CORS with Dart, how do I get it to work?

Was facing the same problem. Below is my server code. It just prints the query parameters. Added access control headers to fix the issue.

    HttpServer.bind('127.0.0.1', 8080).then((server){    server.listen((HttpRequest request){           request.uri.queryParameters.forEach((param,val){        print(param + '-' + val);      });      request.response.headers.add("Access-Control-Allow-Origin", "*");      request.response.headers.add("Access-Control-Allow-Methods", "POST,GET,DELETE,PUT,OPTIONS");      request.response.statusCode = HttpStatus.OK;      request.response.write("Success!");      request.response.close();    });  });

Hope this helps.

you could simplify your life and run both server/client scripts from the same host:port address. There is a small webserver example at http://www.dartlang.org/articles/io/#web-servers that serves static files too. Add your '/api' handler and make sure your client files are in the same directory. The example server is a lot slower than the Dart Editor builtin server that runs on port 3030.

here is my solution:

request.response.headers.add("Access-Control-Allow-Origin", "*");request.response.headers.add("Access-Control-Allow-Headers", "*");request.response.headers.add("Access-Control-Allow-Methods", "POST,GET,DELETE,PUT,OPTIONS");