Angular 4 Http POST not working

问题:

I hope everyone is doing great. I've recently started working with angular 4.4, i've been trying to post data to my api server, but unfortunately it's not working. I've spent like 2 days on it but still no success. And have already tried 6-7 article even from angular.io. I've tried both Http and Httpclient modules but nothing seems to be working.

The problem is, whenever i try to post data to my server, Angular makes http OPTIONS type request instead of POST.

this.http.post('http://myapiserver.com', {email: '[e-mail]'}).subscribe(
    res => {
        const response = res.text();
    }
);

And i've also tried to send custom options with the request but still no success.

const headers = new Headers({ 'Content-Type': 'x-www-form-urlencoded' });
const options = new RequestOptions({ headers: headers });
options.method = RequestMethod.Post;
options.body = {name: 'Adam Smith'};
//options.body = JSON.stringify({name: 'Adam Smith'}); // i also tried this
//options.body = 'param1=something&param2=somethingelse'; // i also tried this

I was using ASP.NET core 2.0, but since it wasn't working i also tried simple php code, Here is the server side code for php. And it's also not working.

<?php
print_r($_POST);
?>

Note: Cors are also enabled on server. Plus I also tried simple get request and its working perfectly fine.

I'll really appreciate some help.

Thanks in advance

回答1:

I solved it by setting the Content-Type to application/x-www-form-urlencoded:

  const headers = new Headers({ 'Content-Type': 'application/x-www-form-urlencoded' });
  const options = new RequestOptions({ headers: headers });
  const params = new URLSearchParams();
  params.append('mypostField', 'myFieldValue');
  http.post('myapiendpoint.com', params, options).subscribe();

回答2:

have you tried passing headers as the third argument in the post menthod:

this.http.post('http://myapiserver.com', JSON.stringify({name: 'Adam Smith'}), { headers: new Headers({ 'Content-Type': 'application/json' }) }).subscribe(
    res => {
        const response = res.text();
    }
);

make sure you import Headers from @angular/http

回答3:

I had same problem and i used like this.(using FormData) try it. It work for me.

let formdata = new FormData();
formdata.append('email', '[e-mail]');

this.http.post('http://myapiserver.com', formdata).subscribe(
    res => {
        const response = res.text();
    }
);

回答4:

import { HttpClient, HttpHeaders } from '@angular/common/http'; import { Observable } from 'rxjs';

saveGame(route,game):Observable<any>{

  let json = JSON.stringify(game);
        let params = 'json=' + json;

  let headers = new HttpHeaders().set('Content-Type', 'application/x-www-form-urlencoded');
  return this.http.post(this.URL + route, params, { headers: headers });

}