I am having an issue with the react-native JS debugger on the iOS. The error occurs when I try to debug my app using the JS Debugger tool. I tried different solutions around the web with no success. Has anyone come across this error and managed to fix it?
Replication:
1) Run development app on real iOS device, which loads the JS bundle from http://172.16.23.27.xip.io:8081/index.delta?platform=ios&dev=true&minify=false
2) Enable JS Remote debug tools, which opens http://localhost:8081/debugger-ui/ in Chrome.
3) Bundle reloads, and Chrome DevTools console displays the following error:
Failed to load http://172.16.23.27.xip.io:8081/index.delta?platform=ios&dev=true&minify=false: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8081' is therefore not allowed access. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled. (index):188 Uncaught (in promise) TypeError: Failed to fetch
"react": "16.2.0",
"react-native": "0.52.1"
Just to add to this, if anyone is doing development on iOS then Android (or vice versa)..
If you get this message and it WAS working before; for example, I was working with an iOS project, then closed my Metro Bundler, opened cmd and built for Android. My debugger worked before with my Android project, but after this process I received the CORS issue.
Just close down the debugger tab in Chrome and open up again in the React-Native Dev Menu. Rebuild the project and hey presto! If you're in the situation where it did work, then this may the approach for you also.
Try to use
http://172.16.23.27.xip.io:8081/debugger-ui/
for debug.or
open
/node_modules/metro/src/Server\index.js
find
_processDeltaRequest
Install Allow-Control-Allow-Origin: * chrome extension. It adds CROS to response header.