Created
November 5, 2018 17:06
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pre-Go1.12 websocket hijack+proxy
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httpsServer := &http.Server{ | |
Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | |
hj, isHJ := w.(http.Hijacker) | |
if r.Header.Get("Upgrade") == "websocket" && isHJ { | |
c, br, err := hj.Hijack() | |
if err != nil { | |
log.Printf("websocket websocket hijack: %v", err) | |
http.Error(w, err.Error(), 500) | |
return | |
} | |
defer c.Close() | |
var be net.Conn | |
if len(hostPorts) == 0 { | |
backendHostPort := base.Host | |
if !strings.Contains(backendHostPort, ":") { | |
backendHostPort = net.JoinHostPort(backendHostPort, "443") | |
} | |
be, err = tls.DialWithDialer(dialer, "tcp", backendHostPort, tlsConfig) | |
} else { | |
for _, hostPort := range hostPorts { | |
be, err = tls.DialWithDialer(dialer, "tcp", hostPort, tlsConfig) | |
if err == nil { | |
break | |
} | |
} | |
} | |
if err != nil { | |
log.Printf("websocket Dial: %v", err) | |
http.Error(w, err.Error(), 500) | |
return | |
} | |
defer be.Close() | |
if err := r.Write(be); err != nil { | |
log.Printf("websocket backend write request: %v", err) | |
http.Error(w, err.Error(), 500) | |
return | |
} | |
errc := make(chan error, 1) | |
go func() { | |
n, err := io.Copy(be, br) // backend <- buffered reader | |
if err != nil { | |
err = fmt.Errorf("websocket: to copy backend from buffered reader: %v, %v", n, err) | |
} | |
errc <- err | |
}() | |
go func() { | |
n, err := io.Copy(c, be) // raw conn <- backend | |
if err != nil { | |
err = fmt.Errorf("websocket: to raw conn from backend: %v, %v", n, err) | |
} | |
errc <- err | |
}() | |
if err := <-errc; err != nil { | |
log.Print(err) | |
} | |
return | |
} | |
rp.ServeHTTP(w, r) | |
}), | |
TLSConfig: &tls.Config{ | |
NextProtos: []string{"h2", "http/1.1"}, | |
GetCertificate: autoCertMan.GetCertificate, | |
}, | |
} |
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@bubbajoe this may or may not be relevant - I believe this functionality is now in Go 1.12
https://golang.org/doc/go1.12#net/http/httputil