add cache headers.

image.go

@@ -32,6 +32,8 @@ func generate(w http.ResponseWriter, r *http.Request) {
 	}
 
 	w.Header().Set("Content-Type", "image/png")
+	w.Header().Set("Cache-Control", "max-age=604800")
+
 	if err := png.Encode(w, img); err != nil {
 		log.Printf("error encoding image: %s", err)
 		http.Error(w, "error encoding image!", 500)

proxy.go

@@ -9,6 +9,7 @@ import (
 
 func proxy(w http.ResponseWriter, r *http.Request) {
 	fmt.Println(r.URL.Path, ":~", r.Header.Get("user-agent"))
+	w.Header().Set("Cache-Control", "max-age=604800")
 
 	src := r.URL.Query().Get("src")
 	urlParsed, err := url.Parse(src)

render.go

@@ -21,6 +21,7 @@ var tmpl = template.Must(template.New("event").Parse(eventHTML))
 func render(w http.ResponseWriter, r *http.Request) {
 	fmt.Println(r.URL.Path, ":~", r.Header.Get("user-agent"))
 	w.Header().Set("Content-Type", "text/html")
+	w.Header().Set("Cache-Control", "max-age=604800")
 
 	code := r.URL.Path[1:]
 	if strings.HasPrefix(code, "e/") {