adding requestHeaders to the websocket client

[manute]

Adding requestHeaders argument to the websocket client funcs to have the possibilty of passing request Headers .

For example, if you need to pass other authorization header like X-Auth-Token or/and other headers like Sec-WebSocket-Key , Sec-WebSocket-Versionthis PR opens that possibility.

Example:

client.Websocket(query, http.Header{
     "X-Auth-Token": {"validToken"},
     "Sec-WebSocket-Key": {"SGVsbG8sIHdvcmxkIQ=="},
     "Sec-WebSocket-Version": {13},
}

[coveralls]

Coverage remained the same at 61.817% when pulling 8106c2f on manute:master into 5c644a6 on 99designs:master.

[manute]

hmm the lint fails with

client/websocket.go:56:46: bodyclose: response body must be closed (bodyclose)
	c, resp, err := websocket.DefaultDialer.Dial(url, reqHeaders)

but that body is being closed inside the Subscriptions.Close func and I've not touched any code there 🤔 , any idea @vektah ?

[vektah]

hmm the lint fails with

try a rebase, I fixed a few of these ~0.9.2 ish.

[vektah]

PR message could use more explaining why this would be useful, and probably tests/docs on showing how it would be used.

[manute]

try a rebase, I fixed a few of these ~0.9.2 ish.

I did and the same results 😢

PR message could use more explaining

Added. Let me know if more doc or tests are needed , although the type added is pretty clear

[vektah]

Hmm yeah, it's not failing on master but something about your change is confusing the linter.

Lets just skip it, this is just the test client.

c, resp, err := websocket.DefaultDialer.Dial(url, reqHeaders) //nolint:bodyclose

[vektah]

Please a look at #861 and see if it covers your use case

[manute]

yeah I think with https://github.com/99designs/gqlgen/pull/861/files#diff-3c0b8ea9d09776a0db9bab04cf0a6ea7R32 it can be added the headers to the websocket requests.

I'll close the issue in lieu of that PR.
Thanks @vektah ,