Issue Enabling CORS

[BootstrapB]

I need CORS enabled so I can get WMS layers from geoserver with Cesium. When running my own version of geoserver(not dockerized) I just edit /tomcat/webapps/geoserver/WEB-INF/web.xml and uncomment the CORS filters. I copied the web.xml file, edited it, and then ran docker with the new web.xml mounted by doing: docker run --name "geoserver" --link postgis:postgis -v ~/web.xml:/usr/local/tomcat/webapps/geoserver/WEB-INF/web.xml -p 8080:8080 -d -t kartoza/geoserver

After making this change when I got to localhost:8080/geoserver/index.html I get a 404 error. Any idea why this is happening or know of a way to enable CORS?

EDIT: Please close this issue, I realized I was editing the wrong the web.xml file. For anyone having this issue, you have to edit the /tomcat/conf/web.xml (not /tomcat/webapps/geoserver/WEB-INF/web.xml) file and in the filter section add this:

CorsFilter org.apache.catalina.filters.CorsFilter CorsFilter /*

[ericsvendsen]

Took me a while to figure out what exactly needed to be added based on your edited comment. Here it is in case anyone else looking at this is as clueless as me 😀

<filter>
    <filter-name>CorsFilter</filter-name>
    <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>CorsFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

[BootstrapB]

Oops sorry about it being unclear, the formatting must have messed up when I pasted my code. Thanks for making it more clear!

[eg-novelt]

Hello, for me what worked was a few extra init-params, in /usr/local/tomcat/conf/web.xml as follows:

<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.headers</param-name>
        <param-value>If-Mofidied-Since,Range,Origin</param-value>
    </init-param>
</filter>

<filter-mapping>
    <filter-name>CorsFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

[JWDobken]

This solved my problem!

However, I still get these console errors:

Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:8600/geoserver/test/wms?bbox=-672645.8489095494,4263351.689633992,-670199.8640044257,4265797.674539115&format=image/png&CRS=EPSG:3857&service=WMS&version=1.3&request=GetMap&srs=EPSG:3857&transparent=true&width=256&height=256&layers=test:T1. (Reason: CORS request did not succeed).[Learn More]

Can this be a feature implementation?