问题描述

我有一个应用程序，我使用 fetch 对用户进行身份验证.它一直工作到几天前，我没有改变任何东西.刚刚从 react 0.27 升级到 0.28，not fetch 不起作用.

我已经搜索了将近 2 天，并且我已经阅读了 stackoverflow 中的几乎所有问题.大多数用户试图从 localhost 获取某些内容，当他们将其更改为实际 ip address 时，他们就可以正常工作了.但我没有从 localhost 获取任何东西，我的代码也可以正常工作.

这是我的代码:

fetch('http://somesite.com/app/connect', {方法:'POST'，标题:{'接受': '应用程序/json','内容类型':'应用程序/json'，'语言':'en-US','授权':'承载' + access_token，},正文: JSON.stringify({uid:uid，刷新令牌:刷新令牌，令牌:access_token，设备:device_id，设备名称:设备名称，})}).then((响应) => response.json()).then((responseData) => {console.log(JSON.stringify(responseData.body))}).catch((错误)=> {console.log('发生了一些错误');控制台日志(错误)；}).done();

我尝试制作一些新项目，简单，只是使用了一个简单的 fetch 示例来教程，它给出了同样的错误.我试图通过模拟器中的浏览器打开我试图连接到它的网站，它可以工作，但似乎通过我的应用程序无法连接到任何网站/IP.它在 chrome 控制台中给出了这个错误:

TypeError: 网络请求失败在 XMLHttpRequest.xhr.onerror (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:28193:8)在 XMLHttpRequest.dispatchEvent (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:14591:15)在 XMLHttpRequest.setReadyState (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:29573:6)在 XMLHttpRequest.__didCompleteResponse (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:29431:6)在 http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:29506:52在 RCTDeviceEventEmitter.emit (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:13428:23)在 MessageQueue.__callFunction (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:11999:23)在 http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:11906:8在守卫(http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:11857:1)在 MessageQueue.callFunctionReturnFlushedQueue (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:11905:1)

实际上我和这个用户有同样的问题:

I have an app, which im using fetch to authenticate user. it was working till few days ago and i haven't change anything. just upgraded from react 0.27 to 0.28, not fetch is not working.

i have searched for almost 2 days and i have read almost all questions in stackoverflow. most of users trying to fetch something from localhost, and when they change it to actual ip address , they get it to work. but im not fetching anything from localhost, also mine code used to be working.

here is my code :

fetch('http://somesite.com/app/connect', {
      method: 'POST',
      headers: {
        'Accept': 'application/json',
        'Content-Type': 'application/json',
        'language':'en-US',
        'Authorization': 'Bearer ' + access_token,
      },
      body: JSON.stringify({
        uid: uid,
        refresh_token: refresh_token,
        token: access_token,
        device: device_id,
        device_name: device_name,
      })
    })
.then((response) => response.json())
.then((responseData) => {
    console.log(JSON.stringify(responseData.body))
})
.catch((err)=> {
  console.log('Some errors occured');
  console.log(err);
})
.done();

i tried to make some new projects, simple, just used a simple fetch example fro tutorials, it gave same error. i tried to open my website which im trying to connect to it, through browser in emulator, it works, but it seems through my, app cannot connect to any website/ip. it gives this error in chrome console :

TypeError: Network request failed
    at XMLHttpRequest.xhr.onerror (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:28193:8)
    at XMLHttpRequest.dispatchEvent (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:14591:15)
    at XMLHttpRequest.setReadyState (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:29573:6)
    at XMLHttpRequest.__didCompleteResponse (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:29431:6)
    at http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:29506:52
    at RCTDeviceEventEmitter.emit (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:13428:23)
    at MessageQueue.__callFunction (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:11999:23)
    at http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:11906:8
    at guard (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:11857:1)
    at MessageQueue.callFunctionReturnFlushedQueue (http://localhost:8081/index.ios.bundle?platform=ios&dev=true&hot=true:11905:1)

actually i have the same problem as this user here : React-native network request always fails

UPDATE : info.plist from xcode

any help will be appreciated!

You should check out this link: https://github.com/facebook/react-native/issues/8118

Looks like the issue emerged in React Native 0.28. Solution is to "Allow Arbitrary Loads" in the info.plist file found in the ios>build folder that React creates.

If you open the entire ios folder in xcode, then open this info.plist file you can create a new key to Allow Arbitrary Loads and it should fix your issue.

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