oauth - angular2 http.post method throws typeerror{} exception -

i tried change existing angularjs library angular2 need. http.post method in below code throws typeerror {} exception. please stuck on this.

login() {   return new promise((resolve, reject) => {     if(typeof jssha !== "undefined") {       var signatureobj = (new oauthutility()).createsignature("post", this.magentooptions.baseurl+"/oauth/initiate", this.oauthobject, {oauth_callback: "http://localhost/callback"}, this.magentooptions.clientsecret, null);                                          let headersinitiate = new headers();       headersinitiate.append('authorization',signatureobj.authorization_header);       headersinitiate.append('content-type','application/x-www-form-urlencoded');       let url = this.magentooptions.baseurl + "/oauth/initiate";       let callback = "oauth_callback=http://localhost/callback";        try{         this.http.post(url, callback,{headers: headersinitiate})          .subscribe(           (result) => {           console.log("i inside");           var rparameters = (result).split("&");                             .....       }       catch(exception){         console.log(exception)       } 

you should try that:

var signatureobj = (new oauthutility()).createsignature("post",       this.magentooptions.baseurl+"/oauth/initiate", this.oauthobject,      {oauth_callback: "http://localhost/callback"},      this.magentooptions.clientsecret, null);    let headersinitiate = new headers();  headersinitiate.append('authorization',           signatureobj.authorization_header); headersinitiate.append('content-type',           'application/x-www-form-urlencoded'); let url = this.magentooptions.baseurl + "/oauth/initiate";  let payload = ' ... '; this.http.post(url, payload,{headers: headersinitiate})     .subscribe(       (result) => {         console.log("i inside");         var rparameters = (result).split("&");         (...)       }); 

here comments have on code:

• the second parameter of post method should string corresponding payload not callback. see headers want send url-encoded form, need create own
• the try catch isn't necessary since executing http asynchronous , errors can "catched" within second parameter (another callback) of subscribe method.
• you don't need @ promise. http, angular2 uses observables under hood. target asynchronous processing well.

after fixing of this, think won't have error anymore...

hope helps you, thierry