Laravel can not understand formData parameters - laravel

Question

According to this question:
Angular5 HttpClient send data but server can not understand its params
I send username, password and _token parameters to server through FormData in angular5. I set header to
'Content-Type': 'application/x-www-form-urlencoded'
now, I faced another problem in server.
Request header changed to
------WebKitFormBoundaryGOu5izF9uMKIXDW1
Content-Disposition: form-data; name:"username"
a#a.com
------WebKitFormBoundaryGOu5izF9uMKIXDW1
Content-Disposition: form-data; name="password"
123456
------WebKitFormBoundaryGOu5izF9uMKIXDW1
Content-Disposition: form-data; name="_token"
[object Object]
------WebKitFormBoundaryGOu5izF9uMKIXDW1--
Now, Laravel could not read request parameters in this way:
$request->input('username') // returns null
$request->input() // returns whole request content, not an object or array
How could I read request parameters ?
e.g. Is there any regular expression that can help me? or any patches in higher Laravel versions that I can use?
Laravel version: 5.2

Answer 1

Does your controller in Laravel have these included?
use Illuminate\Http\Request;
use Illuminate\Http\Response;
and does your function look like this?
public function signIn(Request $request, Response $response){
$output = $request->input('username');
return $output;
}
What we are doing above is getting the output of the response which we are wanting username and return that so you should get the username back
EDIT
Does your Angular service look like this
login(username:string, password:string) {
let formData = new FormData();
formData.append('username', username);
formData.append('password', password);
return this._http.post(
'http://oauth-api/api/me/signin',
formData
);
}