UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.76 Safari/537.36

Steps to reproduce the problem:
1. Visit http://phoboslab.org/files/bugs/node-ws/
2. The 2nd line the textarea will read "Fail: data at 0 is 66 (received 4 bytes)"

What is the expected behavior?
2nd line in the textarea should read "Succes: all zeroes (received 16 bytes)"

What went wrong?
A WebSocket server sends out 3 message with raw bytes, all 0, using per message deflate. The messages vary in size (32768, 16, 32768 bytes). The 2nd message arrives as garbage.

The test case reliably fails in Chrome & Firefox but works without any problems in Edge and Safari. So I'm not really sure if this is an issue with the WebSocket server or browsers. Are Chrome & Firefox using the same libs for deflate?

Firefox 51 Windows & OSX: fail
Chrome 56 Windows & OSX: fail
Safari 10 OSX: success
Edge Windows: success

Chrome version: 56.0.2924.76  Channel: stable
OS Version: OS X 10.12.2
Flash Version: Shockwave Flash 24.0 r0