Allow passing http-client config options to client function

[dmarjenburgh]

I'm specifically interested in passing proxy-host and proxy-port, but in general it'd be nice if you could pass your own config into the http-client.

For example, like this:

(require '[cognitect.aws.client.api :as aws])
(aws/client {:api :s3
             :http-client-config {:proxy-host "10.0.30.40"
                                  :proxy-port 9400}})

[dchelimsky]

:endpoint-override map added in 0.8.280. You can supply :protocol, :hostname, :port, and :path.

[borgesgabriel]

I'm not sure that this issue has been fully addressed.

Referring back to @dmarjenburgh's ask, proxy-host and proxy-port create a org.eclipse.jetty.client.Socks4Proxy, and cannot be specified in :endpoint-override as far as I can tell.

[gzmask]

I agree with @borgesgabriel . This is not the same thing.

[xiongtx]

See #181 (comment).