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main.go
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main.go
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package main
import (
"flag"
"log"
"net"
"net/http"
"net/http/httputil"
"net/url"
"time"
)
var (
addr string
target string
)
func init() {
flag.StringVar(&addr, "addr", ":8080", "server address, eg: 127.0.0.1:8080")
flag.StringVar(&target, "target", "http://127.0.0.1:8000", "proxy target, eg: http://127.0.0.1:8000")
}
func newProxy(targetHost string) (*httputil.ReverseProxy, error) {
url, err := url.Parse(targetHost)
if err != nil {
return nil, err
}
rp, err := httputil.NewSingleHostReverseProxy(url), nil
if err != nil {
return nil, err
}
rp.Transport = &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 200 * time.Millisecond,
KeepAlive: 30 * time.Second,
}).DialContext,
MaxIdleConns: 1000,
MaxIdleConnsPerHost: 100,
MaxConnsPerHost: 100,
DisableCompression: true,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
}
return rp, nil
}
func proxyRequestHandler(proxy *httputil.ReverseProxy) func(http.ResponseWriter, *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
proxy.ServeHTTP(w, r)
}
}
func main() {
flag.Parse()
proxy, err := newProxy(target)
if err != nil {
panic(err)
}
http.HandleFunc("/", proxyRequestHandler(proxy))
log.Println("server listening on:", addr)
log.Fatal(http.ListenAndServe(addr, nil))
}