wcf - Reason: CORS header ‘Access-Control-Allow-Origin’ does not match ‘(null)’ in Angular 2 -


i have post service in wcf has object parameter shown below:

    [operationcontract]     [webinvoke(uritemplate = "placequestion",         requestformat = webmessageformat.json,         responseformat = webmessageformat.json,          method = "post",         bodystyle = webmessagebodystyle.bare)]     string placequestion(questions question);

in web.config file, have add access-control:

<httpprotocol>      <customheaders>         <add name="access-control-allow-origin" value="*"/>         </customheaders> </httpprotocol>

now in angular service tried call method follows:

    var json = json.stringify({         type : 0,         question: "testing"     });      var url = 'http://localhost:49753/restserviceimpl.svc/placequestion';      var params = 'json=' + json;     var headers = new headers();     headers.append('content-type', 'application/json');      return this._http.post(url, params, {         headers: headers     })     .map(res => res.json());

but when run program got error. btw, angular program running in localhost:4200.

cross-origin request blocked: same origin policy disallows reading remote resource @ http://localhost:49753/restserviceimpl.svc/placequestion. (reason: cors header ‘access-control-allow-origin’ not match ‘(null)’).

what seems problem?


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