How to Fix CORS issue for Solr
==============================
1.  Copy two jar files into $SOLR_HOME/example/solr-webapp/webapp/WEB-INF/lib/:
      - jetty-servlets-8.1.14.v20131031.jar
      - jetty-util-8.1.14.v20131031.jar
        * NOTE:  jetty files v9.x.x do not work.
2.  Edit $SOLR_HOME/example/solr-webapp/webapp/WEB-INF/web.xml, by inserting the below <filter> right after <web-app> and before the other <filter> OR
    you can just use the web.xml file in this directory:
    * NOTE: the order of <filter> does matter

  <!-- =================================== -->
  <!--      Enable CORS for Banana         -->
  <!-- =================================== -->
  <filter>
    <filter-name>cross-origin</filter-name>
    <filter-class>org.eclipse.jetty.servlets.CrossOriginFilter</filter-class>
    <init-param>
      <param-name>allowedOrigins</param-name>
      <param-value>*</param-value>
    </init-param>
    <init-param>
      <param-name>allowedMethods</param-name>
      <param-value>GET,POST,OPTIONS,DELETE,PUT,HEAD</param-value>
    </init-param>
    <init-param>
      <param-name>allowedHeaders</param-name>
      <param-value>origin, content-type, accept</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>cross-origin</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

3.  That's it. Restart Solr server and it should work!