XMLHttpRequest progress event has event.total, but event.loaded is always 0

[butchmarshall]

I was running RN 0.42 and saw this. I then upgraded to 0.46.4 and am still encountering the same results. My device is running Android 7.

The XMLHttpRequest object fires progress events, but returns 0 bytes loaded until completed.

var xhr = new XMLHttpRequest();
xhr.open("GET", "/my/api/with/content-length", true);

xhr.addEventListener('progress', function(event) {
	if (event.lengthComputable) {
		console.log(event.loaded, event.total);
	}
}, false);

xhr.send()

My console shows lots of progress events and the request completes successfully, but loaded is always 0

10-14 21:41:59.138 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.139 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.140 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.141 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.142 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.143 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.143 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.144 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.145 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.146 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.147 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.148 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.149 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.150 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.150 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.151 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.152 17907 19666 I ReactNativeJS: 0, 4183950
10-14 21:41:59.153 17907 19666 I ReactNativeJS: 0, 4183950

Using Chrome the same code/endpoint successfully reports the loaded progress.

[react-native-bot]

@facebook-github-bot no-template

[facebook-github-bot]

Hey, thanks for reporting this issue! It looks like your description is missing some necessary information, or the list of reproduction steps is not complete. Can you please add all the details specified in the Issue Template? This is necessary for people to be able to understand and reproduce the issue being reported. I am going to close this, but feel free to open a new issue with the additional information provided. Thanks! See "What to Expect from Maintainers" to learn more.

[dolo098]

I'm having this issue also, any updates on this?

[butchmarshall]

Yes, I fixed it and issued a pull request here.

I don't have any idea how to push the pull requests merge forward, however...