Erroe: failed to write to incoming websocket: ConnectionClosed

Hi,

I'm having an issue with:
```
tunnelto 0.1.18
```

I'm trying to tunnel a wss connection however I'm getting an error. The same connection works with ngrock. The following are the two commands and the error logs:

```
ngrok http -region eu -hostname=### 172.28.1.3:8080
tunnelto --host 172.28.1.3 --subdomain ###--port 8080 -v
```

Logs:

```
101 GET /v1/graphql
DEBUG tunnelto::local > read from local service: ""
DEBUG tunnelto::introspect::console_log > no log line for response
INFO tunnelto > got end stream [StreamId([206, 121, 210, 111, 39, 161, 7, 18])]
DEBUG tunnelto > Processed packet: "END STREAM"
DEBUG tunnelto::local > read from local service: ""
DEBUG tunnelto::introspect::console_log > no log line for response
WARN tunnelto::local > closing stream
DEBUG tunnelto::local > read from local service: ""
DEBUG tunnelto::introspect::console_log > no log line for response
WARN tunnelto::local > closing stream
ERROR tunnelto::introspect > failed to write to incoming websocket: ConnectionClosed
INFO tunnelto::local > done reading from client stream
ERROR tunnelto::introspect > failed to write to incoming websocket: ConnectionClosed
INFO tunnelto::local > done reading from client stream
ERROR tunnelto::introspect > failed to write to incoming websocket: ConnectionClosed
INFO tunnelto::local > done reading from client stream
ERROR tunnelto::introspect > failed to write to incoming websocket: ConnectionClosed
INFO tunnelto::local > done reading from client stream
DEBUG tunnelto::local > read from local service: ""
DEBUG tunnelto::introspect::console_log > no log line for response
WARN tunnelto::local > closing stream
ERROR tunnelto::introspect > failed to write to incoming websocket: ConnectionClosed
INFO tunnelto::local > done reading from client stream
ERROR tunnelto::introspect > failed to write to incoming websocket: ConnectionClosed
INFO tunnelto::local > done reading from client stream
INFO tunnelto > stream["stream_iB4XD1s61LE"] -> init
DEBUG tunnelto > Processed packet: "INIT STREAM"
INFO tunnelto > stream["stream_iB4XD1s61LE"] -> new data: 991
INFO tunnelto::local > setting up local stream: stream_iB4XD1s61LE
INFO tunnelto > forwarded to local tcp (stream_iB4XD1s61LE)
DEBUG tunnelto > Processed packet: "STREAM DATA"
DEBUG tunnelto::local > wrote to local service: 991
DEBUG tunnelto::local > read from local service: "HTTP/1.1 101 Switching Protocols\r\nconnection: upgrade\r\nupgrade: websocket\r\nsec-websocket-accept: SKh2fziQyGpvgv3E0GZTAMiTZnI=\r\ndate: Fri, 04 Jun 2021 14:23:41 GMT\r\n\r\n"
```