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<title>Network/Wai/Middleware/Autohead.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE OverloadedStrings #-}</span>
<a name="line-2"></a><span class='hs-comment'>-- | Automatically produce responses to HEAD requests based on the underlying</span>
<a name="line-3"></a><span class='hs-comment'>-- applications GET response.</span>
<a name="line-4"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Wai</span><span class='hs-varop'>.</span><span class='hs-conid'>Middleware</span><span class='hs-varop'>.</span><span class='hs-conid'>Autohead</span> <span class='hs-layout'>(</span><span class='hs-varid'>autohead</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>Wai</span>
<a name="line-7"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span> <span class='hs-layout'>(</span><span class='hs-varid'>mempty</span><span class='hs-layout'>)</span>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Enumerator</span> <span class='hs-layout'>(</span><span class='hs-varid'>enumEOF</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>$$</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-9"></a>
<a name="line-10"></a><a name="autohead"></a><span class='hs-definition'>autohead</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Middleware</span>
<a name="line-11"></a><span class='hs-definition'>autohead</span> <span class='hs-varid'>app</span> <span class='hs-varid'>req</span>
<a name="line-12"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>requestMethod</span> <span class='hs-varid'>req</span> <span class='hs-varop'>==</span> <span class='hs-str'>"HEAD"</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-13"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>app</span> <span class='hs-varid'>req</span> <span class='hs-layout'>{</span> <span class='hs-varid'>requestMethod</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"GET"</span> <span class='hs-layout'>}</span>
<a name="line-14"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>of</span>
<a name="line-15"></a> <span class='hs-conid'>ResponseFile</span> <span class='hs-varid'>s</span> <span class='hs-varid'>hs</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ResponseBuilder</span> <span class='hs-varid'>s</span> <span class='hs-varid'>hs</span> <span class='hs-varid'>mempty</span>
<a name="line-16"></a> <span class='hs-conid'>ResponseBuilder</span> <span class='hs-varid'>s</span> <span class='hs-varid'>hs</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ResponseBuilder</span> <span class='hs-varid'>s</span> <span class='hs-varid'>hs</span> <span class='hs-varid'>mempty</span>
<a name="line-17"></a> <span class='hs-conid'>ResponseEnumerator</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-18"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>helper</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span>
<a name="line-19"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>helper'</span> <span class='hs-varid'>s</span> <span class='hs-varid'>hs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>enumEOF</span> <span class='hs-varop'>$$</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-varid'>hs</span>
<a name="line-20"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>e</span> <span class='hs-varid'>helper'</span>
<a name="line-21"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ResponseEnumerator</span> <span class='hs-varid'>helper</span>
<a name="line-22"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>app</span> <span class='hs-varid'>req</span>
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