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  <pre><span class="ruby-comment cmt"># File lib/rack/showstatus.rb, line 19</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-identifier">empty</span> = <span class="ruby-identifier">headers</span>[<span class="ruby-constant">CONTENT_LENGTH</span>].<span class="ruby-identifier">to_i</span> <span class="ruby-operator">&lt;=</span> <span class="ruby-value">0</span>

      <span class="ruby-comment cmt"># client or server error, or explicit message</span>
      <span class="ruby-keyword kw">if</span> (<span class="ruby-identifier">status</span>.<span class="ruby-identifier">to_i</span> <span class="ruby-operator">&gt;=</span> <span class="ruby-value">400</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">empty</span>) <span class="ruby-operator">||</span> <span class="ruby-identifier">env</span>[<span class="ruby-value str">&quot;rack.showstatus.detail&quot;</span>]
        <span class="ruby-comment cmt"># This double assignment is to prevent an &quot;unused variable&quot; warning on</span>
        <span class="ruby-comment cmt"># Ruby 1.9.3.  Yes, it is dumb, but I don't like Ruby yelling at me.</span>
        <span class="ruby-identifier">req</span> = <span class="ruby-identifier">req</span> = <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Request</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">env</span>)

        <span class="ruby-identifier">message</span> = <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Utils</span><span class="ruby-operator">::</span><span class="ruby-constant">HTTP_STATUS_CODES</span>[<span class="ruby-identifier">status</span>.<span class="ruby-identifier">to_i</span>] <span class="ruby-operator">||</span> <span class="ruby-identifier">status</span>.<span class="ruby-identifier">to_s</span>

        <span class="ruby-comment cmt"># This double assignment is to prevent an &quot;unused variable&quot; warning on</span>
        <span class="ruby-comment cmt"># Ruby 1.9.3.  Yes, it is dumb, but I don't like Ruby yelling at me.</span>
        <span class="ruby-identifier">detail</span> = <span class="ruby-identifier">detail</span> = <span class="ruby-identifier">env</span>[<span class="ruby-value str">&quot;rack.showstatus.detail&quot;</span>] <span class="ruby-operator">||</span> <span class="ruby-identifier">message</span>

        <span class="ruby-identifier">body</span> = <span class="ruby-ivar">@template</span>.<span class="ruby-identifier">result</span>(<span class="ruby-identifier">binding</span>)
        <span class="ruby-identifier">size</span> = <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Utils</span>.<span class="ruby-identifier">bytesize</span>(<span class="ruby-identifier">body</span>)
        [<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>.<span class="ruby-identifier">merge</span>(<span class="ruby-constant">CONTENT_TYPE</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value str">&quot;text/html&quot;</span>, <span class="ruby-constant">CONTENT_LENGTH</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-identifier">size</span>.<span class="ruby-identifier">to_s</span>), [<span class="ruby-identifier">body</span>]]
      <span class="ruby-keyword kw">else</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-keyword kw">end</span></pre>
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