Add origin and host flags to the CLI

cli/httpcache.go

@@ -5,18 +5,24 @@ import (
 	"log"
 	"net/http"
 	"net/http/httputil"
+	"net/url"
 	"os"
+	"path"
+	"strings"
 
 	"github.com/lox/httpcache"
 	"github.com/lox/httpcache/httplog"
 )
 
 const (
+	defaultOrigin = "http://127.0.0.1:80"
 	defaultListen = "0.0.0.0:8080"
 	defaultDir    = "./cachedata"
 )
 
 var (
+	origin   string
+	host     string
 	listen   string
 	useDisk  bool
 	private  bool
@@ -26,6 +32,8 @@ var (
 )
 
 func init() {
+	flag.StringVar(&origin, "origin", defaultOrigin, "the origin url to proxy to")
+	flag.StringVar(&host, "host", "", "the host header to send")
 	flag.StringVar(&listen, "listen", defaultListen, "the host and port to bind to")
 	flag.StringVar(&dir, "dir", defaultDir, "the dir to store cache data in, implies -disk")
 	flag.BoolVar(&useDisk, "disk", false, "whether to store cache data to disk")
@@ -40,10 +48,23 @@ func init() {
 }
 
 func main() {
+	u, err := url.Parse(origin)
+	if err != nil {
+		log.Fatal(err)
+	}
+
 	proxy := &httputil.ReverseProxy{
 		Director: func(r *http.Request) {
-			r.URL.Scheme = "http"
-			r.URL.Host = "127.0.0.1:80"
+			r.URL.Scheme = u.Scheme
+			r.URL.Host = u.Host
+			if strings.HasSuffix(r.URL.Path, "/") {
+				r.URL.Path = path.Join(u.Path, r.URL.Path) + "/"
+			} else {
+				r.URL.Path = path.Join(u.Path, r.URL.Path)
+			}
+			if host != "" {
+				r.Host = host
+			}
 		},
 	}