I am having issues posting to my Camunda application from my Angular 5 application. I have read the other CORS posts on this site, so I will try to show what steps I have taken relating to those below. Unfortunately, I have been unable to resolve the issue so far. It is also worth noting that I am trying to do this behind a corporate proxy, in case that is relevant. Onto the issue:
I am calling a post request using the following code, where ‘this.http’ is an Angular HttpClient object:
When this request is sent, I receive this standard CORS error in Firefox:
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:8080/engine-rest/message. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing).
And in Chrome:
My Camunda file “camunda-bpm-tomcat-7.8.0/server/apache-tomcat-8.0.47/webapps/engine-rest/WEB-INF/web.xml” file looks like this (note the CorsFilter at the top):
<web-app version="2.5" 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_2_5.xsd">
<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>
<filter>
<filter-name>EmptyBodyFilter</filter-name>
<filter-class>org.camunda.bpm.engine.rest.filter.EmptyBodyFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>EmptyBodyFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>CacheControlFilter</filter-name>
<filter-class>org.camunda.bpm.engine.rest.filter.CacheControlFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>CacheControlFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Http Basic Authentication Filter -->
<!-- <filter>
<filter-name>camunda-auth</filter-name>
<filter-class>
org.camunda.bpm.engine.rest.security.auth.ProcessEngineAuthenticationFilter
</filter-class>
<init-param>
<param-name>authentication-provider</param-name>
<param-value>org.camunda.bpm.engine.rest.security.auth.impl.HttpBasicAuthenticationProvider</param-value>
</init-param>
<init-param>
<param-name>rest-url-pattern-prefix</param-name>
<param-value></param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>camunda-auth</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> -->
<filter>
<filter-name>Resteasy</filter-name>
<filter-class>
org.jboss.resteasy.plugins.server.servlet.FilterDispatcher
</filter-class>
<init-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>org.camunda.bpm.engine.rest.impl.application.DefaultApplication</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>Resteasy</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
I have been searching for quite some time but have not found a solution to my problem. I assume I am missing something simple or have messed up a step somewhere, any help would be greatly appreciated 
