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package main
import (
"flag"
"log"
"net/http"
"net/http/httputil"
"net/url"
"strings"
)
func main() {
addr := flag.String("addr", ":3040", "Address to listen for HTTP traffic.")
trim := flag.Bool("trim", false, "Trim matching URL path before forwarding request.")
flag.Parse()
log.SetFlags(log.Lshortfile)
mux := http.NewServeMux()
for _, route := range flag.Args() {
parts := strings.SplitN(route, "=", 2)
if len(parts) == 1 {
parts = []string{"/", parts[0]}
}
var rr RR
hosts := strings.Split(parts[1], ",")
for _, host := range hosts {
u, err := url.Parse(host)
if err != nil {
log.Fatalf("ERROR: parse %s: %v", host, err)
}
rr.h = append(rr.h, httputil.NewSingleHostReverseProxy(u))
}
h := http.Handler(&rr)
if *trim {
h = http.StripPrefix(parts[0], h)
}
mux.Handle(parts[0], h)
log.Printf("Registered: %s -> %s", parts[0], parts[1])
}
log.Println("Listening:", *addr)
err := http.ListenAndServe(*addr, mux)
if err != nil {
log.Println("ERROR: serve:", err)
}
}
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