Connecting to websocket issue

[Jake]

I have been able to connect to many similar websockets using this same set up.

here is the domain wss://api.hitbtc.com/api/2/ws

For some reason this one will not connect. I have gotten the domain to respond in wscat, so I'm sure it's a valid request. 

Here is what I've tried:

1. Simple connect 

r::(`$":ws://api.hitbtc.com")"GET /api/2/ws HTTP/1.1\r\nHost: api.hitbtc.com\r\n\r\n";
show r

result: 

'.z.ws undefined
  [0]  show r

2. Using this library: https://github.com/jonathonmcmurray/ws.q

\l ws.q
.hbc.upd:{.hbc.x,:enlist x}
.hbc.h:.ws.open["ws://api.hitbtc.com/api/2/ws";`.hbc.upd]

result: 

q).hbc.h
0Ni

showing there is no connection where there should be... and here, 

q).ws.w
h| hostname       callback
-| -----------------------
 | api.hitbtc.com .hbc.upd

it shows nothing in the h column, which means there is no connection.

Any help would be greatly appreciated! Thanks in advance. 

[Flying]

For wss, you'll need SSL. Plain ws will not work.

I'd recommend a recent white paper that explains the whole process of wrestling with websockets in q quite well: https://code.kx.com/q/wp/websockets/

[Jonathon McMurray]

So there was a bug in my ws.q library – I didn’t realise that kdb+ already adds a number of WebSocket-related headers to requests to ws:// or wss:// URLs; my library added some of these headers as well, which caused problems on some hosts (I guess any I’d tried before just ignored duplicated headers)

 

I have updated the library so that it now works with the hitbtc example:

 

q).hbc.upd:{show .j.k x};

q).hbc.h:.ws.open["wss://api.hitbtc.com/api/2/ws";`.hbc.upd]

q).hbc.h .j.j `method`params`id!(`getCurrency;(1#`currency)!1#`ETH;123)

q)jsonrpc| "2.0"

result | `id`fullName`crypto`payinEnabled`payinPaymentId`payinConfirmations`payoutEnabled`payoutIsPaymentId`transferEnabled`delisted`payoutFee!("ETH";"Ethereum";1b;1b;0b;2f;1b;0b;1b;0b;"0.00958")

id     | 123f

 

GitHub issue: https://github.com/jonathonmcmurray/ws.q/issues/1

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