Cannot connect to rippled WebSocket API using Dart client.

[gmosx]

rippled.cfg:
...
[websocket_ip]
127.0.0.1

[websocket_port]
6006
...

$ ./rippled --net

Dart code:

WebSocket.connect('ws://127.0.0.1:6006').then((WebSocket socket) {
print('Connected');
socket.listen((message) {
print(message);
},
onDone: () {
});
socket.send('{"command":"subscribe","id":0,"streams":["server", "ledger", "transactions"]}');
});

Expected:

Dart should start receiving streaming data.

Actual:

print('Connected') is not called. Interestingly if I shutdown rippled while keeping the Dart client running I get:

Uncaught Error: HttpParserException: Connection closed before full header was received
Unhandled exception:
HttpParserException: Connection closed before full header was received
#0 _FutureImpl._scheduleUnhandledError. (dart:async:349:9)
#1 Timer.run. (dart:async:2251:21)
#2 Timer.run. (dart:async:2258:13)
#3 Timer.Timer. (dart:async-patch:9:15)
#4 _Timer._createTimerHandler._handleTimeout (dart:io:5987:28)
#5 _Timer._createTimerHandler._handleTimeout (dart:io:5995:7)
#6 _Timer._createTimerHandler. (dart:io:6003:23)
#7 _ReceivePortImpl._handleMessage (dart:isolate-patch:40:92)

[JoelKatz]

There were a few minor issues with how we check for the end of the HTTP headers that were causing this error. Those are fixed with commit e310b49.

Next, websocketpp wouldn't accept an "upgrade" header, which is what Dart sends. It insists on "Upgrade". That is also fixed with the same commit.

However, we're still dead in the water because of this issue:
zaphoyd/websocketpp#101

"Short Key 3: A0 A3 7F 46 8E 7F bytes missing: 8 eofbit: true failbit: true badbit: false goodbit: false
Full Key3 not found in first chop"

Possible solutions include:

1. Finding a websocket library for Dart that's less unusual.
2. Getting the parsing issues in websocketpp fixed.
3. Switching Rippled to a different websocket library. (We have a long history of being not too please with this one.)

[gmosx]

1. Finding a websocket library for Dart that's less unusual.

Since this library is included in the SDK, it's highly unlikely that anyone will come up with an alternative.

[JoelKatz]

Fixed with commit 986cce6
The remaining issue was other headers that were also not found by websocketpp because of case differences.