Remember that the request may be nil

Author: k1LoW

rfc9111/shared.go

@@ -198,7 +198,9 @@ func (s *Shared) Storable(req *http.Request, res *http.Response, now time.Time)
 func (s *Shared) Handle(req *http.Request, cachedReq *http.Request, cachedRes *http.Response, do func(*http.Request) (*http.Response, error), now time.Time) (useCached bool, r *http.Response, _ error) {
 	defer func() {
 		// 5.1 Age (https://httpwg.org/specs/rfc9111.html#rfc.section.5.1)
-		setAgeHeader(useCached, r.Header, now)
+		if r != nil {
+			setAgeHeader(useCached, r.Header, now)
+		}
 	}()
 
 	if cachedReq == nil || cachedRes == nil {