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  <pre><span class="ruby-comment cmt"># File lib/rack/urlmap.rb, line 43</span>
    <span class="ruby-keyword kw">def</span> <span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
      <span class="ruby-identifier">path</span> = <span class="ruby-identifier">env</span>[<span class="ruby-constant">PATH_INFO</span>]
      <span class="ruby-identifier">script_name</span> = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'SCRIPT_NAME'</span>]
      <span class="ruby-identifier">hHost</span> = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'HTTP_HOST'</span>]
      <span class="ruby-identifier">sName</span> = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'SERVER_NAME'</span>]
      <span class="ruby-identifier">sPort</span> = <span class="ruby-identifier">env</span>[<span class="ruby-value str">'SERVER_PORT'</span>]

      <span class="ruby-ivar">@mapping</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">host</span>, <span class="ruby-identifier">location</span>, <span class="ruby-identifier">match</span>, <span class="ruby-identifier">app</span><span class="ruby-operator">|</span>
        <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">casecmp?</span>(<span class="ruby-identifier">hHost</span>, <span class="ruby-identifier">host</span>) \
            <span class="ruby-operator">||</span> <span class="ruby-identifier">casecmp?</span>(<span class="ruby-identifier">sName</span>, <span class="ruby-identifier">host</span>) \
            <span class="ruby-operator">||</span> (<span class="ruby-operator">!</span><span class="ruby-identifier">host</span> <span class="ruby-operator">&amp;&amp;</span> (<span class="ruby-identifier">casecmp?</span>(<span class="ruby-identifier">hHost</span>, <span class="ruby-identifier">sName</span>) <span class="ruby-operator">||</span>
                          <span class="ruby-identifier">casecmp?</span>(<span class="ruby-identifier">hHost</span>, <span class="ruby-identifier">sName</span><span class="ruby-operator">+</span><span class="ruby-value str">':'</span><span class="ruby-operator">+</span><span class="ruby-identifier">sPort</span>)))
          <span class="ruby-keyword kw">next</span>
        <span class="ruby-keyword kw">end</span>

        <span class="ruby-keyword kw">next</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">m</span> = <span class="ruby-identifier">match</span>.<span class="ruby-identifier">match</span>(<span class="ruby-identifier">path</span>.<span class="ruby-identifier">to_s</span>)

        <span class="ruby-identifier">rest</span> = <span class="ruby-identifier">m</span>[<span class="ruby-value">1</span>]
        <span class="ruby-keyword kw">next</span> <span class="ruby-keyword kw">unless</span> <span class="ruby-operator">!</span><span class="ruby-identifier">rest</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">rest</span>.<span class="ruby-identifier">empty?</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">rest</span>[<span class="ruby-value">0</span>] <span class="ruby-operator">==</span> <span class="ruby-value">?/</span>

        <span class="ruby-identifier">env</span>[<span class="ruby-value str">'SCRIPT_NAME'</span>] = (<span class="ruby-identifier">script_name</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">location</span>)
        <span class="ruby-identifier">env</span>[<span class="ruby-value str">'PATH_INFO'</span>] = <span class="ruby-identifier">rest</span>

        <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
      <span class="ruby-keyword kw">end</span>

      [<span class="ruby-value">404</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-value str">&quot;X-Cascade&quot;</span> =<span class="ruby-operator">&gt;</span> <span class="ruby-value str">&quot;pass&quot;</span>}, [<span class="ruby-node">&quot;Not Found: #{path}&quot;</span>]]

    <span class="ruby-keyword kw">ensure</span>
      <span class="ruby-identifier">env</span>[<span class="ruby-value str">'PATH_INFO'</span>] = <span class="ruby-identifier">path</span>
      <span class="ruby-identifier">env</span>[<span class="ruby-value str">'SCRIPT_NAME'</span>] = <span class="ruby-identifier">script_name</span>
    <span class="ruby-keyword kw">end</span></pre>
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