I've been testing a simple React Native app heavily borrowed from the sample app, and ran into this problem only when I use network shared from my iPhone 4G/LTE hotspot. This won't be seen when connecting to a WiFi AP.
Here's the detailed error message:
Request.fetch.xhr.onload index.ios.bundle:11123
XMLHttpRequestBase.$XMLHttpRequestBase_sendLoad index.ios.bundle:11569
XMLHttpRequestBase.callback index.ios.bundle:11549
XMLHttpRequest.<anonymous> index.ios.bundle:11330
MessageQueueMixin._invokeCallback index.ios.bundle:7446
Object.ErrorUtils.applyWithGuard index.ios.bundle:873
guardReturn index.ios.bundle:7277
MessageQueueMixin.invokeCallbackAndReturnFlushedQueue index.ios.bundle:7459
messageHandlers.executeJSCall:method:arguments:callback: debugger-ui:54
WebSocket.ws.onmessage debugger-ui:80
I tried to look for the similar issue but without success. Tracing back to the corresponding fetch.js for the XmlHttpRequest function doesn't help me to know the issue much either. Could anyone have the similar experience and help?