Tomcat CORS filter

Question

I want to enable tomcat CORS filter, i added this to web.xml:

    CorsFilter
    or         


        

Answer 1

I get a similar problem and I found something that worked for me on tomcat doc tomcat-doc-CORSFilter I use filter and init-param as below:

<filter>
  <filter-name>CorsFilter</filter-name>
  <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
  <init-param>
    <param-name>cors.allowed.origins</param-name>
    <param-value>*</param-value>
  </init-param>
  <init-param>
    <param-name>cors.allowed.methods</param-name>
    <param-value>GET,POST,HEAD,OPTIONS,PUT</param-value>
  </init-param>
  <init-param>
    <param-name>cors.allowed.headers</param-name>
    <param-value>Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers</param-value>
  </init-param>
  <init-param>
    <param-name>cors.exposed.headers</param-name>
    <param-value>Access-Control-Allow-Origin,Access-Control-Allow-Credentials</param-value>
  </init-param>
  <init-param>
    <param-name>cors.support.credentials</param-name>
    <param-value>true</param-value>
  </init-param>
  <init-param>
    <param-name>cors.preflight.maxage</param-name>
    <param-value>10</param-value>
  </init-param>
</filter>
<filter-mapping>
  <filter-name>CorsFilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

Hope it helps!

Answer 2

In my case with Ueditor，the X-Requested-With should be X_Requested_With.

Answer 3

The filter org.apache.catalina.filters.CorsFilter seek first a header in the request: Origin. If this header does not exist, the filter does not add any header in the response. Perhaps for that reason does not work.

Additionally, in a POST request, look for the header Content-Type. Something similar happens to other methods. May you want to see the code of this filter. In another way, there is a flowchart: