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  <h3>Methods</h3>

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    <li ><a href="#method-c-new">::new</a>
    
    <li ><a href="#method-i-add_index_root-3F">#add_index_root?</a>
    
    <li ><a href="#method-i-applicable_rules">#applicable_rules</a>
    
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  <h1 id="class-Rack::Static" class="class">
    class Rack::Static
  </h1>

  <section class="description">
    
<p>The <a href="Static.html"><code>Rack::Static</code></a> middleware intercepts requests for static files (javascript files, images, stylesheets, etc) based on the url prefixes or route mappings passed in the options, and serves them using a <a href="Files.html"><code>Rack::Files</code></a> object. This allows a <a href="../Rack.html"><code>Rack</code></a> stack to serve both static and dynamic content.</p>

<p>Examples:</p>

<p>Serve all requests beginning with /media from the “media” folder located in the current directory (ie media/*):</p>

<pre class="ruby"><span class="ruby-identifier">use</span> <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Static</span>, <span class="ruby-value">:urls</span> <span class="ruby-operator">=&gt;</span> [<span class="ruby-string">&quot;/media&quot;</span>]
</pre>

<p>Same as previous, but instead of returning 404 for missing files under /media, call the next middleware:</p>

<pre class="ruby"><span class="ruby-identifier">use</span> <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Static</span>, <span class="ruby-value">:urls</span> <span class="ruby-operator">=&gt;</span> [<span class="ruby-string">&quot;/media&quot;</span>], <span class="ruby-value">:cascade</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-keyword">true</span>
</pre>

<p>Serve all requests beginning with /css or /images from the folder “public” in the current directory (ie public/css/* and public/images/*):</p>

<pre class="ruby"><span class="ruby-identifier">use</span> <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Static</span>, <span class="ruby-value">:urls</span> <span class="ruby-operator">=&gt;</span> [<span class="ruby-string">&quot;/css&quot;</span>, <span class="ruby-string">&quot;/images&quot;</span>], <span class="ruby-value">:root</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-string">&quot;public&quot;</span>
</pre>

<p>Serve all requests to / with “index.html” from the folder “public” in the current directory (ie public/index.html):</p>

<pre class="ruby"><span class="ruby-identifier">use</span> <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Static</span>, <span class="ruby-value">:urls</span> <span class="ruby-operator">=&gt;</span> {<span class="ruby-string">&quot;/&quot;</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-string">&#39;index.html&#39;</span>}, <span class="ruby-value">:root</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-string">&#39;public&#39;</span>
</pre>

<p>Serve all requests normally from the folder “public” in the current directory but uses index.html as default route for “/”</p>

<pre class="ruby"><span class="ruby-identifier">use</span> <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Static</span>, <span class="ruby-value">:urls</span> <span class="ruby-operator">=&gt;</span> [<span class="ruby-string">&quot;&quot;</span>], <span class="ruby-value">:root</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-string">&#39;public&#39;</span>, <span class="ruby-value">:index</span> <span class="ruby-operator">=&gt;</span>
<span class="ruby-string">&#39;index.html&#39;</span>
</pre>

<p>Set custom HTTP Headers for based on rules:</p>

<pre>   use Rack::Static, :root =&gt; &#39;public&#39;,
       :header_rules =&gt; [
         [rule, {header_field =&gt; content, header_field =&gt; content}],
         [rule, {header_field =&gt; content}]
       ]

Rules for selecting files:

1) All files
   Provide the :all symbol
   :all =&gt; Matches every file

2) Folders
   Provide the folder path as a string
   &#39;/folder&#39; or &#39;/folder/subfolder&#39; =&gt; Matches files in a certain folder

3) File Extensions
   Provide the file extensions as an array
   [&#39;css&#39;, &#39;js&#39;] or %w(css js) =&gt; Matches files ending in .css or .js

4) Regular Expressions / Regexp
   Provide a regular expression
   %r{\.(?:css|js)\z} =&gt; Matches files ending in .css or .js
   /\.(?:eot|ttf|otf|woff2|woff|svg)\z/ =&gt; Matches files ending in
     the most common web font formats (.eot, .ttf, .otf, .woff2, .woff, .svg)
     Note: This Regexp is available as a shortcut, using the :fonts rule

5) Font Shortcut
   Provide the :fonts symbol
   :fonts =&gt; Uses the Regexp rule stated right above to match all common web font endings

Rule Ordering:
  Rules are applied in the order that they are provided.
  List rather general rules above special ones.

Complete example use case including HTTP header rules:

   use Rack::Static, :root =&gt; &#39;public&#39;,
       :header_rules =&gt; [
         # Cache all static files in public caches (e.g. Rack::Cache)
         #  as well as in the browser
         [:all, {&#39;Cache-Control&#39; =&gt; &#39;public, max-age=31536000&#39;}],

         # Provide web fonts with cross-origin access-control-headers
         #  Firefox requires this when serving assets using a Content Delivery Network
         [:fonts, {&#39;Access-Control-Allow-Origin&#39; =&gt; &#39;*&#39;}]
       ]</pre>

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  <section id="5Buntitled-5D" class="documentation-section">
    

    

    

    

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

    
      <div id="method-c-new" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">new</span><span
            class="method-args">(app, options = {})</span>
          
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        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File lib/rack/static.rb, line 91</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">options</span> = {})
  <span class="ruby-ivar">@app</span> = <span class="ruby-identifier">app</span>
  <span class="ruby-ivar">@urls</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:urls</span>] <span class="ruby-operator">||</span> [<span class="ruby-string">&quot;/favicon.ico&quot;</span>]
  <span class="ruby-ivar">@index</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:index</span>]
  <span class="ruby-ivar">@gzip</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:gzip</span>]
  <span class="ruby-ivar">@cascade</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:cascade</span>]
  <span class="ruby-identifier">root</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:root</span>] <span class="ruby-operator">||</span> <span class="ruby-constant">Dir</span>.<span class="ruby-identifier">pwd</span>

  <span class="ruby-comment"># HTTP Headers</span>
  <span class="ruby-ivar">@header_rules</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:header_rules</span>] <span class="ruby-operator">||</span> []
  <span class="ruby-comment"># Allow for legacy :cache_control option while prioritizing global header_rules setting</span>
  <span class="ruby-ivar">@header_rules</span>.<span class="ruby-identifier">unshift</span>([<span class="ruby-value">:all</span>, { <span class="ruby-constant">CACHE_CONTROL</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:cache_control</span>] }]) <span class="ruby-keyword">if</span> <span class="ruby-identifier">options</span>[<span class="ruby-value">:cache_control</span>]

  <span class="ruby-ivar">@file_server</span> = <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Files</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">root</span>)
<span class="ruby-keyword">end</span></pre>
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    </section>
  
     <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
       <header>
         <h3>Public Instance Methods</h3>
       </header>

    
      <div id="method-i-add_index_root-3F" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">add_index_root?</span><span
            class="method-args">(path)</span>
          
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          <div class="method-source-code" id="add_index_root-3F-source">
            <pre><span class="ruby-comment"># File lib/rack/static.rb, line 107</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">add_index_root?</span>(<span class="ruby-identifier">path</span>)
  <span class="ruby-ivar">@index</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">route_file</span>(<span class="ruby-identifier">path</span>) <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">path</span>.<span class="ruby-identifier">end_with?</span>(<span class="ruby-string">&#39;/&#39;</span>)
<span class="ruby-keyword">end</span></pre>
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      <div id="method-i-applicable_rules" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">applicable_rules</span><span
            class="method-args">(path)</span>
          
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        <div class="method-description">
          
          <p>Convert HTTP header rules to HTTP headers</p>
          
          

          
          <div class="method-source-code" id="applicable_rules-source">
            <pre><span class="ruby-comment"># File lib/rack/static.rb, line 166</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">applicable_rules</span>(<span class="ruby-identifier">path</span>)
  <span class="ruby-ivar">@header_rules</span>.<span class="ruby-identifier">find_all</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">rule</span>, <span class="ruby-identifier">new_headers</span><span class="ruby-operator">|</span>
    <span class="ruby-keyword">case</span> <span class="ruby-identifier">rule</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:all</span>
      <span class="ruby-keyword">true</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:fonts</span>
      <span class="ruby-regexp">/\.(?:ttf|otf|eot|woff2|woff|svg)\z/</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-identifier">path</span>)
    <span class="ruby-keyword">when</span> <span class="ruby-constant">String</span>
      <span class="ruby-identifier">path</span> = <span class="ruby-operator">::</span><span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Utils</span>.<span class="ruby-identifier">unescape</span>(<span class="ruby-identifier">path</span>)
      <span class="ruby-identifier">path</span>.<span class="ruby-identifier">start_with?</span>(<span class="ruby-identifier">rule</span>) <span class="ruby-operator">||</span> <span class="ruby-identifier">path</span>.<span class="ruby-identifier">start_with?</span>(<span class="ruby-string">&#39;/&#39;</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">rule</span>)
    <span class="ruby-keyword">when</span> <span class="ruby-constant">Array</span>
      <span class="ruby-regexp">/\.(#{rule.join(&#39;|&#39;)})\z/</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-identifier">path</span>)
    <span class="ruby-keyword">when</span> <span class="ruby-constant">Regexp</span>
      <span class="ruby-identifier">rule</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-identifier">path</span>)
    <span class="ruby-keyword">else</span>
      <span class="ruby-keyword">false</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
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      <div id="method-i-call" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">call</span><span
            class="method-args">(env)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
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        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="call-source">
            <pre><span class="ruby-comment"># File lib/rack/static.rb, line 123</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">path</span> = <span class="ruby-identifier">env</span>[<span class="ruby-constant">PATH_INFO</span>]

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">can_serve</span>(<span class="ruby-identifier">path</span>)
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">overwrite_file_path</span>(<span class="ruby-identifier">path</span>)
      <span class="ruby-identifier">env</span>[<span class="ruby-constant">PATH_INFO</span>] = (<span class="ruby-identifier">add_index_root?</span>(<span class="ruby-identifier">path</span>) <span class="ruby-operator">?</span> <span class="ruby-identifier">path</span> <span class="ruby-operator">+</span> <span class="ruby-ivar">@index</span> <span class="ruby-operator">:</span> <span class="ruby-ivar">@urls</span>[<span class="ruby-identifier">path</span>])
    <span class="ruby-keyword">elsif</span> <span class="ruby-ivar">@gzip</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">env</span>[<span class="ruby-string">&#39;HTTP_ACCEPT_ENCODING&#39;</span>] <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-regexp">/\bgzip\b/</span>.<span class="ruby-identifier">match?</span>(<span class="ruby-identifier">env</span>[<span class="ruby-string">&#39;HTTP_ACCEPT_ENCODING&#39;</span>])
      <span class="ruby-identifier">path</span> = <span class="ruby-identifier">env</span>[<span class="ruby-constant">PATH_INFO</span>]
      <span class="ruby-identifier">env</span>[<span class="ruby-constant">PATH_INFO</span>] <span class="ruby-operator">+=</span> <span class="ruby-string">&#39;.gz&#39;</span>
      <span class="ruby-identifier">response</span> = <span class="ruby-ivar">@file_server</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
      <span class="ruby-identifier">env</span>[<span class="ruby-constant">PATH_INFO</span>] = <span class="ruby-identifier">path</span>

      <span class="ruby-keyword">if</span> <span class="ruby-identifier">response</span>[<span class="ruby-value">0</span>] <span class="ruby-operator">==</span> <span class="ruby-value">404</span>
        <span class="ruby-identifier">response</span> = <span class="ruby-keyword">nil</span>
      <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">response</span>[<span class="ruby-value">0</span>] <span class="ruby-operator">==</span> <span class="ruby-value">304</span>
        <span class="ruby-comment"># Do nothing, leave headers as is</span>
      <span class="ruby-keyword">else</span>
        <span class="ruby-keyword">if</span> <span class="ruby-identifier">mime_type</span> = <span class="ruby-constant">Mime</span>.<span class="ruby-identifier">mime_type</span>(<span class="ruby-operator">::</span><span class="ruby-constant">File</span>.<span class="ruby-identifier">extname</span>(<span class="ruby-identifier">path</span>), <span class="ruby-string">&#39;text/plain&#39;</span>)
          <span class="ruby-identifier">response</span>[<span class="ruby-value">1</span>][<span class="ruby-constant">CONTENT_TYPE</span>] = <span class="ruby-identifier">mime_type</span>
        <span class="ruby-keyword">end</span>
        <span class="ruby-identifier">response</span>[<span class="ruby-value">1</span>][<span class="ruby-string">&#39;Content-Encoding&#39;</span>] = <span class="ruby-string">&#39;gzip&#39;</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>

    <span class="ruby-identifier">path</span> = <span class="ruby-identifier">env</span>[<span class="ruby-constant">PATH_INFO</span>]
    <span class="ruby-identifier">response</span> <span class="ruby-operator">||=</span> <span class="ruby-ivar">@file_server</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)

    <span class="ruby-keyword">if</span> <span class="ruby-ivar">@cascade</span> <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-identifier">response</span>[<span class="ruby-value">0</span>] <span class="ruby-operator">==</span> <span class="ruby-value">404</span>
      <span class="ruby-keyword">return</span> <span class="ruby-ivar">@app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
    <span class="ruby-keyword">end</span>

    <span class="ruby-identifier">headers</span> = <span class="ruby-identifier">response</span>[<span class="ruby-value">1</span>]
    <span class="ruby-identifier">applicable_rules</span>(<span class="ruby-identifier">path</span>).<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">rule</span>, <span class="ruby-identifier">new_headers</span><span class="ruby-operator">|</span>
      <span class="ruby-identifier">new_headers</span>.<span class="ruby-identifier">each</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">field</span>, <span class="ruby-identifier">content</span><span class="ruby-operator">|</span> <span class="ruby-identifier">headers</span>[<span class="ruby-identifier">field</span>] = <span class="ruby-identifier">content</span> }
    <span class="ruby-keyword">end</span>

    <span class="ruby-identifier">response</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-ivar">@app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

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

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="can_serve-source">
            <pre><span class="ruby-comment"># File lib/rack/static.rb, line 119</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">can_serve</span>(<span class="ruby-identifier">path</span>)
  <span class="ruby-identifier">route_file</span>(<span class="ruby-identifier">path</span>) <span class="ruby-operator">||</span> <span class="ruby-identifier">overwrite_file_path</span>(<span class="ruby-identifier">path</span>)
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

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

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="overwrite_file_path-source">
            <pre><span class="ruby-comment"># File lib/rack/static.rb, line 111</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">overwrite_file_path</span>(<span class="ruby-identifier">path</span>)
  <span class="ruby-ivar">@urls</span>.<span class="ruby-identifier">kind_of?</span>(<span class="ruby-constant">Hash</span>) <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@urls</span>.<span class="ruby-identifier">key?</span>(<span class="ruby-identifier">path</span>) <span class="ruby-operator">||</span> <span class="ruby-identifier">add_index_root?</span>(<span class="ruby-identifier">path</span>)
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

        

        
      </div>

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

        <div class="method-description">
          
          
          
          

          
          <div class="method-source-code" id="route_file-source">
            <pre><span class="ruby-comment"># File lib/rack/static.rb, line 115</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">route_file</span>(<span class="ruby-identifier">path</span>)
  <span class="ruby-ivar">@urls</span>.<span class="ruby-identifier">kind_of?</span>(<span class="ruby-constant">Array</span>) <span class="ruby-operator">&amp;&amp;</span> <span class="ruby-ivar">@urls</span>.<span class="ruby-identifier">any?</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">url</span><span class="ruby-operator">|</span> <span class="ruby-identifier">path</span>.<span class="ruby-identifier">index</span>(<span class="ruby-identifier">url</span>) <span class="ruby-operator">==</span> <span class="ruby-value">0</span> }
<span class="ruby-keyword">end</span></pre>
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