http: add Expires header, with 5 minutes by default

Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>

2 files changed, 5 insertions, 0 deletions

diff --git a/pkg/app/serve.go b/pkg/app/serve.go
index a263781..4f97039 100644
--- a/pkg/app/serve.go
+++ b/pkg/app/serve.go
@@ -17,6 +17,7 @@ import (
 	"soko/pkg/app/handler/useflags"
 	"soko/pkg/config"
 	"soko/pkg/database"
+	"time"
 )
 
 // Serve is used to serve the web application
@@ -137,6 +138,7 @@ func mw(handler http.HandlerFunc) http.HandlerFunc {
 // setDefaultHeaders sets the default headers that apply for all pages
 func setDefaultHeaders(w http.ResponseWriter) {
 	w.Header().Set("Cache-Control", config.CacheControl())
+	w.Header().Set("Expires", time.Now().UTC().Add(config.CacheTime).Format(http.TimeFormat))
 }
 
 func cors(h http.Handler) http.HandlerFunc {
diff --git a/pkg/config/config.go b/pkg/config/config.go
index c5775c8..622c013 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -4,6 +4,7 @@ package config
 import (
 	"fmt"
 	"os"
+	"time"
 )
 
 func PortDir() string {
@@ -70,6 +71,8 @@ func CacheControl() string {
 	return getEnv("SOKO_CACHE_CONTROL", "max-age=300")
 }
 
+const CacheTime = 5 * time.Minute
+
 func UserAgent() string {
 	return fmt.Sprintf("Gentoo Soko %s/packages.gentoo.org/gpackages@gentoo.org", Version())
 }