java - Enabling cors in dropwizard not working -

i'm working on dropwizard application , js ui interacte api. need load json data update views have enable cors in dropwizard before that. did staff seems not working because dropwizard returns allways 204 no content.

@override public void run(final bgconfiguration configuration, final environment environment) throws exception {   final map<string, string> params = new hashmap<>();   params.put("access-control-allow-origin", "/*");   params.put("access-control-allow-credentials", "true");   params.put("access-control-expose-headers", "true");   params.put("access-control-allow-headers", "content-type, x-requested-with");   params.put("access-control-allow-methods", "get, post, put, delete, options");   environment.servlets().addfilter("cors", crossoriginfilter.class).setinitparameters(params); } 

the bug here filter hasn't been configured url path via addmappingforurlpatterns method.

this worked me using dropwizard 0.7.1:

import org.eclipse.jetty.servlets.crossoriginfilter; import javax.servlet.dispatchertype; import java.util.enumset;  public void run(configuration conf, environment environment)  {     // enable cors headers     final filterregistration.dynamic cors =         environment.servlets().addfilter("cors", crossoriginfilter.class);      // configure cors parameters     cors.setinitparameter("allowedorigins", "*");     cors.setinitparameter("allowedheaders", "x-requested-with,content-type,accept,origin");     cors.setinitparameter("allowedmethods", "options,get,put,post,delete,head");      // add url mapping     cors.addmappingforurlpatterns(enumset.allof(dispatchertype.class), true, "/*"); } 

i'm assuming you're testing live in browser, can verify via cli curl command this:

$ curl -h "origin: http://example.com" \        -h "access-control-request-method: post" \        -h "access-control-request-headers: x-requested-with" \        -x options --verbose \        http://localhost:8080 

you should see bunch of access-control-* http headers in response.