如何访问angular5 httpclient答案？

import { HttpClient } from '@angular/common/http';

constructor(private http: HttpClient) { }

this.http.get(url).subscribe((response) => {
  // 处理响应数据
}, (error) => {
  // 处理错误
});

this.http.post(url, data).subscribe((response) => {
  // 处理响应数据
}, (error) => {
  // 处理错误
});

this.http.put(url, data).subscribe((response) => {
  // 处理响应数据
}, (error) => {
  // 处理错误
});

this.http.delete(url).subscribe((response) => {
  // 处理响应数据
}, (error) => {
  // 处理错误
});