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

  <section class="description">
    
<p><a href="Response.html"><code>Rack::Response</code></a> provides a convenient interface to create a <a href="../Rack.html"><code>Rack</code></a> response.</p>

<p>It allows setting of headers and cookies, and provides useful defaults (an OK response with empty headers and body).</p>

<p>You can use <a href="Response.html#method-i-write"><code>Response#write</code></a> to iteratively generate your response, but note that this is buffered by <a href="Response.html"><code>Rack::Response</code></a> until you call <code>finish</code>.  <code>finish</code> however can take a block inside which calls to <code>write</code> are synchronous with the <a href="../Rack.html"><code>Rack</code></a> response.</p>

<p>Your application&#39;s <code>call</code> should end returning <a href="Response.html#method-i-finish"><code>Response#finish</code></a>.</p>

  </section>

  
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        <h3>Constants</h3>
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        <dt id="CHUNKED">CHUNKED
        
        <dd>
        
      
        <dt id="STATUS_WITH_NO_ENTITY_BODY">STATUS_WITH_NO_ENTITY_BODY
        
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    <section class="attribute-method-details" class="method-section">
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        <h3>Attributes</h3>
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      <div id="attribute-i-body" class="method-detail">
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     <section id="public-class-5Buntitled-5D-method-details" class="method-section">
       <header>
         <h3>Public Class Methods</h3>
       </header>

    
      <div id="method-c-5B-5D" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">[]</span><span
            class="method-args">(status, headers, body)</span>
          
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        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="5B-5D-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 19</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">[]</span>(<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span>)
  <span class="ruby-keyword">self</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">body</span>, <span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>)
<span class="ruby-keyword">end</span></pre>
          </div>
          
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      <div id="method-c-new" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">new</span><span
            class="method-args">(body = nil, status = 200, headers = {}) { |self| ... }</span>
          
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        <div class="method-description">
          
          <p>Initialize the response object with the specified body, status and headers.</p>

<p>@param body [nil, <a href="Response.html#method-i-each"><code>each</code></a>, to_str] the response body. @param status [Integer] the integer status as defined by the HTTP protocol RFCs. @param headers [#each] a list of key-value header pairs which conform to the HTTP protocol RFCs.</p>

<p>Providing a body which responds to to_str is legacy behaviour.</p>
          
          

          
          <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 42</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">body</span> = <span class="ruby-keyword">nil</span>, <span class="ruby-identifier">status</span> = <span class="ruby-value">200</span>, <span class="ruby-identifier">headers</span> = {})
  <span class="ruby-ivar">@status</span> = <span class="ruby-identifier">status</span>.<span class="ruby-identifier">to_i</span>
  <span class="ruby-ivar">@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-ivar">@writer</span> = <span class="ruby-keyword">self</span>.<span class="ruby-identifier">method</span>(<span class="ruby-value">:append</span>)

  <span class="ruby-ivar">@block</span> = <span class="ruby-keyword">nil</span>

  <span class="ruby-comment"># Keep track of whether we have expanded the user supplied body.</span>
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">body</span>.<span class="ruby-identifier">nil?</span>
    <span class="ruby-ivar">@body</span> = []
    <span class="ruby-ivar">@buffered</span> = <span class="ruby-keyword">true</span>
    <span class="ruby-ivar">@length</span> = <span class="ruby-value">0</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">body</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:to_str</span>)
    <span class="ruby-ivar">@body</span> = [<span class="ruby-identifier">body</span>]
    <span class="ruby-ivar">@buffered</span> = <span class="ruby-keyword">true</span>
    <span class="ruby-ivar">@length</span> = <span class="ruby-identifier">body</span>.<span class="ruby-identifier">to_str</span>.<span class="ruby-identifier">bytesize</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-ivar">@body</span> = <span class="ruby-identifier">body</span>
    <span class="ruby-ivar">@buffered</span> = <span class="ruby-keyword">false</span>
    <span class="ruby-ivar">@length</span> = <span class="ruby-value">0</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-keyword">yield</span> <span class="ruby-keyword">self</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">block_given?</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

    
    </section>
  
     <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
       <header>
         <h3>Public Instance Methods</h3>
       </header>

    
      <div id="method-i-5B-5D" class="method-detail method-alias">
        
        <div class="method-heading">
          <span class="method-name">[]</span><span
            class="method-args">(key)</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
        </div>

        

        
        <div class="aliases">
          Alias for: <a href="Response.html#method-i-get_header">get_header</a>
        </div>
        
      </div>

    
      <div id="method-i-5B-5D-3D" class="method-detail method-alias">
        
        <div class="method-heading">
          <span class="method-name">[]=</span><span
            class="method-args">(key, v)</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
        </div>

        

        
        <div class="aliases">
          Alias for: <a href="Response.html#method-i-set_header">set_header</a>
        </div>
        
      </div>

    
      <div id="method-i-chunked-3F" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">chunked?</span><span
            class="method-args">()</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="chunked-3F-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 73</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">chunked?</span>
  <span class="ruby-constant">CHUNKED</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">get_header</span>(<span class="ruby-constant">TRANSFER_ENCODING</span>)
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

    
      <div id="method-i-close" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">close</span><span
            class="method-args">()</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="close-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 118</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">close</span>
  <span class="ruby-ivar">@body</span>.<span class="ruby-identifier">close</span> <span class="ruby-keyword">if</span> <span class="ruby-ivar">@body</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:close</span>)
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

    
      <div id="method-i-delete_header" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">delete_header</span><span
            class="method-args">(key)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="delete_header-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 129</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">delete_header</span>(<span class="ruby-identifier">key</span>); <span class="ruby-identifier">headers</span>.<span class="ruby-identifier">delete</span> <span class="ruby-identifier">key</span>; <span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

    
      <div id="method-i-each" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">each</span><span
            class="method-args">(&amp;callback)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="each-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 98</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">each</span>(<span class="ruby-operator">&amp;</span><span class="ruby-identifier">callback</span>)
  <span class="ruby-ivar">@body</span>.<span class="ruby-identifier">each</span>(<span class="ruby-operator">&amp;</span><span class="ruby-identifier">callback</span>)
  <span class="ruby-ivar">@buffered</span> = <span class="ruby-keyword">true</span>

  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@block</span>
    <span class="ruby-ivar">@writer</span> = <span class="ruby-identifier">callback</span>
    <span class="ruby-ivar">@block</span>.<span class="ruby-identifier">call</span>(<span class="ruby-keyword">self</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

    
      <div id="method-i-empty-3F" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">empty?</span><span
            class="method-args">()</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="empty-3F-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 122</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">empty?</span>
  <span class="ruby-ivar">@block</span> <span class="ruby-operator">==</span> <span class="ruby-keyword">nil</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@body</span>.<span class="ruby-identifier">empty?</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

    
      <div id="method-i-finish" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">finish</span><span
            class="method-args">(&amp;block)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>
        

        <div class="method-description">
          
          <p>Generate a response array consistent with the requirements of the SPEC. @return [Array] a 3-tuple suitable of `[status, headers, body]` which is suitable to be returned from the middleware `#call(env)` method.</p>
          
          

          
          <div class="method-source-code" id="finish-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 80</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">finish</span>(<span class="ruby-operator">&amp;</span><span class="ruby-identifier">block</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-constant">STATUS_WITH_NO_ENTITY_BODY</span>[<span class="ruby-identifier">status</span>.<span class="ruby-identifier">to_i</span>]
    <span class="ruby-identifier">delete_header</span> <span class="ruby-constant">CONTENT_TYPE</span>
    <span class="ruby-identifier">delete_header</span> <span class="ruby-constant">CONTENT_LENGTH</span>
    <span class="ruby-identifier">close</span>
    <span class="ruby-keyword">return</span> [<span class="ruby-ivar">@status</span>, <span class="ruby-ivar">@headers</span>, []]
  <span class="ruby-keyword">else</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">block_given?</span>
      <span class="ruby-ivar">@block</span> = <span class="ruby-identifier">block</span>
      <span class="ruby-keyword">return</span> [<span class="ruby-ivar">@status</span>, <span class="ruby-ivar">@headers</span>, <span class="ruby-keyword">self</span>]
    <span class="ruby-keyword">else</span>
      <span class="ruby-keyword">return</span> [<span class="ruby-ivar">@status</span>, <span class="ruby-ivar">@headers</span>, <span class="ruby-ivar">@body</span>]
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        
        <div class="aliases">
          Also aliased as: <a href="Response.html#method-i-to_a">to_a</a>
        </div>
        

        
      </div>

    
      <div id="method-i-get_header" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">get_header</span><span
            class="method-args">(key)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="get_header-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 127</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">get_header</span>(<span class="ruby-identifier">key</span>);    <span class="ruby-identifier">headers</span>[<span class="ruby-identifier">key</span>];       <span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        
        <div class="aliases">
          Also aliased as: <a href="Response.html#method-i-5B-5D">[]</a>
        </div>
        

        
      </div>

    
      <div id="method-i-has_header-3F" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">has_header?</span><span
            class="method-args">(key)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="has_header-3F-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 126</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">has_header?</span>(<span class="ruby-identifier">key</span>);   <span class="ruby-identifier">headers</span>.<span class="ruby-identifier">key?</span> <span class="ruby-identifier">key</span>;   <span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

    
      <div id="method-i-redirect" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">redirect</span><span
            class="method-args">(target, status = 302)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="redirect-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 68</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">redirect</span>(<span class="ruby-identifier">target</span>, <span class="ruby-identifier">status</span> = <span class="ruby-value">302</span>)
  <span class="ruby-keyword">self</span>.<span class="ruby-identifier">status</span> = <span class="ruby-identifier">status</span>
  <span class="ruby-keyword">self</span>.<span class="ruby-identifier">location</span> = <span class="ruby-identifier">target</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

    
      <div id="method-i-set_header" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">set_header</span><span
            class="method-args">(key, v)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="set_header-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 128</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">set_header</span>(<span class="ruby-identifier">key</span>, <span class="ruby-identifier">v</span>); <span class="ruby-identifier">headers</span>[<span class="ruby-identifier">key</span>] = <span class="ruby-identifier">v</span>;   <span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        
        <div class="aliases">
          Also aliased as: <a href="Response.html#method-i-5B-5D-3D">[]=</a>
        </div>
        

        
      </div>

    
      <div id="method-i-to_a" class="method-detail method-alias">
        
        <div class="method-heading">
          <span class="method-name">to_a</span><span
            class="method-args">(&amp;block)</span>
          
        </div>
        

        <div class="method-description">
          
          
          
          

          
        </div>

        

        
        <div class="aliases">
          Alias for: <a href="Response.html#method-i-finish">finish</a>
        </div>
        
      </div>

    
      <div id="method-i-write" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">write</span><span
            class="method-args">(chunk)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>
        

        <div class="method-description">
          
          <p>Append to body and update Content-Length.</p>

<p>NOTE: Do not mix <a href="Response.html#method-i-write"><code>write</code></a> and direct <a href="Response.html#attribute-i-body"><code>body</code></a> access!</p>
          
          

          
          <div class="method-source-code" id="write-source">
            <pre><span class="ruby-comment"># File lib/rack/response.rb, line 112</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">write</span>(<span class="ruby-identifier">chunk</span>)
  <span class="ruby-identifier">buffered_body!</span>

  <span class="ruby-ivar">@writer</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">chunk</span>.<span class="ruby-identifier">to_s</span>)
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

    
    </section>
  
  </section>

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