Test SSE Route from Julia, subscribe to SSE route until timeout

test.jl

using HTTP

# Developed against https://github.com/sitepoint-editors/server-sent-events-demo
# url="http://localhost:8080/sse"
function test_sse_channel(url="http://localhost:8080/sse", headers=[]; timeout=5)
    # Read from the stream until the timeout occurs
    # Note that timeout begins after the connection is started

    # Based on the audio streaming example here
    # https://github.com/JuliaWeb/HTTP.jl/blob/0464e7a3614e88ca09b17fa616fbd1b06237534a/src/HTTP.jl#L298
    try
        HTTP.open("GET", url, headers; retries=0, retry=false) do io
            r = startread(io)
            @show r.status
            t = Timer(timeout)
            while !eof(io) && isopen(t)
                bytes = readavailable(io)
                @show String(bytes)
            end
            close(io.stream)
            return r
        end
    catch e
        if !(isa(e, HTTP.IOExtras.IOError) && e.e == EOFError())
            # Note that later versions of HTTP.jl probably don't need the filter in the if statement above
            # https://github.com/JuliaWeb/HTTP.jl/blob/master/src/StreamRequest.jl#L89
            showerror(e, catch_backtrace())
            println(stderr, "")
        end
    end
end