拒绝的HTTP承诺不会达到catch块

问题描述

我在Axios上使用VueJ(和Vuex)与Express Api进行通信.我可以删除自己的使用服务的用户帐户

I use VueJs (and Vuex) with Axios to communicate with an Express Api. I can delete my own user account consuming a service

import api from '@/services/api.js';

export default {
  deleteAccount: () => api().delete('/users')
};

其中 api 是 axios 实例.我不需要传递用户ID，因为api通过令牌识别用户.

where api is the axios instance. I don't need to pass in a user ID because the api identifies the user by the token.

在我的设置视图中，我可以使用此服务

Within my settings view I can consume this service

<script>
import { mapActions } from 'vuex';

import UserService from '@/services/users';

export default {
  name: 'Settings',
  methods: {
    ...mapActions('alert', [
      'showSuccessAlert',
      'showErrorAlert'
    ])
    deleteAccount: async function() {
      try {
        await UserService.deleteAccount();

        this.showSuccessAlert({ message: 'Account was deleted successfully' });
        // other stuff
      } catch (error) {
        this.showErrorAlert({ message: error.message });
      }
    }
  }
};
</script>

调用 UserService.deleteAccount()会返回未完成的承诺.使用 await 返回api响应.

Calling UserService.deleteAccount() returns me a pending promise. Using await returns me the api response.

目前，出于测试目的，该api始终返回 500 .我认为，如果Promise被拒绝，代码将始终直接跳转到catch块中.在这里，代码返回被拒绝的Promise(并向控制台写入内部服务器错误"，但传递并显示成功警报/从不执行catch块中的代码.

Currently the api always returns a 500 for testing purposes. I thought, that if the Promise gets rejected the code will always jump directly into the catch block. Here, the code returns a rejected Promise (and writes a "Internal Server Error" to the console but passes and shows a success alert / never executes the code from the catch block.

代码有什么问题?我误会了诺言吗?

What is wrong with the code? Did I misunderstand promises?

更新

我的axios实例

import axios from 'axios';

import TokensService from '@/services/tokens.js';
import store from '@/store/store.js';

function getTokenString() {
  return `Bearer ${TokensService.getToken()}`;
}

export default () => {
  const instance = axios.create({
    baseURL: 'http://localhost:3000/',
    headers: {
      'Content-Type': 'application/json',
      Authorization: getTokenString(),
    },
  });

  instance.interceptors.request.use((config) => {
    config.headers.Authorization = getTokenString();
    return config;
  }, (err) => Promise.reject(err));

  instance.interceptors.response.use((res) => res, (err) => {
    if (err.response.status === 401) {
      store.dispatch('authentication/destroySession');
      store.dispatch('alert/showErrorAlert', { message: err.message });
    }

    return err;
  });

  return instance;
};

调用 api().delete()与 axios.delete('http://localhost:3000/users')

推荐答案

尝试在此处返回被拒绝的承诺

try returning a rejected promise here

  instance.interceptors.response.use((res) => res, (err) => {
    if (err.response.status === 401) {
      store.dispatch('authentication/destroySession');
      store.dispatch('alert/showErrorAlert', { message: err.message });
    }

    return Promise.reject(err);
  });

根据示例 https://github.com/axios/axios#interceptors

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