Javascript ExpressJS Node.js角度错误：获取OAuth2 API授权令牌时getaddrinfo ENOTFOUND

我已经编写了一个angular应用程序，只要点击一个按钮，就会向Node/Express.js端点发出HTTP post请求，请求获得授权令牌

在《邮差》中，我成功地做到了以下几点：

已配置基本OAuth2授权令牌的相关凭据并获取访问令牌

我使用访问令牌调用restful端点，并在ldap目录上创建一个用户

在angular应用程序中，我创建了以下关键组件：

用户界面

AuthResponse接口

身份验证服务

用户界面组件

以下是angular frontend应用程序中Auth服务的逻辑摘录：

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { User } from  './../auth/user';
import { AuthResponse } from  './../auth/auth-response';
import { tap } from  'rxjs/operators';
import { Observable, BehaviorSubject } from  'rxjs';

@Injectable({
  providedIn: 'root'
})
export class AuthService {

  AUTH_SERVER = "http://localhost:3000";
  authSubject  =  new  BehaviorSubject(false);

  constructor(private httpClient: HttpClient) { }

  register(user: User): Observable<AuthResponse> {
      return this.httpClient.post<AuthResponse>(`${this.AUTH_SERVER}/register`, user).pipe(
        tap((res:  AuthResponse ) => {

          if (res.token) {
            console.log("ACCESS_TOKEN : "+ res.token.access_token);
            localStorage.set("ACCESS_TOKEN", res.token.access_token);
            localStorage.set("EXPIRES_IN", res.token.token_type);
            localStorage.set("ACCESS_TOKEN", res.token.expires_in);
            localStorage.set("EXPIRES_IN", res.token.refresh_token);
            this.authSubject.next(true);
          }
        })

      );
    }
}

下面是html片段，该调用包含调用register端点的按钮：

<div>
      <button (click)="register()" >Register</button> 
</div>

my nodejs app.js中的以下端点可以工作：

路由器.get（'/getTestResponse'，（req，res）=>{ api\U助手。进行api\U调用（“”） 。然后（响应=>{ res.json（响应） }) .catch（错误=>{ res.send（错误） }) })

它使用以下辅助函数：

const request = require('request')

module.exports = {
    /*
    ** This method returns a promise
    ** which gets resolved or rejected based
    ** on the result from the API
    */
    make_API_call : function(url){
        return new Promise((resolve, reject) => {
            request(url, { json: true }, (err, res, body) => {
              if (err) reject(err)
              resolve(body)
            });
        })
    }
}

问题是我在angular应用程序中单击register按钮时出现以下错误。 但是，nodejs/register端点正在被触发，即它将从请求对象检索到的用户名和密码记录到控制台：

Entering the server endpoint 
events.js:288
      throw er; // Unhandled 'error' event
      ^

Error: getaddrinfo ENOTFOUND https://[hostname]:[port-no]/osp/a/idm/auth/oauth2/token
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:64:26)
Emitted 'error' event on ClientRequest instance at:
    at TLSSocket.socketErrorListener (_http_client.js:426:9)
    at TLSSocket.emit (events.js:311:20)
    at emitErrorNT (internal/streams/destroy.js:92:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:60:3)
    at processTicksAndRejections (internal/process/task_queues.js:84:21) {
  errno: 'ENOTFOUND',
  code: 'ENOTFOUND',
  syscall: 'getaddrinfo',
  hostname: 'https://[hostname]:[port-no]/osp/a/idm/auth/oauth2/token'
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! registration-express-app@0.0.1 start: `node ./src/app/app.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the registration-express-app@0.0.1 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/admin/.npm/_logs/2020-03-28T08_56_14_947Z-debug.log

---

问题在于http.request选项。基本上，hostname:应该只是hostname，而不是hostname！ 然后对端点URI的其余部分使用path属性，即/xxx/auth/oauth2/token

这使事情有所进展，但我现在遇到另一个错误“错误：证书链中的自签名证书” 我将就此结束这个问题，以确保其他人能够从我的经验中获益。 回馈社会

请参阅下面的一些不错的参考资料：

const request = require('request')

module.exports = {
    /*
    ** This method returns a promise
    ** which gets resolved or rejected based
    ** on the result from the API
    */
    make_API_call : function(url){
        return new Promise((resolve, reject) => {
            request(url, { json: true }, (err, res, body) => {
              if (err) reject(err)
              resolve(body)
            });
        })
    }
}

Entering the server endpoint 
events.js:288
      throw er; // Unhandled 'error' event
      ^

Error: getaddrinfo ENOTFOUND https://[hostname]:[port-no]/osp/a/idm/auth/oauth2/token
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:64:26)
Emitted 'error' event on ClientRequest instance at:
    at TLSSocket.socketErrorListener (_http_client.js:426:9)
    at TLSSocket.emit (events.js:311:20)
    at emitErrorNT (internal/streams/destroy.js:92:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:60:3)
    at processTicksAndRejections (internal/process/task_queues.js:84:21) {
  errno: 'ENOTFOUND',
  code: 'ENOTFOUND',
  syscall: 'getaddrinfo',
  hostname: 'https://[hostname]:[port-no]/osp/a/idm/auth/oauth2/token'
}
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! registration-express-app@0.0.1 start: `node ./src/app/app.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the registration-express-app@0.0.1 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/admin/.npm/_logs/2020-03-28T08_56_14_947Z-debug.log