c# - Web Api 2 Handle OPTIONS Requests -

i have web api 2 backend hosted on azure , angularjs forntend. understand of http request use pre-check options request. question how implement backend way, options requests return 200 if there action in controller handle following get/post/put/delete/....

non elegant way solve task adding in each controller manually

[acceptverbs("options")] public httpresponsemessage options() {     var resp = new httpresponsemessage(httpstatuscode.ok);     resp.headers.add("access-control-allow-origin", "*");     resp.headers.add("access-control-allow-methods", "get,delete");      return resp; } 

or override messagehandlers

 public class optionshttpmessagehandler : delegatinghandler {   protected override task<httpresponsemessage> sendasync(   httprequestmessage request, cancellationtoken cancellationtoken)   {     if (request.method == httpmethod.options)       {          var apiexplorer = globalconfiguration.configuration.services.getapiexplorer();            var controllerrequested = request.getroutedata().values["controller"] string;                         var supportedmethods = apiexplorer.apidescriptions.where(d =>               {                   var controller = d.actiondescriptor.controllerdescriptor.controllername;                 return string.equals(                     controller, controllerrequested, stringcomparison.ordinalignorecase);             })           .select(d => d.httpmethod.method)           .distinct();        if (!supportedmethods.any())          return task.factory.startnew(              () => request.createresponse(httpstatuscode.notfound));        return task.factory.startnew(() =>         {             var resp = new httpresponsemessage(httpstatuscode.ok);             resp.headers.add("access-control-allow-origin", "*");             resp.headers.add(                 "access-control-allow-methods", string.join(",", supportedmethods));              return resp;         }); }  return base.sendasync(request, cancellationtoken);    } } 

and in config

globalconfiguration.configuration.messagehandlers.add(new optionshttpmessagehandler()); 

even second option not perfect though... no native build in support