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<h1 class="class">Rack::Deflater</h1>
<div id="description" class="description">
<p>This middleware enables compression of http responses.</p>
<p>Currently supported compression algorithms:</p>
<pre>* gzip
* deflate
* identity (no transformation)</pre>
<p>The middleware automatically detects when compression is supported and
allowed. For example no transformation is made when a cache directive of
'no-transform' is present, or when the response status code is one that
doesn't allow an entity body.</p>
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<p>Creates <a href="Deflater.html">Rack::Deflater</a> middleware.</p>
<dl class="rdoc-list"><dt>app</dt>
<dd>
<p>rack app instance</p>
</dd><dt>options</dt>
<dd>
<p>hash of deflater options, i.e. 'if' - a lambda enabling / disabling
deflation based on returned boolean value</p>
<pre>e.g use Rack::Deflater, :if => lambda { |env, status, headers, body| body.length > 512 }</pre>
<p>'include' - a list of content types that should be compressed</p>
</dd></dl>
<div class="method-source-code" id="new-source">
<pre>
<span class="ruby-comment"># File lib/rack/deflater.rb, line 27</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">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">@condition</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:if</span>]
<span class="ruby-ivar">@compressible_types</span> = <span class="ruby-identifier">options</span>[<span class="ruby-value">:include</span>]
<span class="ruby-keyword">end</span></pre>
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<pre>
<span class="ruby-comment"># File lib/rack/deflater.rb, line 34</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span> = <span class="ruby-ivar">@app</span>.<span class="ruby-identifier">call</span>(<span class="ruby-identifier">env</span>)
<span class="ruby-identifier">headers</span> = <span class="ruby-constant">Utils</span><span class="ruby-operator">::</span><span class="ruby-constant">HeaderHash</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">headers</span>)
<span class="ruby-keyword">unless</span> <span class="ruby-identifier">should_deflate?</span>(<span class="ruby-identifier">env</span>, <span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span>)
<span class="ruby-keyword">return</span> [<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span>]
<span class="ruby-keyword">end</span>
<span class="ruby-identifier">request</span> = <span class="ruby-constant">Request</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">env</span>)
<span class="ruby-identifier">encoding</span> = <span class="ruby-constant">Utils</span>.<span class="ruby-identifier">select_best_encoding</span>(<span class="ruby-node">%(gzip deflate identity)</span>,
<span class="ruby-identifier">request</span>.<span class="ruby-identifier">accept_encoding</span>)
<span class="ruby-comment"># Set the Vary HTTP header.</span>
<span class="ruby-identifier">vary</span> = <span class="ruby-identifier">headers</span>[<span class="ruby-string">"Vary"</span>].<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">split</span>(<span class="ruby-string">","</span>).<span class="ruby-identifier">map</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">v</span><span class="ruby-operator">|</span> <span class="ruby-identifier">v</span>.<span class="ruby-identifier">strip</span> }
<span class="ruby-keyword">unless</span> <span class="ruby-identifier">vary</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-string">"*"</span>) <span class="ruby-operator">||</span> <span class="ruby-identifier">vary</span>.<span class="ruby-identifier">include?</span>(<span class="ruby-string">"Accept-Encoding"</span>)
<span class="ruby-identifier">headers</span>[<span class="ruby-string">"Vary"</span>] = <span class="ruby-identifier">vary</span>.<span class="ruby-identifier">push</span>(<span class="ruby-string">"Accept-Encoding"</span>).<span class="ruby-identifier">join</span>(<span class="ruby-string">","</span>)
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">case</span> <span class="ruby-identifier">encoding</span>
<span class="ruby-keyword">when</span> <span class="ruby-string">"gzip"</span>
<span class="ruby-identifier">headers</span>[<span class="ruby-string">'Content-Encoding'</span>] = <span class="ruby-string">"gzip"</span>
<span class="ruby-identifier">headers</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-constant">CONTENT_LENGTH</span>)
<span class="ruby-identifier">mtime</span> = <span class="ruby-identifier">headers</span>.<span class="ruby-identifier">key?</span>(<span class="ruby-string">"Last-Modified"</span>) <span class="ruby-operator">?</span>
<span class="ruby-constant">Time</span>.<span class="ruby-identifier">httpdate</span>(<span class="ruby-identifier">headers</span>[<span class="ruby-string">"Last-Modified"</span>]) <span class="ruby-operator">:</span> <span class="ruby-constant">Time</span>.<span class="ruby-identifier">now</span>
[<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-constant">GzipStream</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">body</span>, <span class="ruby-identifier">mtime</span>)]
<span class="ruby-keyword">when</span> <span class="ruby-string">"deflate"</span>
<span class="ruby-identifier">headers</span>[<span class="ruby-string">'Content-Encoding'</span>] = <span class="ruby-string">"deflate"</span>
<span class="ruby-identifier">headers</span>.<span class="ruby-identifier">delete</span>(<span class="ruby-constant">CONTENT_LENGTH</span>)
[<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-constant">DeflateStream</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">body</span>)]
<span class="ruby-keyword">when</span> <span class="ruby-string">"identity"</span>
[<span class="ruby-identifier">status</span>, <span class="ruby-identifier">headers</span>, <span class="ruby-identifier">body</span>]
<span class="ruby-keyword">when</span> <span class="ruby-keyword">nil</span>
<span class="ruby-identifier">message</span> = <span class="ruby-node">"An acceptable encoding for the requested resource #{request.fullpath} could not be found."</span>
<span class="ruby-identifier">bp</span> = <span class="ruby-constant">Rack</span><span class="ruby-operator">::</span><span class="ruby-constant">BodyProxy</span>.<span class="ruby-identifier">new</span>([<span class="ruby-identifier">message</span>]) { <span class="ruby-identifier">body</span>.<span class="ruby-identifier">close</span> <span class="ruby-keyword">if</span> <span class="ruby-identifier">body</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:close</span>) }
[<span class="ruby-value">406</span>, {<span class="ruby-constant">CONTENT_TYPE</span> =<span class="ruby-operator">></span> <span class="ruby-string">"text/plain"</span>, <span class="ruby-constant">CONTENT_LENGTH</span> =<span class="ruby-operator">></span> <span class="ruby-identifier">message</span>.<span class="ruby-identifier">length</span>.<span class="ruby-identifier">to_s</span>}, <span class="ruby-identifier">bp</span>]
<span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
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