added simple code

Author: orkunkaraduman

demo/simple/.gitignore

@@ -0,0 +1 @@
+/simple

demo/simple/main.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"log"
+	"net/http"
+
+	"github.com/go-httpproxy/httpproxy"
+)
+
+func OnError(ctx *httpproxy.Context, where string,
+	err *httpproxy.Error, opErr error) {
+	// Log errors.
+	log.Printf("ERR: %s: %s [%s]", where, err, opErr)
+}
+
+func OnAccept(ctx *httpproxy.Context, w http.ResponseWriter,
+	r *http.Request) bool {
+	// Handle local request has path "/info"
+	if r.Method == "GET" && !r.URL.IsAbs() && r.URL.Path == "/info" {
+		w.Write([]byte("This is go-httpproxy."))
+		return true
+	}
+	return false
+}
+
+func OnAuth(ctx *httpproxy.Context, authType string, user string, pass string) bool {
+	// Auth test user.
+	if user == "test" && pass == "1234" {
+		return true
+	}
+	return false
+}
+
+func OnConnect(ctx *httpproxy.Context, host string) (
+	ConnectAction httpproxy.ConnectAction, newHost string) {
+	// Apply "Man in the Middle" to all ssl connections. Never change host.
+	return httpproxy.ConnectMitm, host
+}
+
+func OnRequest(ctx *httpproxy.Context, req *http.Request) (
+	resp *http.Response) {
+	// Log proxying requests.
+	log.Printf("INFO: Proxy: %s %s", req.Method, req.URL.String())
+	return
+}
+
+func OnResponse(ctx *httpproxy.Context, req *http.Request,
+	resp *http.Response) {
+	// Add header "Via: go-httpproxy".
+	resp.Header.Add("Via", "go-httpproxy")
+}
+
+func main() {
+	// Create a new proxy with default certificate pair.
+	prx, _ := httpproxy.NewProxy()
+
+	// Set handlers.
+	prx.OnError = OnError
+	prx.OnAccept = OnAccept
+	prx.OnAuth = OnAuth
+	prx.OnConnect = OnConnect
+	prx.OnRequest = OnRequest
+	prx.OnResponse = OnResponse
+
+	// Listen...
+	http.ListenAndServe(":8080", prx)
+}