TypeError: Network request failed On Android
Problem
Hi Everyone, I found this problem on my React-Native Android App. When I using a fetch to communicate with a working api, this type of error is returned to me. > TypeError: Network request failed I Used the Chrome debbuger and I found this: `TypeError: Network request failed at XMLHttpRequest.xhr.onerror (whatwg-fetch.js:504) at XMLHttpRequest.dispatchEvent (event-target.js:172) at XMLHttpRequest.setReadyState (XMLHttpRequest.js:580) at XMLHttpRequest.__didCompleteResponse (XMLHttpRequest.js:394) at XMLHttpRequest.js:507 at RCTDeviceEventEmitter.emit (EventEmitter.js:181) at MessageQueue.__callFunction (MessageQueue.js:366) at MessageQueue.js:106 at MessageQueue.__guard (MessageQueue.js:314) at MessageQueue.callFunctionReturnFlushedQueue (MessageQueue.js:105)` This is the code that I used: `static creaUtente(identity, FirstName, LastName, FiscalCode , Email) { let formdata = new FormData(); formdata.append('Identity', identity); formdata.append('FirstName', FirstName); formdata.append('LastName', LastName); formdata.append('FiscalCode', FiscalCode); formdata.append('Email', Email); console.log(Configuration.base_url.rest + Configuration.apiRoutes.signUp) console.log(formdata) return new Promise((resolve, reject)=> { fetch('https://linktotheapi.com',{ method: 'POST', headers: { 'Content-Type': 'multipart/form-data', },
Error Output
error is returned to me.
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1 Fix
Fix Network Request Failed Error in React-Native Android App
The error 'TypeError: Network request failed' typically occurs due to issues with the network request configuration, such as incorrect headers, network connectivity issues, or CORS problems. In this case, the 'Content-Type' header is set to 'multipart/form-data', which is not correctly handled by the fetch API in React Native. Instead, the fetch API automatically sets the correct 'Content-Type' when FormData is used, leading to potential network request failures.
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- 1
Remove Content-Type Header
Remove the 'Content-Type' header from the fetch request. When using FormData, the fetch API will automatically set the correct headers.
javascriptreturn fetch('https://linktotheapi.com', { method: 'POST', body: formdata, }); - 2
Check Network Connectivity
Ensure that the device has an active internet connection. You can use the NetInfo library to check the network status before making the request.
javascriptimport NetInfo from '@react-native-community/netinfo'; NetInfo.fetch().then(state => { if (!state.isConnected) { console.log('No internet connection'); } }); - 3
Verify API URL
Double-check the API endpoint URL to ensure it is correct and accessible. You can test the URL in a browser or a tool like Postman.
javascriptconsole.log(Configuration.base_url.rest + Configuration.apiRoutes.signUp); - 4
Handle CORS Issues
If the API is hosted on a different domain, ensure that CORS is properly configured on the server to allow requests from your app's origin.
javascript// Check server-side CORS configuration - 5
Debug with Console Logs
Add console logs before and after the fetch call to see if the request is being made and to log any errors returned from the API.
javascriptconsole.log('Making API request...'); fetch(...).catch(error => console.error('Fetch error:', error));
Validation
To confirm the fix worked, test the application on an Android device or emulator. Ensure that the network request completes successfully without throwing the 'TypeError: Network request failed' error. Check the console logs for any errors or successful responses.
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Environment
Submitted by
Alex Chen
2450 rep