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POtomcat 7 cors filter
 

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    <pre><code>Ubuntu 12.10 Tomcat 7.0.41 Chrome 27.0.1453.116 </code></pre> <p>I would like to use Tomcat's new, native <code>CORS</code> filter to allow <code>Access-Control-Allow-Origin: *</code> . The configuration seems simple enough but when I use Chrome's "Developer tools" or Firefox' Firebug to check for <em>Access-Control-Allow-Origin: *</em>, it does not appear in the response header: </p> <pre><code>Request URL:http://XXX.XXX.XX.99:8984/SimpleServlet/simple-servlet Request Method:GET Status Code:200 OK Request Headersview source Accept:text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Encoding:gzip,deflate,sdch Accept-Language:en-US,en;q=0.8 Cache-Control:max-age=0 Connection:keep-alive DNT:1 Host:198.100.45.99:8984 User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/27.0.1453.116 Safari/537.36 Response Headersview source Content-Length:103 Content-Type:text/html;charset=ISO-8859-1 Date:Mon, 24 Jun 2013 00:19:30 GMT Server:Apache-Coyote/1.1 </code></pre> <p>For testing, I've deployed a simple servlet and have configured the following in WEB-INF/web.xml.</p> <pre><code>&lt;?xml version="1.0" encoding="ISO-8859-1"?&gt; &lt;web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3.0.xsd" version="3.0"&gt; &lt;servlet&gt; &lt;servlet-name&gt;SimpleServlet&lt;/servlet-name&gt; &lt;servlet-class&gt;com.javaranch.codebarn.servletjsp.SimpleServlet&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;SimpleServlet&lt;/servlet-name&gt; &lt;url-pattern&gt;/simple-servlet&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;filter&gt; &lt;filter-name&gt;CorsFilter&lt;/filter-name&gt; &lt;filter-class&gt;org.apache.catalina.filters.CorsFilter&lt;/filter-class&gt; &lt;init-param&gt; &lt;param-name&gt;cors.allowed.origins&lt;/param-name&gt; &lt;param-value&gt;*&lt;/param-value&gt; &lt;/init-param&gt; &lt;init-param&gt; &lt;param-name&gt;cors.allowed.headers&lt;/param-name&gt; &lt;param-value&gt;Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers&lt;/param-value&gt; &lt;/init-param&gt; &lt;init-param&gt; &lt;param-name&gt;cors.exposed.headers&lt;/param-name&gt; &lt;param-value&gt;Access-Control-Allow-Origin&lt;/param-value&gt; &lt;/init-param&gt; &lt;!-- &lt;init-param&gt; &lt;param-name&gt;cors.logging.enabled&lt;/param-name&gt; &lt;param-value&gt;true&lt;/param-value&gt; &lt;/init-param&gt; --&gt; &lt;/filter&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;CorsFilter&lt;/filter-name&gt; &lt;url-pattern&gt;/*&lt;/url-pattern&gt; &lt;/filter-mapping&gt; &lt;/web-app&gt; </code></pre> <p>What am I missing? I've also tried Dzhuvinov's java classes/filter and have tried configuring the filter in WEB-INF/web.xml and $CATALINA_BASE/conf/web.xml. What could be blocking this configuration?</p> <p>How can I troubleshoot this? It appears that in the original eBay cors-filter offering, there was a parameter to toggle logging, but this is not reflected in the Tomcat v7.0.41 documentation.</p>
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    1. COCan you provide request headers as well ? The first thing that I would do is to check if browser is adding 'Origin' header to request. As per spec, when browsers detect that a request is a cross-origin request, they add an 'Origin' header along. If request doesn't contain an 'Origin' header then CorsFilter will let the request pass.
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    2. COIf browser is not adding a 'Origin' header to request, that means the request is not a cross-origin request.
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    3. COYou might want to check if request is really a cross origin request. For ex: If a page is served on origin `http://localhost:8080`, then it should be making a request to any origin, but `http://localhost:8080` (for request to be cross origin). To simulate, you can edit your /etc/hosts, and map `127.0.0.1` to ex: `localhost.cors`. Then change your JavaScript to make a request to `http://localhost.cors:8080` from the page which was served from `http://localhost:8080` (or vice-versa).
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