ruby-identifier">headers</span>[<span class="ruby-value str">&quot;Vary&quot;</span>] = <span class="ruby-identifier">vary</span>.<span class="ruby-identifier">push</span>(<span class="ruby-value str">&quot;Accept-Encoding&quot;</span>).<span class="ruby-identifier">join</span>(<span class="ruby-value str">&quot;,&quot;</span>)
      <span class="ruby-keyword kw">end</span>

      <span class="ruby-keyword kw">case</span> <span class="ruby-identifier">encoding</span>
      <span class="ruby-keyword kw">when</span> <span class="ruby-value str">&quot;gzip&quot;</span>
        <span class="ruby-identifier">headers</span>[<span class="ruby-value str">'Content-Encoding'</span>] = <span class="ruby-value str">&quot;gzip&quot;</span>
        <span class="ruby-identifier">headers</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-constant">CONTENT_LENGTH</span>)
        <span class="ruby-identifier">mtime</span> = <span class="ruby-identifier">headers</span>.<span class="ruby-identifier">key?</span>(<span class="ruby-value str">&quot;Last-Modified&quot;</span>) <span class="ruby-operator">?</span>
          <span class="ruby-constant">Time</span>.<span class="ruby-identifier">httpdate</span>(<span class="ruby-identifier">headers</span>[<span class="ruby-value str">&quot;Last-Modified&quot;</span>]) <span class="ruby-operator">:</span> <span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span>
        [<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-constant">GzipStream</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">body</span>, <span class="ruby-identifier">mtime</span>)]
      <span class="ruby-keyword kw">when</span> <span class="ruby-value str">&quot;deflate&quot;</span>
        <span class="ruby-identifier">headers</span>[<span class="ruby-value str">'Content-Encoding'</span>] = <span class="ruby-value str">&quot;deflate&quot;</span>
        <span class="ruby-identifier">headers</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-constant">CONTENT_LENGTH</span>)
        [<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-constant">DeflateStream</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">body</span>)]
      <span class="ruby-keyword kw">when</span> <span class="ruby-value str">&quot;identity&quot;</span>
        [<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span>]
      <span class="ruby-keyword kw">when</span> <span class="ruby-keyword kw">nil</span>
        <span class="ruby-identifier">message</span> = <span class="ruby-node">&quot;An acceptable encoding for the requested resource #{request.fullpath} could not be found.&quot;</span>
        <span class="ruby-identifier">bp</span> = <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">BodyProxy</span>.<span class="ruby-identifier">new</span>([<span class="ruby-identifier">message</span>]) { <span class="ruby-identifier">body</span>.<span class="ruby-identifier">close</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">body</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-identifier">:close</span>) }
        [<span class="ruby-value">406</span>, {<span class="ruby-constant">CONTENT_TYPE</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value str">&quot;text/plain&quot;</span>, <span class="ruby-constant">CONTENT_LENGTH</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">message</span>.<span class="ruby-identifier">length</span>.<span class="ruby-identifier">to_s</span>}, <span class="ruby-identifier">bp</span>]
      <span class="ruby-keyword kw">end</span>
    <span class="ruby-keyword kw">end</span></pre>
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