当我使用react-native init (RN版本0.29.1)创建一个全新的项目，并在渲染方法中获取公共facebook演示电影API时，它抛出了一个网络请求失败。有一个非常无用的堆栈跟踪，我不能调试网络请求在chrome控制台。这是我发送的fetch:
fetch('http://facebook.github.io/react-native/movies.json')
.then((response) => response.json())
.then((responseJson) => {
return responseJson.movies;
})
.catch((error) => {
console.error(error);
});
当前回答
这里的问题是iOS默认不允许HTTP请求，只允许HTTPS。如果你想启用HTTP请求，添加到你的info.plist:
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
其他回答
Android用户:
Replace localhosts to a Lan IP addresses because when you run the project on an Android device, localhost is pointing to the Android device, instead of your computer, example: change http://localost to http://192.168.1.123 If your request URL is HTTPS and your Android device is under a proxy, assume you have installed User-added CA(like burp suite's CA or Charles's CA) in your Android device, make sure your Android version is below Nougat(7.0), because: Changes to Trusted Certificate Authorities in Android Nougat User-added CAs Protection of all application data is a key goal of the Android application sandbox. Android Nougat changes how applications interact with user- and admin-supplied CAs. By default, apps that target API level 24 will—by design—not honor such CAs unless the app explicitly opts in. This safe-by-default setting reduces application attack surface and encourages consistent handling of network and file-based application data.
解决方案很简单，更新nodejs版本14或更高
这对我有用，android使用一个特殊类型的IP地址10.0.2.2然后端口号
import { Platform } from 'react-native';
export const baseUrl = Platform.OS === 'android' ?
'http://10.0.2.2:3000/'
:
'http://localhost:3000/';
对于fetch API，你应该在.then中处理错误情况。
例如:
fetch(authURl,{ method: 'GET'})
.then((response) => {
const statusCode = response.status;
console.warn('status Code',statusCode);
if(statusCode==200){
//success code
}else{
//handle other error code
}
},(err) => {
console.warn('error',err)
})
.catch((error) => {
console.error(error);
return error;
});
只是你有Fetch....的变化
fetch('http://facebook.github.io/react-native/movies.json')
.then((response) => response.json())
.then((responseJson) => {
/*return responseJson.movies; */
alert("result:"+JSON.stringify(responseJson))
this.setState({
dataSource:this.state.dataSource.cloneWithRows(responseJson)
})
}).catch((error) => {
console.error(error);
});
