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Response.html
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>class Rack::Response - rack-2.2.10 Documentation</title> <script type="text/javascript"> var rdoc_rel_prefix = "../"; var index_rel_prefix = "../"; </script> <script src="../js/navigation.js" defer></script> <script src="../js/search.js" defer></script> <script src="../js/search_index.js" defer></script> <script src="../js/searcher.js" defer></script> <script src="../js/darkfish.js" defer></script> <link href="../css/fonts.css" rel="stylesheet"> <link href="../css/rdoc.css" rel="stylesheet"> <body id="top" role="document" class="class"> <nav role="navigation"> <div id="project-navigation"> <div id="home-section" role="region" title="Quick navigation" class="nav-section"> <h2> <a href="../index.html" rel="home">Home</a> </h2> <div id="table-of-contents-navigation"> <a href="../table_of_contents.html#pages">Pages</a> <a href="../table_of_contents.html#classes">Classes</a> <a href="../table_of_contents.html#methods">Methods</a> </div> </div> <div id="search-section" role="search" class="project-section initially-hidden"> <form action="#" method="get" accept-charset="utf-8"> <div id="search-field-wrapper"> <input id="search-field" role="combobox" aria-label="Search" aria-autocomplete="list" aria-controls="search-results" type="text" name="search" placeholder="Search" spellcheck="false" title="Type to search, Up and Down to navigate, Enter to load"> </div> <ul id="search-results" aria-label="Search Results" aria-busy="false" aria-expanded="false" aria-atomic="false" class="initially-hidden"></ul> </form> </div> </div> <div id="class-metadata"> <div id="parent-class-section" class="nav-section"> <h3>Parent</h3> <p class="link">Object </div> <div id="includes-section" class="nav-section"> <h3>Included Modules</h3> <ul class="link-list"> <li><a class="include" href="Response/Helpers.html">Rack::Response::Helpers</a> </ul> </div> <!-- Method Quickref --> <div id="method-list-section" class="nav-section"> <h3>Methods</h3> <ul class="link-list" role="directory"> <li ><a href="#method-c-5B-5D">::[]</a> <li ><a href="#method-c-new">::new</a> <li ><a href="#method-i-5B-5D">#[]</a> <li ><a href="#method-i-5B-5D-3D">#[]=</a> <li ><a href="#method-i-chunked-3F">#chunked?</a> <li ><a href="#method-i-close">#close</a> <li ><a href="#method-i-delete_header">#delete_header</a> <li ><a href="#method-i-each">#each</a> <li ><a href="#method-i-empty-3F">#empty?</a> <li ><a href="#method-i-finish">#finish</a> <li ><a href="#method-i-get_header">#get_header</a> <li ><a href="#method-i-has_header-3F">#has_header?</a> <li ><a href="#method-i-redirect">#redirect</a> <li ><a href="#method-i-set_header">#set_header</a> <li ><a href="#method-i-to_a">#to_a</a> <li ><a href="#method-i-write">#write</a> </ul> </div> </div> </nav> <main role="main" aria-labelledby="class-Rack::Response"> <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's <code>call</code> should end returning <a href="Response.html#method-i-finish"><code>Response#finish</code></a>.</p> </section> <section id="5Buntitled-5D" class="documentation-section"> <section class="constants-list"> <header> <h3>Constants</h3> </header> <dl> <dt id="CHUNKED">CHUNKED <dd> <dt id="STATUS_WITH_NO_ENTITY_BODY">STATUS_WITH_NO_ENTITY_BODY <dd> </dl> </section> <section class="attribute-method-details" class="method-section"> <header> <h3>Attributes</h3> </header> <div id="attribute-i-body" class="method-detail"> <div class="method-heading attribute-method-heading"> <span class="method-name">body</span><span class="attribute-access-type">[RW]</span> </div> <div class="method-description"> </div> </div> <div id="attribute-i-header" class="method-detail"> <div class="method-heading attribute-method-heading"> <span class="method-name">header</span><span class="attribute-access-type">[R]</span> </div> <div class="method-description"> </div> </div> <div id="attribute-i-headers" class="method-detail"> <div class="method-heading attribute-method-heading"> <span class="method-name">headers</span><span class="attribute-access-type">[R]</span> </div> <div class="method-description"> </div> </div> <div id="attribute-i-length" class="method-detail"> <div class="method-heading attribute-method-heading"> <span class="method-name">length</span><span class="attribute-access-type">[RW]</span> </div> <div class="method-description"> </div> </div> <div id="attribute-i-status" class="method-detail"> <div class="method-heading attribute-method-heading"> <span class="method-name">status</span><span class="attribute-access-type">[RW]</span> </div> <div class="method-description"> </div> </div> </section> <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> <span class="method-click-advice">click to toggle source</span> </div> <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> </div> </div> <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> <span class="method-click-advice">click to toggle source</span> </div> <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">(&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">&</span><span class="ruby-identifier">callback</span>) <span class="ruby-ivar">@body</span>.<span class="ruby-identifier">each</span>(<span class="ruby-operator">&</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">&&</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">(&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">&</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">(&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> </main> <footer id="validator-badges" role="contentinfo"> <p><a 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