Apache Tomcat No 'Access-Control-Allow-Origin' header is present on the requested resource

Question

I am getting the following CORS message:

Access to XMLHttpRequest at 'http://localhost:8080/ottoautomaatitv2/webservice?postitoimipaikka=mikkeli' 
from origin 'http://localhost:4200' has been blocked by CORS policy: 
No 'Access-Control-Allow-Origin' header is present on the requested resource.

What I have done to try to fix the issue is to add a CORS filter , but that didn't solve the issue.

<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>

The only way I can get around the issue is by using Google Chrome with a --user-data-dir="C:/Chrome dev session" --disable-web-security target, but this is not ideal for me. How do I enable Access-Control-Allow-Origin on Apache Tomcat?

Answer 1

I fixed the access-control-allow-origin header error given by an Angular app by adding a CORS filter alongside some attributes to web.xml of Tomcat.

<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>http://localhost:4200</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>