Set cache-control max-age for cloudfront

.gitignore

@@ -1,3 +1,4 @@
 build
 .goxc.local.json
 *.test
+imageproxy.iml

cmd/imageproxy/main.go

@@ -25,7 +25,7 @@ import (
 	"github.com/gregjones/httpcache"
 	"github.com/gregjones/httpcache/diskcache"
 	"github.com/peterbourgon/diskv"
-	"willnorris.com/go/imageproxy"
+	"github.com/almamedia/imageproxy"
 )
 
 // goxc values

imageproxy.go

@@ -125,6 +125,7 @@ func (p *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	copyHeader(w, resp, "Content-Length")
 	copyHeader(w, resp, "Content-Type")
+	w.Header().Set("Cache-Control", fmt.Sprintf("max-age=%d, public, must-revalidate, proxy-revalidate", 31557600))
 	io.Copy(w, resp.Body)
 }