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  <title>serving (Rack::File)</title>
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  <pre><span class="ruby-comment cmt"># File lib/rack/file.rb, line 59</span>
    <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">serving</span>(<span class="ruby-identifier">env</span>)
      <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">env</span>[<span class="ruby-value str">&quot;REQUEST_METHOD&quot;</span>] <span class="ruby-operator">==</span> <span class="ruby-value str">&quot;OPTIONS&quot;</span>
        <span class="ruby-keyword kw">return</span> [<span class="ruby-value">200</span>, {<span class="ruby-value str">'Allow'</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-constant">ALLOW_HEADER</span>, <span class="ruby-constant">CONTENT_LENGTH</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value str">'0'</span>}, []]
      <span class="ruby-keyword kw">end</span>
      <span class="ruby-identifier">last_modified</span> = <span class="ruby-constant">F</span>.<span class="ruby-identifier">mtime</span>(<span class="ruby-ivar">@path</span>).<span class="ruby-identifier">httpdate</span>
      <span class="ruby-keyword kw">return</span> [<span class="ruby-value">304</span>, {}, []] <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">env</span>[<span class="ruby-value str">'HTTP_IF_MODIFIED_SINCE'</span>] <span class="ruby-operator">==</span> <span class="ruby-identifier">last_modified</span>

      <span class="ruby-identifier">headers</span> = { <span class="ruby-value str">&quot;Last-Modified&quot;</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">last_modified</span> }
      <span class="ruby-identifier">headers</span>[<span class="ruby-constant">CONTENT_TYPE</span>] = <span class="ruby-identifier">mime_type</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">mime_type</span>

      <span class="ruby-comment cmt"># Set custom headers</span>
      <span class="ruby-ivar">@headers</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">field</span>, <span class="ruby-identifier">content</span><span class="ruby-operator">|</span> <span class="ruby-identifier">headers</span>[<span class="ruby-identifier">field</span>] = <span class="ruby-identifier">content</span> } <span class="ruby-keyword kw">if</span> <span class="ruby-ivar">@headers</span>

      <span class="ruby-identifier">response</span> = [ <span class="ruby-value">200</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">env</span>[<span class="ruby-constant">REQUEST_METHOD</span>] <span class="ruby-operator">==</span> <span class="ruby-value str">&quot;HEAD&quot;</span> <span class="ruby-operator">?</span> [] <span class="ruby-operator">:</span> <span class="ruby-keyword kw">self</span> ]

      <span class="ruby-identifier">size</span> = <span class="ruby-identifier">filesize</span>

      <span class="ruby-identifier">ranges</span> = <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Utils</span>.<span class="ruby-identifier">byte_ranges</span>(<span class="ruby-identifier">env</span>, <span class="ruby-identifier">size</span>)
      <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">ranges</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">ranges</span>.<span class="ruby-identifier">length</span> <span class="ruby-operator">&gt;</span> <span class="ruby-value">1</span>
        <span class="ruby-comment cmt"># No ranges, or multiple ranges (which we don't support):</span>
        <span class="ruby-comment cmt"># TODO: Support multiple byte-ranges</span>
        <span class="ruby-identifier">response</span>[<span class="ruby-value">0</span>] = <span class="ruby-value">200</span>
        <span class="ruby-ivar">@range</span> = <span class="ruby-value">0</span><span class="ruby-operator">..</span><span class="ruby-identifier">size</span><span class="ruby-operator">-</span><span class="ruby-value">1</span>
      <span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">ranges</span>.<span class="ruby-identifier">empty?</span>
        <span class="ruby-comment cmt"># Unsatisfiable. Return error, and file size:</span>
        <span class="ruby-identifier">response</span> = <span class="ruby-identifier">fail</span>(<span class="ruby-value">416</span>, <span class="ruby-value str">&quot;Byte range unsatisfiable&quot;</span>)
        <span class="ruby-identifier">response</span>[<span class="ruby-value">1</span>][<span class="ruby-value str">&quot;Content-Range&quot;</span>] = <span class="ruby-node">&quot;bytes */#{size}&quot;</span>
        <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">response</span>
      <span class="ruby-keyword kw">else</span>
        <span class="ruby-comment cmt"># Partial content:</span>
        <span class="ruby-ivar">@range</span> = <span class="ruby-identifier">ranges</span>[<span class="ruby-value">0</span>]
        <span class="ruby-identifier">response</span>[<span class="ruby-value">0</span>] = <span class="ruby-value">206</span>
        <span class="ruby-identifier">response</span>[<span class="ruby-value">1</span>][<span class="ruby-value str">&quot;Content-Range&quot;</span>] = <span class="ruby-node">&quot;bytes #{@range.begin}-#{@range.end}/#{size}&quot;</span>
        <span class="ruby-identifier">size</span> = <span class="ruby-ivar">@range</span>.<span class="ruby-identifier">end</span> <span class="ruby-operator">-</span> <span class="ruby-ivar">@range</span>.<span class="ruby-identifier">begin</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span>
      <span class="ruby-keyword kw">end</span>

      <span class="ruby-identifier">response</span>[<span class="ruby-value">2</span>] = [<span class="ruby-identifier">response_body</span>] <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">response_body</span>.<span class="ruby-identifier">nil?</span>

      <span class="ruby-identifier">response</span>[<span class="ruby-value">1</span>][<span class="ruby-constant">CONTENT_LENGTH</span>] = <span class="ruby-identifier">size</span>.<span class="ruby-identifier">to_s</span>
      <span class="ruby-identifier">response</span>
    <span class="ruby-keyword kw">end</span></pre>
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