angular http请求头部信息设置

const headers = new Headers({

'Content-Type': 'application/x-www-form-urlencoded; charset=utf-8',

'Accept': '*!/'

});

const params = 'username=' + data.username + '&password=' + data.password + '&key=' + data.key + '&verifyCode=' + data.verifyCode;

return this.ht.post(`${this.config.urlauth}/login`, params, {headers: headers}).map(value => value);

httpOptions = {

　　headers: new HttpHeaders().set('Content-Type', 'application/json')

　　.set('Content-Type', 'application/x-www-form-urlencoded')

}

const headers = new HttpHeaders({

'Content-Type': 'application/json'

});

const url= ``;

return this.http.post(url,null,{headers: headers}).pipe(

map(res=>res)

)