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  <h1 id="class-Rack::Runtime" class="class">
    class Rack::Runtime
  </h1>

  <section class="description">
    
<p>Sets an “X-Runtime” response header, indicating the response time of the request, in seconds</p>

<p>You can put it right before the application to see the processing time, or before all the other middlewares to include time for them, too.</p>

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         <h3>Public Class Methods</h3>
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          <span class="method-name">new</span><span
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            <pre><span class="ruby-comment"># File lib/rack/runtime.rb, line 14</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">app</span>, <span class="ruby-identifier">name</span> = <span class="ruby-keyword">nil</span>)
  <span class="ruby-ivar">@app</span> = <span class="ruby-identifier">app</span>
  <span class="ruby-ivar">@header_name</span> = <span class="ruby-constant">HEADER_NAME</span>
  <span class="ruby-ivar">@header_name</span> <span class="ruby-operator">+=</span> <span class="ruby-node">&quot;-#{name}&quot;</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">name</span>
<span class="ruby-keyword">end</span></pre>
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          <span class="method-name">call</span><span
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            <pre><span class="ruby-comment"># File lib/rack/runtime.rb, line 20</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">call</span>(<span class="ruby-identifier">env</span>)
  <span class="ruby-identifier">start_time</span> = <span class="ruby-constant">Utils</span>.<span class="ruby-identifier">clock_time</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">headers</span>]

  <span class="ruby-identifier">request_time</span> = <span class="ruby-constant">Utils</span>.<span class="ruby-identifier">clock_time</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">start_time</span>

  <span class="ruby-keyword">unless</span> <span class="ruby-identifier">headers</span>.<span class="ruby-identifier">key?</span>(<span class="ruby-ivar">@header_name</span>)
    <span class="ruby-identifier">headers</span>[<span class="ruby-ivar">@header_name</span>] = <span class="ruby-constant">FORMAT_STRING</span> <span class="ruby-operator">%</span> <span class="ruby-identifier">request_time</span>
  <span class="ruby-keyword">end</span>

  [<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span>]
<span class="ruby-keyword">end</span></pre>
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