I write a server with Webskers on Golang. Pressed a simple test script:

package main
Import (
  "FMT"
  "IO"
  "Log"
  "NET"
  "github.com/gobwas/ws"
)
Func Handleconn (Conn net.conn) {
  for {
    Header, ERR: = WS.ReadHeader (Conn)
    IF ERR! = nil {
      log.fatal (ERR)
    }
    BUF: = MAKE ([] byte, Header.Length)
    _, er = io.Readfull (Conn, BUF)
    IF ERR! = nil {
      log.fatal (ERR)
    }
    FMT.PrintLN (BUF)
    FMT.PrintLN (String (BUF))
  }
}
FUNC MAIN () {
  LN, ERR: = NET.LISTEN ("TCP", "Localhost: 8080")
  IF ERR! = nil {
    log.fatal (ERR)
  }
  for {
    Conn, Err: = ln.accept ()
    IF ERR! = nil {
      log.fatal (ERR)
    }
    _, ERR = WS.Upgrade (Conn)
    IF ERR! = nil {
      log.fatal (ERR)
    }
    Go Handleconn (Conn)
  }
}

I do a browser console:

Let Socket = New WebSocket ("WS: //127.0.0.1: 8080")
Socket.send ("Hello World")

and in the terminal I have some randomy bytes. Each time Socket.send ("Hello World") is different. What is it and why do they change with every shipment? Where does he take these bytes? The number of bytes always corresponds to the number of characters in the string, i.e. He reads what it is necessary. Did as in the documentation

Answer 1, Authority 100%

data come encrypted, you need to decrypt them.

Func Handleconn (Conn net.conn) {
  for {
    // Primea Sima
    // WS.ReadHeader (Conn)
    // MSG, _, ERR: = WSUTIL.ReadClientData (Conn)
    // IF ERR! = nil {
    // Panic (ERR)
    //}
    //
    // FMT.PrintLN (MSG)
    // FMT.PrintLN (String (MSG))
    // Example a little complicated
    Header, ERR: = WS.ReadHeader (Conn)
    IF ERR! = nil {
      log.fatal (ERR)
    }
    BUF: = MAKE ([] byte, Header.Length)
    _, er = io.Readfull (Conn, BUF)
    IF ERR! = nil {
      log.fatal (ERR)
    }
    // That was added
    IF Header.masked {
      WS.cipher (BUF, Header.mask, 0)
    }
    FMT.PrintLN (BUF)
    FMT.PrintLN (String (BUF))
  }
}