René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"HttpInterceptor示例 总是发送请求两次","articleBody":"import { Injectable } from '@angular/core';\r\nimport { Request, Response } from '@angular/http';\r\nimport { Observable } from 'rxjs';\r\nimport {Router} from \"@angular/router\";\r\n\r\n@Injectable()\r\nexport class HttpInterceptor{\r\n  constructor(private router: Router){\r\n\r\n  }\r\n    beforeRequest(request: Request): Request {\r\n      //请求发出前处理\r\n      console.log('我在请求前');\r\n      return request;\r\n\r\n    }\r\n\r\n    afterResponse(res: Observable\u003cResponse\u003e): Observable\u003cany\u003e{\r\n      //请求响应后的处理\r\n      res.subscribe((data)=\u003e {\r\n        console.log(data);\r\n        console.log('我在请求后');\r\n      });\r\n      return res;\r\n    }\r\n}\r\n\r\n//app.module.ts,  providers声明，\r\n{provide: Http, useFactory: httpFactory, deps: [XHRBackend, RequestOptions]} ],\r\n\r\n每次发送的请求都是两次，如何解决啊。。。","author":{"url":"https://github.com/qiaoluheng","@type":"Person","name":"qiaoluheng"},"datePublished":"2017-10-17T15:32:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/51/issues/issues/51"}