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|
package main
import (
"fmt"
"io"
"strings"
"net"
"net/http"
"net/url"
log "github.com/sirupsen/logrus"
)
//type Endpoint struct {
// path string
// address string
//}
//
//
//func proxy(w http.ResponseWriter, req *http.Request, end Endpoint) {
//}
//
//func makeProxiedRequest(w http.ResponseWriter, req *http.Request, end Endpoint) {
//
//}
//
func main() {
const addr = "localhost:3333"
log.Info("configuring reverse proxy...")
origin, err := url.Parse("http://localhost:8000")
if err != nil {
log.Fatal(err)
}
log.Infof("listening on %v", addr)
http.ListenAndServe(addr, http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
req.Host = origin.Host
req.URL.Host = origin.Host
req.URL.Scheme = origin.Scheme
req.RequestURI = ""
// set X-Forwarded-For
forwardedFor, _, _ := net.SplitHostPort(req.RemoteAddr)
req.Header.Set("X-Forwarded-For", forwardedFor)
response, err := http.DefaultClient.Do(req)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "%v", err)
log.Fatal(err)
}
// copy header
for key, values := range response.Header {
for _, value := range values {
w.Header().Add(key, value)
}
}
// get trailer keys
trailerKeys := []string{}
for key := range response.Trailer {
trailerKeys = append(trailerKeys, key)
}
if (len(trailerKeys) > 0) {
w.Header().Set("Trailer", strings.Join(trailerKeys, ","))
}
w.WriteHeader(response.StatusCode)
// copy body
io.Copy(w, response.Body)
}))
}
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