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Editing: Handler.html

<!DOCTYPE html>

<title>module Rack::Handler - rack-2.2.22 Documentation</title>

<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>

<div id="class-metadata">
    
    
    
    
    
<div id="method-list-section" class="nav-section">
  <h3>Methods</h3>

<ul class="link-list" role="directory">
    
    <li ><a href="#method-c-default">::default</a>
    
    <li ><a href="#method-c-get">::get</a>
    
    <li ><a href="#method-c-pick">::pick</a>
    
    <li ><a href="#method-c-register">::register</a>
    
    <li ><a href="#method-c-try_require">::try_require</a>
    
  </ul>
</div>

</div>
</nav>

<main role="main" aria-labelledby="module-Rack::Handler">
  <h1 id="module-Rack::Handler" class="module">
    module Rack::Handler
  </h1>

<section class="description">
    
<p><strong>Handlers</strong> connect web servers with <a href="../Rack.html"><code>Rack</code></a>.</p>

<p><a href="../Rack.html"><code>Rack</code></a> includes Handlers for <a href="Handler/Thin.html"><code>Thin</code></a>, <a href="Handler/WEBrick.html"><code>WEBrick</code></a>, <a href="Handler/FastCGI.html"><code>FastCGI</code></a>, <a href="Handler/CGI.html"><code>CGI</code></a>, <a href="Handler/SCGI.html"><code>SCGI</code></a> and LiteSpeed.</p>

<p>Handlers usually are activated by calling <code>MyHandler.run(myapp)</code>. A second optional hash can be passed to include server-specific configuration.</p>

</section>

<section class="constants-list">
      <header>
        <h3>Constants</h3>
      </header>
      <dl>
      
        <dt id="SERVER_NAMES">SERVER_NAMES
        
        <dd>
        
      
      </dl>
    </section>

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

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

<div class="method-source-code" id="default-source">
            <pre><span class="ruby-comment"># File lib/rack/handler.rb, line 51</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">default</span>
  <span class="ruby-comment"># Guess.</span>
  <span class="ruby-keyword">if</span> <span class="ruby-constant">ENV</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-string">&quot;PHP_FCGI_CHILDREN&quot;</span>)
    <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Handler</span><span class="ruby-operator">::</span><span class="ruby-constant">FastCGI</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-constant">ENV</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-constant">REQUEST_METHOD</span>)
    <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Handler</span><span class="ruby-operator">::</span><span class="ruby-constant">CGI</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-constant">ENV</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-string">&quot;RACK_HANDLER&quot;</span>)
    <span class="ruby-keyword">self</span>.<span class="ruby-identifier">get</span>(<span class="ruby-constant">ENV</span>[<span class="ruby-string">&quot;RACK_HANDLER&quot;</span>])
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">pick</span> <span class="ruby-constant">SERVER_NAMES</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

</div>

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

<div class="method-source-code" id="get-source">
            <pre><span class="ruby-comment"># File lib/rack/handler.rb, line 13</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">get</span>(<span class="ruby-identifier">server</span>)
  <span class="ruby-keyword">return</span> <span class="ruby-keyword">unless</span> <span class="ruby-identifier">server</span>
  <span class="ruby-identifier">server</span> = <span class="ruby-identifier">server</span>.<span class="ruby-identifier">to_s</span>

<span class="ruby-keyword">unless</span> <span class="ruby-ivar">@handlers</span>.<span class="ruby-identifier">include?</span> <span class="ruby-identifier">server</span>
    <span class="ruby-identifier">load_error</span> = <span class="ruby-identifier">try_require</span>(<span class="ruby-string">&#39;rack/handler&#39;</span>, <span class="ruby-identifier">server</span>)
  <span class="ruby-keyword">end</span>

<span class="ruby-keyword">if</span> <span class="ruby-identifier">klass</span> = <span class="ruby-ivar">@handlers</span>[<span class="ruby-identifier">server</span>]
    <span class="ruby-identifier">const_get</span>(<span class="ruby-identifier">klass</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">const_get</span>(<span class="ruby-identifier">server</span>, <span class="ruby-keyword">false</span>)
  <span class="ruby-keyword">end</span>

<span class="ruby-keyword">rescue</span> <span class="ruby-constant">NameError</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">name_error</span>
  <span class="ruby-identifier">raise</span> <span class="ruby-identifier">load_error</span> <span class="ruby-operator">||</span> <span class="ruby-identifier">name_error</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

</div>

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

<div class="method-description">
          
          <p>Select first available <a href="../Rack.html"><code>Rack</code></a> handler given an `Array` of server names. Raises `LoadError` if no handler was found.</p>

<pre>&gt; pick [&#39;thin&#39;, &#39;webrick&#39;]
=&gt; Rack::Handler::WEBrick</pre>

<div class="method-source-code" id="pick-source">
            <pre><span class="ruby-comment"># File lib/rack/handler.rb, line 36</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">pick</span>(<span class="ruby-identifier">server_names</span>)
  <span class="ruby-identifier">server_names</span> = <span class="ruby-constant">Array</span>(<span class="ruby-identifier">server_names</span>)
  <span class="ruby-identifier">server_names</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">server_name</span><span class="ruby-operator">|</span>
    <span class="ruby-keyword">begin</span>
      <span class="ruby-keyword">return</span> <span class="ruby-identifier">get</span>(<span class="ruby-identifier">server_name</span>.<span class="ruby-identifier">to_s</span>)
    <span class="ruby-keyword">rescue</span> <span class="ruby-constant">LoadError</span>, <span class="ruby-constant">NameError</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

<span class="ruby-identifier">raise</span> <span class="ruby-constant">LoadError</span>, <span class="ruby-node">&quot;Couldn&#39;t find handler for: #{server_names.join(&#39;, &#39;)}.&quot;</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

</div>

<div id="method-c-register" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">register</span><span
            class="method-args">(server, klass)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>

<div class="method-source-code" id="register-source">
            <pre><span class="ruby-comment"># File lib/rack/handler.rb, line 85</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">register</span>(<span class="ruby-identifier">server</span>, <span class="ruby-identifier">klass</span>)
  <span class="ruby-ivar">@handlers</span> <span class="ruby-operator">||=</span> {}
  <span class="ruby-ivar">@handlers</span>[<span class="ruby-identifier">server</span>.<span class="ruby-identifier">to_s</span>] = <span class="ruby-identifier">klass</span>.<span class="ruby-identifier">to_s</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

</div>

<div id="method-c-try_require" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">try_require</span><span
            class="method-args">(prefix, const_name)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>

<div class="method-description">
          
          <p>Transforms server-name constants to their canonical form as filenames, then tries to require them but silences the LoadError if not found</p>

<p>Naming convention:</p>

<pre class="ruby"><span class="ruby-constant">Foo</span> <span class="ruby-comment"># =&gt; &#39;foo&#39;</span>
<span class="ruby-constant">FooBar</span> <span class="ruby-comment"># =&gt; &#39;foo_bar.rb&#39;</span>
<span class="ruby-constant">FooBAR</span> <span class="ruby-comment"># =&gt; &#39;foobar.rb&#39;</span>
<span class="ruby-constant">FOObar</span> <span class="ruby-comment"># =&gt; &#39;foobar.rb&#39;</span>
<span class="ruby-constant">FOOBAR</span> <span class="ruby-comment"># =&gt; &#39;foobar.rb&#39;</span>
<span class="ruby-constant">FooBarBaz</span> <span class="ruby-comment"># =&gt; &#39;foo_bar_baz.rb&#39;</span>
</pre>

<div class="method-source-code" id="try_require-source">
            <pre><span class="ruby-comment"># File lib/rack/handler.rb, line 75</span>
<span class="ruby-keyword">def</span> <span class="ruby-keyword">self</span>.<span class="ruby-identifier ruby-title">try_require</span>(<span class="ruby-identifier">prefix</span>, <span class="ruby-identifier">const_name</span>)
  <span class="ruby-identifier">file</span> = <span class="ruby-identifier">const_name</span>.<span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">/^[A-Z]+/</span>) { <span class="ruby-operator">|</span><span class="ruby-identifier">pre</span><span class="ruby-operator">|</span> <span class="ruby-identifier">pre</span>.<span class="ruby-identifier">downcase</span> }.
    <span class="ruby-identifier">gsub</span>(<span class="ruby-regexp">/[A-Z]+[^A-Z]/</span>, <span class="ruby-string">&#39;_\&amp;&#39;</span>).<span class="ruby-identifier">downcase</span>

<span class="ruby-identifier">require</span>(<span class="ruby-operator">::</span><span class="ruby-constant">File</span>.<span class="ruby-identifier">join</span>(<span class="ruby-identifier">prefix</span>, <span class="ruby-identifier">file</span>))
  <span class="ruby-keyword">nil</span>
<span class="ruby-keyword">rescue</span> <span class="ruby-constant">LoadError</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">error</span>
  <span class="ruby-identifier">error</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

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