XHR fails with "Invalid response for blob" on Android

• [x ] I have reviewed the documentation
• [x ] I have searched existing issues
• [x ] I am using the latest React Native version

React crash on fetch, Android only Similar to https://github.com/facebook/react-native/issues/18223 (but this is only ios) Similar to https://github.com/facebook/react-native/issues/18190 (but my response is not empty and the response code is 200)

Environment

Environment: OS: macOS High Sierra 10.13.3 Node: 9.6.1 Yarn: 1.5.0 npm: 5.6.0 Watchman: 4.9.0 Xcode: Xcode 9.2 Build version 9C40b Android Studio: 3.0 AI-171.4443003

Packages: (wanted => installed) react: 16.2.0 => 16.2.0 react-native: 0.54.0 => 0.54.0

Steps to Reproduce

that’s enough to crash on Android (it works all right on ios) Emulated on google Pixel android 27

fetch(https://crypto-viewer.rebeleo.com/updates/en-US/android) .then(res => res.json()) .then(data => ({ data })) .catch(err => { alert('Something went wrong with the Updatesfeed 😦 => ’ + err) return { err } })

Expected Behavior

Expect the type of the response to be seen as json

Actual Behavior

This is a regression issue. The response is seen as empty, and as blob

// Is going in this branch case ‘blob’: if (typeof this._response === ‘object’ && this._response) { this._cachedResponse = BlobManager.createFromOptions(this._response); } else { throw new Error(Invalid response for blob: ${this._response}); } break;

[satya164]

@tmaly1980: Why is this still a problem when there’s a clear solution?

Because nobody has provided a way to reproduce this bug and there’s no way to test whatever fix we do actually works.

[TheSavior]

@satya164

Here is a repro:

https://github.com/TheSavior/react-native-blob-repro

The relevant lines are the server:

app.post('/', (req, res) => res.end('', 'binary'));

and the react-native app:

fetch('http://localhost:8798', {method: 'POST'});