Question

我使用axios来调用后端服务器。使用redux-saga，我可以轻松控制服务器的副作用。

import {call, put, takeEvery} from "redux-saga/effects";
import {REQUEST_FAILED, REQUEST_SUCCESS, ROOT_URL, SUBMIT_USERNAME_PASSWORD} from "../../constants";
import axios from "axios/index";

const shootApiTokenAuth = (values) => {
  const {username, password} = values;
  return axios.post(`${ROOT_URL}/api-token-auth/`,
    {username, password});
};

function* shootAPI(action) {
  try {
    const res = yield call(shootApiTokenAuth, action.payload);
    const {history} = action.payload;
    yield put({
      type: REQUEST_SUCCESS,
      payload: res
    });
    history.push('/companies'); //push user to `/companies` page
  } catch (err) {
    yield put({
      type: REQUEST_FAILED,
      payload: err
    });
  }
}

export function* watchSubmitBtn() {
  yield takeEvery(SUBMIT_USERNAME_PASSWORD, shootAPI);
}

问题： 当后端服务器关闭时。它不会将任何错误返回给我。浏览器会引发错误Failed to load resource: net::ERR_CONNECTION_REFUSED

我在callback method上看过以前的答案，但我更喜欢axios和redux-saga而不是callback

我曾尝试console.log(err)。我仍在搜索它们以获取错误消息并将其与服务器响应错误区分开来。

Error: Network Error
    at createError (createError.js:16)
    at XMLHttpRequest.handleError (xhr.js:87)

问题：
如何使用axios和redux-saga来抓住err？

Answer 1

如果你将try / catch放在axios请求本身，那么你可以在原因上获得更多的粒度。

https://gist.github.com/fgilio/230ccd514e9381fafa51608fcf137253

您可能希望使用自定义错误格式和错误减少器来处理适当的不同类型的错误。例如，如果你得到了一个响应，你可以解析它并将其添加到错误中，否则你知道有一个应用程序级错误，你将使用＆＃39; Oops＆＃39;页面或类似的东西。

Answer 2

case REQUEST_FAILED:
      //Probably it can failed by 2 reason
      //1. 404 from server
      //2. network is down
      if (action.payload.response === undefined) {
        return {
          token: undefined,
          message: 'Network is down',
          isAuthenticated: false,
          statusCode: 406
        }
      } else {
        const tmp = action.payload.response.request.response;
        const tmp2 = JSON.parse(tmp);
        return {
          token: undefined,
          message: tmp2.non_field_errors[0],
          isAuthenticated: false,
          statusCode: action.payload.response.status
        };
      }

redux-saga catch无法加载资源：net :: ERR_CONNECTION_REFUSED

2 个答案: