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Multiple host reverse proxy in Go
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package main | |
import ( | |
"log" | |
"net/http" | |
"net/http/httputil" | |
"net/url" | |
) | |
var ( | |
hostTarget = map[string]string{ | |
"app1.domain.com": "http://192.168.1.2/owncloud", | |
"app2.domain.com": "http://192.168.1.2:8080", | |
"app3.domain.com": "http://192.168.1.2:8888", | |
} | |
hostProxy map[string]*httputil.ReverseProxy | |
) | |
type baseHandle struct{} | |
func (h *baseHandle) ServeHTTP(w http.ResponseWriter, r *http.Request) { | |
host := r.Host | |
if fn, ok := hostProxy[host]; ok { | |
fn.ServeHTTP(w, r) | |
return | |
} | |
if target, ok := hostTarget[host]; ok { | |
remoteUrl, err := url.Parse(target) | |
if err != nil { | |
log.Println("target parse fail:", err) | |
return | |
} | |
proxy := httputil.NewSingleHostReverseProxy(remoteUrl) | |
hostProxy[host] = proxy | |
proxy.ServeHTTP(w, r) | |
return | |
} | |
w.Write([]byte("403: Host forbidden " + host)) | |
} | |
func main() { | |
h := &baseHandle{} | |
http.Handle("/", h) | |
server := &http.Server{ | |
Addr: ":8082", | |
Handler: h, | |
} | |
log.Fatal(server.ListenAndServe()) | |
} |
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