Issue with connecting to RPC over websockets.

[ImmanuelSegol]

software versions:
node v8.12.0
btcd v0.12.0-beta

I have been experiencing wired behavior when attempting to connect to the BTCD JSON-RPC over a web socket connection on Windows machine (on my Linux machine everything worked fine).

I would constantly get this error from btcd:
HTTP: TLS handshake error from 127.0.0.1:50198: tls: first record does not look like a TLS handshake

And Walli-server would display: error: could not connect to BTCD: "Parse Error"

I attempted to connect useing the rpc.cert and rpc.key:
const ws = new WebSocket('wss://127.0.0.1:18334/ws', { headers: { 'Authorization': 'Basic '+new Buffer(${'user'}:${'user'}).toString('base64') }, key:key, cert: cert, ca: [cert] });

Only to recive the following errors
btcd error: TLS handshake error from 127.0.0.1:50315: read tcp4 127.0.0.1:18334->127.0.0.1:50315: wsarecv: An existing connection was forcibly closed by the remote host.
node error:ERROR:Error: write EPROTO 101057795:error:1414D17A:SSL routines:tls12_check_peer_sigalg:wrong curve:openssl\ssl\t1_lib.c:1097:

After further investigation I found out that there is a EPROTO error on node 8 and above:
#19359
#16196

I installed Node 10 and everything worked great I didn't test with other versions.
But I think we should implement connecting to the RPC with the rpc.cert file.