Summary:
This is **a critical issue**.
The issue arises when incremental networking is enabled from JS by setting `onprogress` or `onload` on an `XMLHttpRequest` object.
The results:
Unicode characters get corrupted seemingly in random. The issue is from the way Unicode character parsing is handled in `RCTNetworking.mm`. When incremental networking is enabled, each chunk of data is decoded and passed to JS:
```objective-c
incrementalDataBlock = ^(NSData *data, int64_t progress, int64_t total) {
NSString *responseString = [RCTNetworking decodeTextData:data fromResponse:task.response];
if (!responseString) {
RCTLogWarn(@"Received data was not a string, or was not a recognised encoding.");
return;
}
NSArray<id> *responseJSON = @[task.requestID, responseString, @(prog
Closes https://github.com/facebook/react-native/pull/10110
Reviewed By: yungsters
Differential Revision: D4101533
Pulled By: fkgozali
fbshipit-source-id: 2674eaf0dd4568889070c6cde5cdf12edc5be521
Pieter De Baets
Leo Natan
