How I add Headers to http.get or http.post in Typescript and angular 2?

问题

getHeroes (): Observable<Heros[]> {
    return this.http.get(this.heroesUrl)
      .map(this.extractData)
      .catch(this.handleError);
  }

Where I add the headers and how? looking for a simple example.

回答1:

You can define a Headers object with a dictionary of HTTP key/value pairs, and then pass it in as an argument to http.get() and http.post() like this:

const headerDict = {
  'Content-Type': 'application/json',
  'Accept': 'application/json',
  'Access-Control-Allow-Headers': 'Content-Type',
}

const requestOptions = {                                                                                                                                                                                 
  headers: new Headers(headerDict), 
};

return this.http.get(this.heroesUrl, requestOptions)

Or, if it's a POST request:

const data = JSON.stringify(heroData);
return this.http.post(this.heroesUrl, data, requestOptions);

回答2:

if someone facing issue of CORS not working in mobile browser or mobile applications, you can set ALLOWED_HOSTS = ["your host ip"] in backend servers where your rest api exists, here your host ip is external ip to access ionic , like External: http://192.168.1.120:8100

After that in ionic type script make post or get using IP of backened server

in my case i used django rest framwork and i started server as:- python manage.py runserver 192.168.1.120:8000

and used this ip in ionic get and post calls of rest api

来源：https://stackoverflow.com/questions/42352854/how-i-add-headers-to-http-get-or-http-post-in-typescript-and-angular-2