如何使用“内容类型”：“ application / x-www-form-urlencoded”发出发布请求？

Question

I need to make a request to get a toke in oAuth2 authentication server.

I can make the request in postman and get the token, can't make the same request from angular 4.

My CORS is well-configured cause other requests are working perfectly.

Here are the details of HTTP request.

POST /oauth/token HTTP/1.1
Host: localhost:8080
Authorization: Basic YXBwbGljYXRpb246c2VjcmV0
Content-Type: application/x-www-form-urlencoded
Cache-Control: no-cache
Postman-Token: 9f9582e9-fe73-499f-d7f7-82498a974e39

grant_type=password&username=pedroetb&password=password

In angular 4, I tried this way

let headers = new Headers();
    headers.append('Content-Type', 'application/x-www-form-urlencoded');
    headers.append("Authorization","Basic YXBwbGljYXRpb246c2VjcmV0");

    var obtainTokenUrl = 'http://localhost:8080/oauth/token';

    this._http.post(obtainTokenUrl + "?grant_type=password&username=pedroetb&password=password", null, {headers: headers}).subscribe(response => {
      console.log(response);
    });

But this is not working.

This is the screenshots of the postman request Headers:

Body:

So how can I make this same request from angular 4?

Answer 1

Here is my simple code for retrieving data of users. See, headers are given as header options. You can view more in the docs

createUser(user: User): Observable<User> {
    const submittedUser = JSON.stringify(user); // user is form-submitted data object
    const headers = new Headers ({ 'Content-Type': 'application/json' });
    const options = new RequestOptions({headers: headers});
    return this.http.post(baseURL + 'user/create', submittedUser, options)
      .map((response: Response) =>  {this.processHttpmsgService.extractData(response);})
      .catch(error=> Observable.throw(error));
  }

Docs for HeaderOptions

Answer 2

PostRequest(url:string,data:any) {

var headers = new Headers();

let req = JSON.stringify(data);

 this.onRequest("request: " + url + "data: " + req);

headers.append ("content-Type","application/json");
headers.append("charset","utf-8;");
headers.append("Access-Control-Allow-Origin", "*");
var token = localStorage.getItem('token');
headers.append("Authorization","Bearer "+ token);

 let options = new RequestOptions({ headers: headers });
console.log(options);

  // don't have the data yet
 return new Promise(resolve => {

   this.http.post(url,req,options)
   .map(res => res.json())
   .subscribe(data => {
     resolve(data);

     this.onSuccess(data);
  }
  ,error => {
 this.onError(error);
  }
  );
});

}

also do not forget to import import {Http, Headers,RequestOptions} from '@angular/http';