HTTP to WS proxy

Minimal proxy available as package or as binary.

Usecase

I quickly created it to solve my problem - I needed to connect to Binance BSC blockchain testnet node through websocket (because app I was contributing to supported only websocket providers). But testnet node did not supported websocket - so I created this little script.

And I am sure I am recreating a wheel here - probably it was already implemented many times by other projects...

Package Usage

cmd/main.go and proxy_test.go also consume code as package so you can refer to those as examples as well.

p := http2ws.Proxy{
  TargetOpts: http2ws.TargetOpts{
    Method: "POST",
    URL:    "http://some-http-serv",
    Headers: map[string]string{
      "Content-Type": "application/json",
    },
  },
  Log: log.Default(),
  WSUpgrader: websocket.Upgrader{
    // allow all origins
    CheckOrigin: func(r *http.Request) bool { return true },
  },
  HTTPClient: http.Client{
    Timeout: time.Second,
  },
}

http.ListenAndServe(args.addr, &p)

Executable Usage

Print help

http2ws --help

Forward incoming websocket messages to target-url as HTTP POST requests with adding header Content-Type:application/json (multiple headers can be specified, see help)

http2ws \
  -addr=:4000 \
  -target-url="http://some-http-serv" \
  -target-method=POST \
  -target-headers="Content-Type:application/json"