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<title>class Rack::ShowExceptions - rack-2.2.10 Documentation</title>

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

<section class="description">
    
<p><a href="ShowExceptions.html"><code>Rack::ShowExceptions</code></a> catches all exceptions raised from the app it wraps.  It shows a useful backtrace with the sourcefile and clickable context, the whole <a href="../Rack.html"><code>Rack</code></a> environment and the request data.</p>

<p>Be careful when you use this on public-facing sites as it could reveal information helpful to attackers.</p>

</section>

<section class="constants-list">
      <header>
        <h3>Constants</h3>
      </header>
      <dl>
      
        <dt id="CONTEXT">CONTEXT
        
        <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-new" class="method-detail ">
        
        <div class="method-heading">
          <span class="method-name">new</span><span
            class="method-args">(app)</span>
          
          <span class="method-click-advice">click to toggle source</span>
          
        </div>

<div class="method-source-code" id="new-source">
            <pre><span class="ruby-comment"># File lib/rack/show_exceptions.rb, line 18</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">initialize</span>(<span class="ruby-identifier">app</span>)
  <span class="ruby-ivar">@app</span> = <span class="ruby-identifier">app</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-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>
          
        </div>

<div class="method-source-code" id="call-source">
            <pre><span class="ruby-comment"># File lib/rack/show_exceptions.rb, line 22</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">call</span>(<span class="ruby-identifier">env</span>)
  <span class="ruby-ivar">@app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
<span class="ruby-keyword">rescue</span> <span class="ruby-constant">StandardError</span>, <span class="ruby-constant">LoadError</span>, <span class="ruby-constant">SyntaxError</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">e</span>
  <span class="ruby-identifier">exception_string</span> = <span class="ruby-identifier">dump_exception</span>(<span class="ruby-identifier">e</span>)

<span class="ruby-identifier">env</span>[<span class="ruby-constant">RACK_ERRORS</span>].<span class="ruby-identifier">puts</span>(<span class="ruby-identifier">exception_string</span>)
  <span class="ruby-identifier">env</span>[<span class="ruby-constant">RACK_ERRORS</span>].<span class="ruby-identifier">flush</span>

<span class="ruby-keyword">if</span> <span class="ruby-identifier">accepts_html?</span>(<span class="ruby-identifier">env</span>)
    <span class="ruby-identifier">content_type</span> = <span class="ruby-string">&quot;text/html&quot;</span>
    <span class="ruby-identifier">body</span> = <span class="ruby-identifier">pretty</span>(<span class="ruby-identifier">env</span>, <span class="ruby-identifier">e</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">content_type</span> = <span class="ruby-string">&quot;text/plain&quot;</span>
    <span class="ruby-identifier">body</span> = <span class="ruby-identifier">exception_string</span>
  <span class="ruby-keyword">end</span>

[
    <span class="ruby-value">500</span>,
    {
      <span class="ruby-constant">CONTENT_TYPE</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">content_type</span>,
      <span class="ruby-constant">CONTENT_LENGTH</span> <span class="ruby-operator">=&gt;</span> <span class="ruby-identifier">body</span>.<span class="ruby-identifier">bytesize</span>.<span class="ruby-identifier">to_s</span>,
    },
    [<span class="ruby-identifier">body</span>],
  ]
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

</div>

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

<div class="method-source-code" id="dump_exception-source">
            <pre><span class="ruby-comment"># File lib/rack/show_exceptions.rb, line 57</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">dump_exception</span>(<span class="ruby-identifier">exception</span>)
  <span class="ruby-identifier">string</span> = <span class="ruby-node">&quot;#{exception.class}: #{exception.message}\n&quot;</span>.<span class="ruby-identifier">dup</span>
  <span class="ruby-identifier">string</span> <span class="ruby-operator">&lt;&lt;</span> <span class="ruby-identifier">exception</span>.<span class="ruby-identifier">backtrace</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">l</span><span class="ruby-operator">|</span> <span class="ruby-node">&quot;\t#{l}&quot;</span> }.<span class="ruby-identifier">join</span>(<span class="ruby-string">&quot;\n&quot;</span>)
  <span class="ruby-identifier">string</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

</div>

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

<div class="method-source-code" id="prefers_plaintext-3F-source">
            <pre><span class="ruby-comment"># File lib/rack/show_exceptions.rb, line 48</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">prefers_plaintext?</span>(<span class="ruby-identifier">env</span>)
  <span class="ruby-operator">!</span><span class="ruby-identifier">accepts_html?</span>(<span class="ruby-identifier">env</span>)
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

</div>

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

<div class="method-source-code" id="pretty-source">
            <pre><span class="ruby-comment"># File lib/rack/show_exceptions.rb, line 63</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">pretty</span>(<span class="ruby-identifier">env</span>, <span class="ruby-identifier">exception</span>)
  <span class="ruby-identifier">req</span> = <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Request</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">env</span>)

<span class="ruby-comment"># This double assignment is to prevent an &quot;unused variable&quot; warning.</span>
  <span class="ruby-comment"># Yes, it is dumb, but I don&#39;t like Ruby yelling at me.</span>
  <span class="ruby-identifier">frames</span> = <span class="ruby-identifier">frames</span> = <span class="ruby-identifier">exception</span>.<span class="ruby-identifier">backtrace</span>.<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">line</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">frame</span> = <span class="ruby-constant">OpenStruct</span>.<span class="ruby-identifier">new</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">line</span> <span class="ruby-operator">=~</span> <span class="ruby-regexp">/(.*?):(\d+)(:in `(.*)&#39;)?/</span>
      <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">filename</span> = <span class="ruby-node">$1</span>
      <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">lineno</span> = <span class="ruby-node">$2</span>.<span class="ruby-identifier">to_i</span>
      <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">function</span> = <span class="ruby-node">$4</span>

<span class="ruby-keyword">begin</span>
        <span class="ruby-identifier">lineno</span> = <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">lineno</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>
        <span class="ruby-identifier">lines</span> = <span class="ruby-operator">::</span><span class="ruby-constant">File</span>.<span class="ruby-identifier">readlines</span>(<span class="ruby-identifier">frame</span>.<span class="ruby-identifier">filename</span>)
        <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">pre_context_lineno</span> = [<span class="ruby-identifier">lineno</span> <span class="ruby-operator">-</span> <span class="ruby-constant">CONTEXT</span>, <span class="ruby-value">0</span>].<span class="ruby-identifier">max</span>
        <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">pre_context</span> = <span class="ruby-identifier">lines</span>[<span class="ruby-identifier">frame</span>.<span class="ruby-identifier">pre_context_lineno</span><span class="ruby-operator">...</span><span class="ruby-identifier">lineno</span>]
        <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">context_line</span> = <span class="ruby-identifier">lines</span>[<span class="ruby-identifier">lineno</span>].<span class="ruby-identifier">chomp</span>
        <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">post_context_lineno</span> = [<span class="ruby-identifier">lineno</span> <span class="ruby-operator">+</span> <span class="ruby-constant">CONTEXT</span>, <span class="ruby-identifier">lines</span>.<span class="ruby-identifier">size</span>].<span class="ruby-identifier">min</span>
        <span class="ruby-identifier">frame</span>.<span class="ruby-identifier">post_context</span> = <span class="ruby-identifier">lines</span>[<span class="ruby-identifier">lineno</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span><span class="ruby-operator">..</span><span class="ruby-identifier">frame</span>.<span class="ruby-identifier">post_context_lineno</span>]
      <span class="ruby-keyword">rescue</span>
      <span class="ruby-keyword">end</span>

<span class="ruby-identifier">frame</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-keyword">nil</span>
    <span class="ruby-keyword">end</span>
  }.<span class="ruby-identifier">compact</span>

<span class="ruby-identifier">template</span>.<span class="ruby-identifier">result</span>(<span class="ruby-identifier">binding</span>)
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

</div>

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

<div class="method-source-code" id="template-source">
            <pre><span class="ruby-comment"># File lib/rack/show_exceptions.rb, line 99</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">template</span>
  <span class="ruby-constant">TEMPLATE</span>
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

</div>

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

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

<div class="method-source-code" id="accepts_html-3F-source">
            <pre><span class="ruby-comment"># File lib/rack/show_exceptions.rb, line 52</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">accepts_html?</span>(<span class="ruby-identifier">env</span>)
  <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">Utils</span>.<span class="ruby-identifier">best_q_match</span>(<span class="ruby-identifier">env</span>[<span class="ruby-string">&quot;HTTP_ACCEPT&quot;</span>], <span class="ruby-node">%w[text/html]</span>)
<span class="ruby-keyword">end</span></pre>
          </div>
          
        </div>

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