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<section id="cross-origin-resource-sharing-cors">
<h1>Cross-Origin Resource Sharing (CORS)<a class="headerlink" href="#cross-origin-resource-sharing-cors" title="Permalink to this heading"></a></h1>
<div class="versionadded">
<p><span class="versionmodified added">New in version 4.5.0.</span></p>
</div>
<p>Cross-Origin Resource Sharing (CORS) is an HTTP-header based security mechanism
that allows a server to indicate any origins (domain, scheme, or port) other than
its own from which a browser should permit loading resources.</p>
<p>CORS works by adding headers to HTTP requests and responses to indicate whether
the requested resource can be shared across different origins, helping to prevent
malicious attacks like cross-site request forgery (CSRF) and data theft.</p>
<p>If you are not familiar with CORS and CORS headers, please read the
<a class="reference external" href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#the_http_response_headers">MDN documentation on CORS</a>.</p>
<p>CodeIgniter provides the CORS filter and helper class.</p>
<nav class="contents local" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#configuring-cors" id="id1">Configuring CORS</a></p>
<ul>
<li><p><a class="reference internal" href="#setting-default-config" id="id2">Setting Default Config</a></p></li>
<li><p><a class="reference internal" href="#enabling-cors" id="id3">Enabling CORS</a></p></li>
<li><p><a class="reference internal" href="#checking-routes-and-filters" id="id4">Checking Routes and Filters</a></p></li>
<li><p><a class="reference internal" href="#setting-another-config" id="id5">Setting Another Config</a></p></li>
</ul>
</li>
<li><p><a class="reference internal" href="#namespace-CodeIgniter\HTTP" id="id6">Class Reference</a></p></li>
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<section id="configuring-cors">
<h2><a class="toc-backref" href="#id1" role="doc-backlink">Configuring CORS</a><a class="headerlink" href="#configuring-cors" title="Permalink to this heading"></a></h2>
<section id="setting-default-config">
<h3><a class="toc-backref" href="#id2" role="doc-backlink">Setting Default Config</a><a class="headerlink" href="#setting-default-config" title="Permalink to this heading"></a></h3>
<p>CORS can be configured by <strong>app/Config/Cors.php</strong>.</p>
<p>At a minimum, the following items in the <code class="docutils literal notranslate"><span class="pre">$default</span></code> property must be set:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">allowedOrigins</span></code>: List explicitly the Origin(s) you want to allow.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">allowedHeaders</span></code>: List explicitly the HTTP headers you want to allow.</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">allowedMethods</span></code>: List explicitly the HTTP methods you want to allow.</p></li>
</ul>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>Based on the principle of least privilege, only the minimum necessary
Origin, Methods, and Headers should be allowed.</p>
</div>
<p>If you send credentials (e.g., cookies) with a cross-origin request, set
<code class="docutils literal notranslate"><span class="pre">supportsCredentials</span></code> to <code class="docutils literal notranslate"><span class="pre">true</span></code>.</p>
</section>
<section id="enabling-cors">
<h3><a class="toc-backref" href="#id3" role="doc-backlink">Enabling CORS</a><a class="headerlink" href="#enabling-cors" title="Permalink to this heading"></a></h3>
<p>To enable CORS, you need to do two things:</p>
<ol class="arabic simple">
<li><p>Specify the <code class="docutils literal notranslate"><span class="pre">cors</span></code> filter to routes that you permit CORS.</p></li>
<li><p>Add <strong>OPTIONS</strong> routes for CORS Preflight Requests.</p></li>
</ol>
<section id="set-against-routes">
<h4>Set against Routes<a class="headerlink" href="#set-against-routes" title="Permalink to this heading"></a></h4>
<p>You can set the <code class="docutils literal notranslate"><span class="pre">cors</span></code> filter to routes with <strong>app/Config/Routes.php</strong>.</p>
<p>E.g.,</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
<span class="k">use</span> <span class="nx">CodeIgniter\Router\RouteCollection</span><span class="p">;</span>
<span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">group</span><span class="p">(</span><span class="s1">&#39;&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s1">&#39;filter&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;cors&#39;</span><span class="p">],</span> <span class="k">static</span> <span class="k">function</span> <span class="p">(</span><span class="nx">RouteCollection</span> <span class="nv">$routes</span><span class="p">)</span><span class="o">:</span> <span class="nx">void</span> <span class="p">{</span>
<span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">resource</span><span class="p">(</span><span class="s1">&#39;product&#39;</span><span class="p">);</span>
<span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">options</span><span class="p">(</span><span class="s1">&#39;product&#39;</span><span class="p">,</span> <span class="k">static</span> <span class="k">function</span> <span class="p">()</span> <span class="p">{</span>
<span class="c1">// Implement processing for normal non-preflight OPTIONS requests,</span>
<span class="c1">// if necessary.</span>
<span class="nv">$response</span> <span class="o">=</span> <span class="nx">response</span><span class="p">();</span>
<span class="nv">$response</span><span class="o">-&gt;</span><span class="na">setStatusCode</span><span class="p">(</span><span class="mi">204</span><span class="p">);</span>
<span class="nv">$response</span><span class="o">-&gt;</span><span class="na">setHeader</span><span class="p">(</span><span class="s1">&#39;Allow:&#39;</span><span class="p">,</span> <span class="s1">&#39;OPTIONS, GET, POST, PUT, PATCH, DELETE&#39;</span><span class="p">);</span>
<span class="k">return</span> <span class="nv">$response</span><span class="p">;</span>
<span class="p">});</span>
<span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">options</span><span class="p">(</span><span class="s1">&#39;product/(:any)&#39;</span><span class="p">,</span> <span class="k">static</span> <span class="k">function</span> <span class="p">()</span> <span class="p">{});</span>
<span class="p">});</span>
</pre></div>
</div>
<p>Dont forget to add OPTIONS routes for Preflight Requests. Because Controller
Filters (except for Required Filters) do not work if the route does not exist.</p>
<p>The CORS filter handles all Preflight Requests, so the closure controllers
for the OPTIONS routes are not normally called.</p>
</section>
<section id="set-in-config-filters">
<h4>Set in Config\Filters<a class="headerlink" href="#set-in-config-filters" title="Permalink to this heading"></a></h4>
<p>Alternatively, you can set the <code class="docutils literal notranslate"><span class="pre">cors</span></code> filter to URI paths in <strong>app/Config/Filters.php</strong>.</p>
<p>E.g.,</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
<span class="k">namespace</span> <span class="nx">Config</span><span class="p">;</span>
<span class="k">use</span> <span class="nx">CodeIgniter\Config\Filters</span> <span class="k">as</span> <span class="nx">BaseFilters</span><span class="p">;</span>
<span class="c1">// ...</span>
<span class="k">class</span> <span class="nc">Filters</span> <span class="k">extends</span> <span class="nx">BaseFilters</span>
<span class="p">{</span>
<span class="c1">// ...</span>
<span class="k">public</span> <span class="k">array</span> <span class="nv">$filters</span> <span class="o">=</span> <span class="p">[</span>
<span class="c1">// ...</span>
<span class="s1">&#39;cors&#39;</span> <span class="o">=&gt;</span> <span class="p">[</span>
<span class="s1">&#39;before&#39;</span> <span class="o">=&gt;</span> <span class="p">[</span><span class="s1">&#39;api/*&#39;</span><span class="p">],</span>
<span class="s1">&#39;after&#39;</span> <span class="o">=&gt;</span> <span class="p">[</span><span class="s1">&#39;api/*&#39;</span><span class="p">],</span>
<span class="p">],</span>
<span class="p">];</span>
<span class="p">}</span>
</pre></div>
</div>
<p>Dont forget to add OPTIONS routes for Preflight Requests. Because Controller
Filters (except for Required Filters) do not work if the route does not exist.</p>
<p>E.g.,</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
<span class="k">use</span> <span class="nx">CodeIgniter\Router\RouteCollection</span><span class="p">;</span>
<span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">group</span><span class="p">(</span><span class="s1">&#39;&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s1">&#39;filter&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;cors&#39;</span><span class="p">],</span> <span class="k">static</span> <span class="k">function</span> <span class="p">(</span><span class="nx">RouteCollection</span> <span class="nv">$routes</span><span class="p">)</span><span class="o">:</span> <span class="nx">void</span> <span class="p">{</span>
<span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">options</span><span class="p">(</span><span class="s1">&#39;api/(:any)&#39;</span><span class="p">,</span> <span class="k">static</span> <span class="k">function</span> <span class="p">()</span> <span class="p">{});</span>
<span class="p">});</span>
</pre></div>
</div>
<p>The CORS filter handles all Preflight Requests, so the closure controller
for the OPTIONS routes is not normally called.</p>
</section>
</section>
<section id="checking-routes-and-filters">
<h3><a class="toc-backref" href="#id4" role="doc-backlink">Checking Routes and Filters</a><a class="headerlink" href="#checking-routes-and-filters" title="Permalink to this heading"></a></h3>
<p>After configuration, you can check the routes and filters with the <a class="reference internal" href="../incoming/routing.html#routing-spark-routes"><span class="std std-ref">spark routes</span></a>
command.</p>
</section>
<section id="setting-another-config">
<h3><a class="toc-backref" href="#id5" role="doc-backlink">Setting Another Config</a><a class="headerlink" href="#setting-another-config" title="Permalink to this heading"></a></h3>
<p>If you want to use a different configuration than the default configuration, add
a property to <strong>app/Config/Cors.php</strong>.</p>
<p>For example, add the <code class="docutils literal notranslate"><span class="pre">$api</span></code> property.</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
<span class="k">namespace</span> <span class="nx">Config</span><span class="p">;</span>
<span class="k">use</span> <span class="nx">CodeIgniter\Config\BaseConfig</span><span class="p">;</span>
<span class="sd">/**</span>
<span class="sd"> * Cross-Origin Resource Sharing (CORS) Configuration</span>
<span class="sd"> *</span>
<span class="sd"> * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS</span>
<span class="sd"> */</span>
<span class="k">class</span> <span class="nc">Cors</span> <span class="k">extends</span> <span class="nx">BaseConfig</span>
<span class="p">{</span>
<span class="c1">// ...</span>
<span class="k">public</span> <span class="k">array</span> <span class="nv">$api</span> <span class="o">=</span> <span class="p">[</span>
<span class="s1">&#39;allowedOrigins&#39;</span> <span class="o">=&gt;</span> <span class="p">[</span><span class="s1">&#39;https://app.example.com&#39;</span><span class="p">],</span>
<span class="s1">&#39;allowedOriginsPatterns&#39;</span> <span class="o">=&gt;</span> <span class="p">[],</span>
<span class="s1">&#39;supportsCredentials&#39;</span> <span class="o">=&gt;</span> <span class="k">true</span><span class="p">,</span>
<span class="s1">&#39;allowedHeaders&#39;</span> <span class="o">=&gt;</span> <span class="p">[</span><span class="s1">&#39;Authorization&#39;</span><span class="p">,</span> <span class="s1">&#39;Content-Type&#39;</span><span class="p">],</span>
<span class="s1">&#39;exposedHeaders&#39;</span> <span class="o">=&gt;</span> <span class="p">[],</span>
<span class="s1">&#39;allowedMethods&#39;</span> <span class="o">=&gt;</span> <span class="p">[</span><span class="s1">&#39;GET&#39;</span><span class="p">,</span> <span class="s1">&#39;POST&#39;</span><span class="p">,</span> <span class="s1">&#39;PUT&#39;</span><span class="p">,</span> <span class="s1">&#39;DELETE&#39;</span><span class="p">],</span>
<span class="s1">&#39;maxAge&#39;</span> <span class="o">=&gt;</span> <span class="mi">7200</span><span class="p">,</span>
<span class="p">];</span>
<span class="p">}</span>
</pre></div>
</div>
<p>The property name (<code class="docutils literal notranslate"><span class="pre">api</span></code> in the above example) will become the configuration name.</p>
<p>Then, specify the property name as the filter argument like <code class="docutils literal notranslate"><span class="pre">cors:api</span></code>:</p>
<div class="highlight-html+php notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
<span class="k">use</span> <span class="nx">CodeIgniter\Router\RouteCollection</span><span class="p">;</span>
<span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">group</span><span class="p">(</span><span class="s1">&#39;api&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s1">&#39;filter&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;cors:api&#39;</span><span class="p">],</span> <span class="k">static</span> <span class="k">function</span> <span class="p">(</span><span class="nx">RouteCollection</span> <span class="nv">$routes</span><span class="p">)</span><span class="o">:</span> <span class="nx">void</span> <span class="p">{</span>
<span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">resource</span><span class="p">(</span><span class="s1">&#39;user&#39;</span><span class="p">);</span>
<span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">options</span><span class="p">(</span><span class="s1">&#39;user&#39;</span><span class="p">,</span> <span class="k">static</span> <span class="k">function</span> <span class="p">()</span> <span class="p">{});</span>
<span class="nv">$routes</span><span class="o">-&gt;</span><span class="na">options</span><span class="p">(</span><span class="s1">&#39;user/(:any)&#39;</span><span class="p">,</span> <span class="k">static</span> <span class="k">function</span> <span class="p">()</span> <span class="p">{});</span>
<span class="p">});</span>
</pre></div>
</div>
<p>You can also use <a class="reference internal" href="../incoming/filters.html#filters-filters-filter-arguments"><span class="std std-ref">Filter Arguments</span></a>.</p>
</section>
</section>
<section id="namespace-CodeIgniter\HTTP">
<span id="class-reference"></span><h2><a class="toc-backref" href="#id6" role="doc-backlink">Class Reference</a><a class="headerlink" href="#namespace-CodeIgniter\HTTP" title="Permalink to this heading"></a></h2>
<dl class="php class">
<dt class="sig sig-object php" id="CodeIgniter\HTTP\Cors">
<em class="property"><span class="pre">class</span> </em><span class="sig-prename descclassname"><span class="pre">CodeIgniter\HTTP\</span></span><span class="sig-name descname"><span class="pre">Cors</span></span><a class="headerlink" href="#CodeIgniter\HTTP\Cors" title="Permalink to this definition"></a></dt>
<dd></dd></dl>
<dl class="php method">
<dt class="sig sig-object php" id="CodeIgniter\HTTP\Cors::addResponseHeaders">
<span class="sig-prename descclassname"><span class="pre">CodeIgniter\HTTP\Cors::</span></span><span class="sig-name descname"><span class="pre">addResponseHeaders</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="pre">RequestInterface</span> <span class="pre">$request</span></em>, <em class="sig-param"><span class="pre">ResponseInterface</span> <span class="pre">$response</span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">&#x2192;</span> <span class="sig-return-typehint"><span class="pre">ResponseInterface</span></span></span><a class="headerlink" href="#CodeIgniter\HTTP\Cors::addResponseHeaders" title="Permalink to this definition"></a></dt>
<dd><dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>$request</strong> (<span><code class="xref php php-obj docutils literal notranslate"><span class="pre">RequestInterface</span></code></span>) Request instance</p></li>
<li><p><strong>$response</strong> (<span><code class="xref php php-obj docutils literal notranslate"><span class="pre">ResponseInterface</span></code></span>) Response instance</p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p>Response instance</p>
</dd>
<dt class="field-odd">Return type<span class="colon">:</span></dt>
<dd class="field-odd"><p><span><code class="xref php php-obj docutils literal notranslate"><span class="pre">ResponseInterface</span></code></span></p>
</dd>
</dl>
<p>Adds response headers for CORS.</p>
</dd></dl>
<dl class="php method">
<dt class="sig sig-object php" id="CodeIgniter\HTTP\Cors::handlePreflightRequest">
<span class="sig-prename descclassname"><span class="pre">CodeIgniter\HTTP\Cors::</span></span><span class="sig-name descname"><span class="pre">handlePreflightRequest</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="pre">RequestInterface</span> <span class="pre">$request</span></em>, <em class="sig-param"><span class="pre">ResponseInterface</span> <span class="pre">$response</span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">&#x2192;</span> <span class="sig-return-typehint"><span class="pre">ResponseInterface</span></span></span><a class="headerlink" href="#CodeIgniter\HTTP\Cors::handlePreflightRequest" title="Permalink to this definition"></a></dt>
<dd><dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>$request</strong> (<span><code class="xref php php-obj docutils literal notranslate"><span class="pre">RequestInterface</span></code></span>) Request instance</p></li>
<li><p><strong>$response</strong> (<span><code class="xref php php-obj docutils literal notranslate"><span class="pre">ResponseInterface</span></code></span>) Response instance</p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p>Response instance</p>
</dd>
<dt class="field-odd">Return type<span class="colon">:</span></dt>
<dd class="field-odd"><p><span><code class="xref php php-obj docutils literal notranslate"><span class="pre">ResponseInterface</span></code></span></p>
</dd>
</dl>
<p>Handles Preflight Requests.</p>
</dd></dl>
<dl class="php method">
<dt class="sig sig-object php" id="CodeIgniter\HTTP\Cors::isPreflightRequest">
<span class="sig-prename descclassname"><span class="pre">CodeIgniter\HTTP\Cors::</span></span><span class="sig-name descname"><span class="pre">isPreflightRequest</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="pre">IncomingRequest</span> <span class="pre">$request</span></em><span class="sig-paren">)</span> <span class="sig-return"><span class="sig-return-icon">&#x2192;</span> <span class="sig-return-typehint"><span class="pre">bool</span></span></span><a class="headerlink" href="#CodeIgniter\HTTP\Cors::isPreflightRequest" title="Permalink to this definition"></a></dt>
<dd><dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><ul class="simple">
<li><p><strong>$request</strong> (<span><a class="reference internal" href="../incoming/incomingrequest.html#CodeIgniter\HTTP\IncomingRequest" title="CodeIgniter\HTTP\IncomingRequest"><code class="xref php php-obj docutils literal notranslate"><span class="pre">IncomingRequest</span></code></a></span>) Request instance</p></li>
</ul>
</dd>
<dt class="field-even">Returns<span class="colon">:</span></dt>
<dd class="field-even"><p>True if it is a Preflight Request.</p>
</dd>
<dt class="field-odd">Return type<span class="colon">:</span></dt>
<dd class="field-odd"><p><span><code class="xref php php-obj docutils literal notranslate"><span class="pre">bool</span></code></span></p>
</dd>
</dl>
<p>Checks if the request is a Preflight Request.</p>
</dd></dl>
</section>
</section>
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