[Network error]: TypeError: Network request failed

Question

我第一次尝试apollo。我的后端服务器是 Phoenix 框架（长生不老药）。和运行在 http://localhost:4000/api 所以我尝试在我的代码中像这样使用 apollo 进行第一次查询。

import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import ApolloClient from 'apollo-boost';
import { gql } from 'apollo-boost';
const client = new ApolloClient(
  {
    uri: 'http://localhost:4000/api',
  }
);
client.query({
   query: gql`
     { 
        users {
          name
          email
        } 
     `}
}).then(result => console.log(result));

但是我得到一个错误。

[Network error]: TypeError: Network request failed

    node_modules/expo/build/logs/LogSerialization.js:166:14 in _captureConsoleStackTrace
    node_modules/expo/build/logs/LogSerialization.js:41:24 in serializeLogDataAsync
    ... 9 more stack frames from framework internals

[Unhandled promise rejection: Error: Network error: Network request failed]

    http://192.168.1.8:19001/node_modules/expo/AppEntry.bundle?platform=android&dev=true&minify=false&hot=false:124432:28 in new ApolloError
    node_modules/apollo-client/bundle.umd.js:1587:12 in <anonymous>
    node_modules/apollo-client/bundle.umd.js:2007:12 in info.listeners.forEach$argument_0
    <anonymous>:null in Set.forEach
    node_modules/apollo-client/bundle.umd.js:2005:17 in queries.forEach$argument_0
    <anonymous>:null in Map.forEach
    node_modules/apollo-client/bundle.umd.js:2003:11 in QueryManager.prototype.broadcastQueries
    http://192.168.1.8:19001/node_modules/expo/AppEntry.bundle?platform=android&dev=true&minify=false&hot=false:125823:31 in <unknown>
    node_modules/promise/setimmediate/core.js:37:11 in tryCallOne
    node_modules/promise/setimmediate/core.js:123:14 in setImmediate$argument_0

而且在我的服务器日志中什么也没说。我认为我的客户甚至不接触服务器。我错过了什么？有任何想法吗？ :(

Answer 1

事实是，iOS 在模拟器中是运行，而 Android 在模拟器中是运行。

本地主机指向代码所在的环境运行。仿真器模拟真实设备，而模拟器只是模仿设备。因此 Android 上的本地主机指向模拟的 Android 设备。而不是您的服务器运行所在的机器。解决办法是把localhost换成你机器的IP地址。

尝试将 http://localhost:4000 更改为 http://10.0.2.2:4000/

[Network error]: TypeError: Network request failed

[Network error]: TypeError: Network request failed

elixir

apollo

phoenix-framework

react-native

absinthe