django rest framework - how to handle token authentication in Angular Dart? -

first time dealing spa. have back-end restful service returns token when user signs in. know supposed send token through headers in each request thinking in saving token in file , create service or class loads token in every component don't know if approach can't find documentation angular dart this.

i saved token first in localstorage tobe o suggested:

future login(username, password) async {     string url = 'http://127.0.0.1:8000/auth/login/';     var response =     await _client.post(url, body: {'username': username, 'password': password});     map mapped_response = _decoder.convert(response.body);     window.localstorage.addall({"token": mapped_response["key"]}); } 

but still receiving 401 responses when tried user information, function:

  future check_authentification () async {       string _headers_key = "authorization";       string _headers_value =  "token "+window.localstorage["token"];       var response = await _client.get("http://127.0.0.1:8000/auth/user/", headers: {_headers_key: _headers_value});       user_data = _decoder.convert(response.body);       response_status = response.statuscode;   } 

i couldn't authorized because django-rest-auth wasn't configured token authorization. solution add tokenauthentication default authentication classes in django settings.

rest_framework = { 'default_authentication_classes': (     'rest_framework.authentication.basicauthentication',     'rest_framework.authentication.sessionauthentication',     'rest_framework.authentication.tokenauthentication', )}