Websocket integration

[quinnj]

It'd be nice to support websocket upgrade requests in an HTTP.Server, as well as have websocket client functionality as well.

cc: @sarvjeethghotra

[iblislin]

please checkout DandelionWebSockets and this PR as well:
dandeliondeathray/DandelionWebSockets.jl#5

[EricForgy]

I'm by no means an expert, but I'd love to see websockets integration. Any pointers how to get started? Maybe I could try to help.

Edit: I'm interested in seeing WSs integrated into the server.

[samoconnor]

I've implemented a simple WebSockets client as a way to get test coverage of Connection: Upgrade. Adding server support should be straight forward.

The API is like this...

HTTP.WebSockets.open("wss://echo.websocket.org") do io
        write(io, "Foo")
        @test !eof(io)
        @test String(readavailable(io)) == "Foo"

        write(io, Vector{UInt8}("Hello"))
        write(io, " There")
        write(io, " World", "!")
        closewrite(io)

        buf = IOBuffer()
        write(buf, io)
        @test String(take!(buf)) == "Hello There World!"

        close(io)
    end

https://github.com/samoconnor/HTTP.jl/blob/simplify_parser_branch/test/WebSockets.jl

[samoconnor]

This now supports client and server WebSockets: https://github.com/JuliaWeb/HTTP.jl/blob/master/src/WebSockets.jl

@EricForgy is also working on integreating HTTP.jl with the other WebSockets.jl package: https://github.com/JuliaWeb/WebSockets.jl/commits/change_dependencies

[samoconnor]

Websockets client and server is now implemented here and over at WebSockets.jl.
Please open a new issue if you encounter a problem.