diff --git a/main.go b/main.go
index dd941d0..69ca06e 100644
--- a/main.go
+++ b/main.go
@@ -3,6 +3,7 @@
 package main
 
 import (
+	"flag"
 	"fmt"
 	"log"
 	"net/http"
@@ -12,13 +13,22 @@ import (
 	"github.com/davidbyttow/govips/pkg/vips"
 )
 
+var (
+	imgServer  = flag.String("s", "https://images.example.com/", "URL prefix")
+	listenAddr = flag.Int("l", "0.0.0.0:8080", "Listen address")
+)
+
+func init() {
+	flag.Parse()
+}
+
 func main() {
 	// Start vips with the default configuration
 	vips.Startup(nil)
 	defer vips.Shutdown()
 
 	http.HandleFunc("/", resizeHandler)
-	log.Fatal(http.ListenAndServe("0.0.0.0:4444", nil))
+	log.Fatal(http.ListenAndServe(listenAddr, nil))
 }
 
 func resizeHandler(w http.ResponseWriter, r *http.Request) {
@@ -57,7 +67,7 @@ func resizeHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	// Start fetching the image from the given url
-	resp, err := http.Get(queryUrl)
+	resp, err := http.Get(imgServer + queryUrl)
 	if err != nil {
 		w.Write([]byte(fmt.Sprintf("failed to get %s: %v", queryUrl, err)))
 		w.WriteHeader(http.StatusBadRequest)