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DataResponse Structure Reference
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<article class="main-content">
<section class="section">
<div class="section-content">
<h1>DataResponse</h1>
<div class="declaration">
<div class="language">
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">struct</span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Value</span><span class="o">></span></code></pre>
</div>
</div>
<p>Used to store all data associated with a serialized response of a data or upload request.</p>
</div>
</section>
<section class="section">
<div class="section-content">
<div class="task-group">
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV7request10Foundation10URLRequestVSgvp"></a>
<a name="//apple_ref/swift/Property/request" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV7request10Foundation10URLRequestVSgvp">request</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The URL request sent to the server.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">request</span><span class="p">:</span> <span class="kt">URLRequest</span><span class="p">?</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV8responseSo15HTTPURLResponseCSgvp"></a>
<a name="//apple_ref/swift/Property/response" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV8responseSo15HTTPURLResponseCSgvp">response</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The server’s response to the URL request.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">response</span><span class="p">:</span> <span class="kt">HTTPURLResponse</span><span class="p">?</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV4data10Foundation0B0VSgvp"></a>
<a name="//apple_ref/swift/Property/data" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV4data10Foundation0B0VSgvp">data</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The data returned by the server.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">data</span><span class="p">:</span> <span class="kt">Data</span><span class="p">?</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV6resultAA6ResultOyxGvp"></a>
<a name="//apple_ref/swift/Property/result" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV6resultAA6ResultOyxGvp">result</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The result of response serialization.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">result</span><span class="p">:</span> <span class="kt"><a href="../Enums/Result.html">Result</a></span><span class="o"><</span><span class="kt">Value</span><span class="o">></span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV8timelineAA8TimelineVvp"></a>
<a name="//apple_ref/swift/Property/timeline" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV8timelineAA8TimelineVvp">timeline</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The timeline of the complete lifecycle of the request.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">let</span> <span class="nv">timeline</span><span class="p">:</span> <span class="kt"><a href="../Structs/Timeline.html">Timeline</a></span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV5valuexSgvp"></a>
<a name="//apple_ref/swift/Property/value" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV5valuexSgvp">value</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Returns the associated value of the result if it is a success, <code>nil</code> otherwise.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">value</span><span class="p">:</span> <span class="kt">Value</span><span class="p">?</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV5errors5Error_pSgvp"></a>
<a name="//apple_ref/swift/Property/error" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV5errors5Error_pSgvp">error</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Returns the associated error value if the result if it is a failure, <code>nil</code> otherwise.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">error</span><span class="p">:</span> <span class="kt">Error</span><span class="p">?</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseVACyxG10Foundation10URLRequestVSg7request_So15HTTPURLResponseCSg8responseAE0B0VSg4dataAA6ResultOyxG6resultAA8TimelineV8timelinetcfc"></a>
<a name="//apple_ref/swift/Method/init(request:response:data:result:timeline:)" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseVACyxG10Foundation10URLRequestVSg7request_So15HTTPURLResponseCSg8responseAE0B0VSg4dataAA6ResultOyxG6resultAA8TimelineV8timelinetcfc">init(request:response:data:result:timeline:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Creates a <code>DataResponse</code> instance with the specified parameters derived from response serialization.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="nf">init</span><span class="p">(</span>
<span class="nv">request</span><span class="p">:</span> <span class="kt">URLRequest</span><span class="p">?,</span>
<span class="nv">response</span><span class="p">:</span> <span class="kt">HTTPURLResponse</span><span class="p">?,</span>
<span class="nv">data</span><span class="p">:</span> <span class="kt">Data</span><span class="p">?,</span>
<span class="nv">result</span><span class="p">:</span> <span class="kt"><a href="../Enums/Result.html">Result</a></span><span class="o"><</span><span class="kt">Value</span><span class="o">></span><span class="p">,</span>
<span class="nv">timeline</span><span class="p">:</span> <span class="kt"><a href="../Structs/Timeline.html">Timeline</a></span> <span class="o">=</span> <span class="kt"><a href="../Structs/Timeline.html">Timeline</a></span><span class="p">())</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>request</em>
</code>
</td>
<td>
<div>
<p>The URL request sent to the server.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>response</em>
</code>
</td>
<td>
<div>
<p>The server’s response to the URL request.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>data</em>
</code>
</td>
<td>
<div>
<p>The data returned by the server.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>result</em>
</code>
</td>
<td>
<div>
<p>The result of response serialization.</p>
</div>
</td>
</tr>
<tr>
<td>
<code>
<em>timeline</em>
</code>
</td>
<td>
<div>
<p>The timeline of the complete lifecycle of the <code><a href="../Classes/Request.html">Request</a></code>. Defaults to <code>Timeline()</code>.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>The new <code>DataResponse</code> instance.</p>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV11descriptionSSvp"></a>
<a name="//apple_ref/swift/Property/description" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV11descriptionSSvp">description</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The textual representation used when written to an output stream, which includes whether the result was a
success or failure.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">description</span><span class="p">:</span> <span class="kt">String</span></code></pre>
</div>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV16debugDescriptionSSvp"></a>
<a name="//apple_ref/swift/Property/debugDescription" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV16debugDescriptionSSvp">debugDescription</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The debug textual representation used when written to an output stream, which includes the URL request, the URL
response, the server data, the response serialization result and the timeline.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">debugDescription</span><span class="p">:</span> <span class="kt">String</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV3mapACyqd__Gqd__xclF"></a>
<a name="//apple_ref/swift/Method/map(_:)" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV3mapACyqd__Gqd__xclF">map(_:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Evaluates the specified closure when the result of this <code>DataResponse</code> is a success, passing the unwrapped
result value as a parameter.</p>
<p>Use the <code>map</code> method with a closure that does not throw. For example:</p>
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">possibleData</span><span class="p">:</span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Data</span><span class="o">></span> <span class="o">=</span> <span class="o">...</span>
<span class="k">let</span> <span class="nv">possibleInt</span> <span class="o">=</span> <span class="n">possibleData</span><span class="o">.</span><span class="n">map</span> <span class="p">{</span> <span class="nv">$0</span><span class="o">.</span><span class="n">count</span> <span class="p">}</span>
</code></pre>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="n">map</span><span class="o"><</span><span class="kt">T</span><span class="o">></span><span class="p">(</span><span class="n">_</span> <span class="nv">transform</span><span class="p">:</span> <span class="p">(</span><span class="kt">Value</span><span class="p">)</span> <span class="o">-></span> <span class="kt">T</span><span class="p">)</span> <span class="o">-></span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">T</span><span class="o">></span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>transform</em>
</code>
</td>
<td>
<div>
<p>A closure that takes the success value of the instance’s result.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>A <code>DataResponse</code> whose result wraps the value returned by the given closure. If this instance’s
result is a failure, returns a response wrapping the same failure.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV7flatMapACyqd__Gqd__xKclF"></a>
<a name="//apple_ref/swift/Method/flatMap(_:)" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV7flatMapACyqd__Gqd__xKclF">flatMap(_:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Evaluates the given closure when the result of this <code>DataResponse</code> is a success, passing the unwrapped result
value as a parameter.</p>
<p>Use the <code>flatMap</code> method with a closure that may throw an error. For example:</p>
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">possibleData</span><span class="p">:</span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Data</span><span class="o">></span> <span class="o">=</span> <span class="o">...</span>
<span class="k">let</span> <span class="nv">possibleObject</span> <span class="o">=</span> <span class="n">possibleData</span><span class="o">.</span><span class="n">flatMap</span> <span class="p">{</span>
<span class="k">try</span> <span class="kt">JSONSerialization</span><span class="o">.</span><span class="nf">jsonObject</span><span class="p">(</span><span class="nv">with</span><span class="p">:</span> <span class="nv">$0</span><span class="p">)</span>
<span class="p">}</span>
</code></pre>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="n">flatMap</span><span class="o"><</span><span class="kt">T</span><span class="o">></span><span class="p">(</span><span class="n">_</span> <span class="nv">transform</span><span class="p">:</span> <span class="p">(</span><span class="kt">Value</span><span class="p">)</span> <span class="k">throws</span> <span class="o">-></span> <span class="kt">T</span><span class="p">)</span> <span class="o">-></span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">T</span><span class="o">></span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>transform</em>
</code>
</td>
<td>
<div>
<p>A closure that takes the success value of the instance’s result.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>A success or failure <code>DataResponse</code> depending on the result of the given closure. If this instance’s
result is a failure, returns the same failure.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV8mapErrorACyxGqd__s0E0_pcsAFRd__lF"></a>
<a name="//apple_ref/swift/Method/mapError(_:)" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV8mapErrorACyxGqd__s0E0_pcsAFRd__lF">mapError(_:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Evaluates the specified closure when the <code>DataResponse</code> is a failure, passing the unwrapped error as a parameter.</p>
<p>Use the <code>mapError</code> function with a closure that does not throw. For example:</p>
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">possibleData</span><span class="p">:</span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Data</span><span class="o">></span> <span class="o">=</span> <span class="o">...</span>
<span class="k">let</span> <span class="nv">withMyError</span> <span class="o">=</span> <span class="n">possibleData</span><span class="o">.</span><span class="n">mapError</span> <span class="p">{</span> <span class="kt">MyError</span><span class="o">.</span><span class="nf">error</span><span class="p">(</span><span class="nv">$0</span><span class="p">)</span> <span class="p">}</span>
</code></pre>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="n">mapError</span><span class="o"><</span><span class="kt">E</span><span class="p">:</span> <span class="kt">Error</span><span class="o">></span><span class="p">(</span><span class="n">_</span> <span class="nv">transform</span><span class="p">:</span> <span class="p">(</span><span class="kt">Error</span><span class="p">)</span> <span class="o">-></span> <span class="kt">E</span><span class="p">)</span> <span class="o">-></span> <span class="kt">DataResponse</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>transform</em>
</code>
</td>
<td>
<div>
<p>A closure that takes the error of the instance.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>A <code>DataResponse</code> instance containing the result of the transform.</p>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV12flatMapErrorACyxGqd__s0F0_pKcsAFRd__lF"></a>
<a name="//apple_ref/swift/Method/flatMapError(_:)" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV12flatMapErrorACyxGqd__s0F0_pKcsAFRd__lF">flatMapError(_:)</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Evaluates the specified closure when the <code>DataResponse</code> is a failure, passing the unwrapped error as a parameter.</p>
<p>Use the <code>flatMapError</code> function with a closure that may throw an error. For example:</p>
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">possibleData</span><span class="p">:</span> <span class="kt">DataResponse</span><span class="o"><</span><span class="kt">Data</span><span class="o">></span> <span class="o">=</span> <span class="o">...</span>
<span class="k">let</span> <span class="nv">possibleObject</span> <span class="o">=</span> <span class="n">possibleData</span><span class="o">.</span><span class="n">flatMapError</span> <span class="p">{</span>
<span class="k">try</span> <span class="nf">someFailableFunction</span><span class="p">(</span><span class="nv">taking</span><span class="p">:</span> <span class="nv">$0</span><span class="p">)</span>
<span class="p">}</span>
</code></pre>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">func</span> <span class="n">flatMapError</span><span class="o"><</span><span class="kt">E</span><span class="p">:</span> <span class="kt">Error</span><span class="o">></span><span class="p">(</span><span class="n">_</span> <span class="nv">transform</span><span class="p">:</span> <span class="p">(</span><span class="kt">Error</span><span class="p">)</span> <span class="k">throws</span> <span class="o">-></span> <span class="kt">E</span><span class="p">)</span> <span class="o">-></span> <span class="kt">DataResponse</span></code></pre>
</div>
</div>
<div>
<h4>Parameters</h4>
<table class="graybox">
<tbody>
<tr>
<td>
<code>
<em>transform</em>
</code>
</td>
<td>
<div>
<p>A throwing closure that takes the error of the instance.</p>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<div>
<h4>Return Value</h4>
<p>A <code>DataResponse</code> instance containing the result of the transform.</p>
</div>
</section>
</div>
</li>
</ul>
</div>
<div class="task-group">
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:9Alamofire12DataResponseV7metricsSo21URLSessionTaskMetricsCSgvp"></a>
<a name="//apple_ref/swift/Property/metrics" class="dashAnchor"></a>
<a class="token" href="#/s:9Alamofire12DataResponseV7metricsSo21URLSessionTaskMetricsCSgvp">metrics</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>The task metrics containing the request / response statistics.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="k">var</span> <span class="nv">metrics</span><span class="p">:</span> <span class="kt">URLSessionTaskMetrics</span><span class="p">?</span></code></pre>
</div>
</div>
</section>
</div>
</li>
</ul>
</div>
</div>
</section>
</article>
</div>
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