I've followed your How-To guide using the config-local-sample.json configuration file. The grid boots up correctly, and the selenium jar is able to register a node; however, client never receives any session id from the grid when submitting the following POST.

curl -X POST http://127.0.0.1:4444/wd/hub/session -d '{"desiredCapabilities":{"browserName": "firefox"}}'

Instead the grid crashes with the following output

time="2019-05-01T21:14:31Z" level=error msg="Panic: net/http: abort Handler\ngoroutine 50 [running]:\nruntime/debug.Stack(0xc000531758, 0x12fe800, 0xc000030d10)\n\t/usr/local/go/src/runtime/debug/stack.go:24 +0xa7\ngithub.com/qa-dev/jsonwire-grid/middleware.(*Wrap).Do.func1.1(0xc0003e8940)\n\t/go/src/github.com/qa-dev/jsonwire-grid/middleware/wrap.go:32 +0x60\npanic(0x12fe800, 0xc000030d10)\n\t/usr/local/go/src/runtime/panic.go:513 +0x1b9\nnet/http/httputil.(*ReverseProxy).ServeHTTP(0xc00011a230, 0x1611a00, 0xc000172c30, 0xc0001c0100)\n\t/usr/local/go/src/net/http/httputil/reverseproxy.go:284 +0x1058\ngithub.com/qa-dev/jsonwire-grid/handlers.(*CreateSession).tryCreateSession(0xc0003e89c0, 0xc0001c0100, 0xc000345bb8, 0x13, 0xc0001f4088, 0x1)\n\t/go/src/github.com/qa-dev/jsonwire-grid/handlers/createSession.go:92 +0x396\ngithub.com/qa-dev/jsonwire-grid/handlers.(*CreateSession).ServeHTTP(0xc0003e89c0, 0x1617940, 0xc000240000, 0xc0001c0100)\n\t/go/src/github.com/qa-dev/jsonwire-grid/handlers/createSession.go:60 +0x3e1\ngithub.com/qa-dev/jsonwire-grid/middleware.(*Wrap).Do.func1(0x1617940, 0xc000240000, 0xc0001c0100)\n\t/go/src/github.com/qa-dev/jsonwire-grid/middleware/wrap.go:36 +0x8a\nnet/http.HandlerFunc.ServeHTTP(0xc0003e89e0, 0x1617940, 0xc000240000, 0xc0001c0100)\n\t/usr/local/go/src/net/http/server.go:1964 +0x44\nnet/http.(*ServeMux).ServeHTTP(0x21a2760, 0x1617940, 0xc000240000, 0xc0001c0100)\n\t/usr/local/go/src/net/http/server.go:2361 +0x127\nnet/http.serverHandler.ServeHTTP(0xc00049fa00, 0x1617940, 0xc000240000, 0xc0001c0100)\n\t/usr/local/go/src/net/http/server.go:2741 +0xab\nnet/http.(*conn).serve(0xc0002f0dc0, 0x1618d80, 0xc000072140)\n\t/usr/local/go/src/net/http/server.go:1847 +0x646\ncreated by net/http.(*Server).Serve\n\t/usr/local/go/src/net/http/server.go:2851 +0x2f5\n" component=middlewareWrap

I'm eager to use your application, but I'm unfamiliar with go, so I'm unable to help fix this error. Can you please look into this error?

Note:
I used the Dockerfile provided with the repository to install/run jsonwire-grid

Thanks