Append the following lines before </web-app> to solr-6.2.0/server/etc/webdefault.xml:
   <filter>
       <filter-name>cross-origin</filter-name>
       <filter-class>org.eclipse.jetty.servlets.CrossOriginFilter</filter-class>
   </filter>
   <filter-mapping>
       <filter-name>cross-origin</filter-name>
       <url-pattern>/*</url-pattern>
   </filter-mapping>