fix: disable cache for 302 redirect (close #2216)

server/handles/down.go

@@ -37,6 +37,7 @@ func Down(c *gin.Context) {
 			return
 		}
 		c.Header("Referrer-Policy", "no-referrer")
+		c.Header("Cache-Control", "max-age=0, no-cache, no-store, must-revalidate")
 		c.Redirect(302, link.URL)
 	}
 }

server/webdav/webdav.go

@@ -232,6 +232,7 @@ func (h *Handler) handleGetHeadPost(w http.ResponseWriter, r *http.Request) (sta
 			common.GetApiUrl(r),
 			utils.EncodePath(reqPath, true),
 			sign.Sign(path.Base(reqPath)))
+		w.Header().Set("Cache-Control", "max-age=0, no-cache, no-store, must-revalidate")
 		http.Redirect(w, r, u, 302)
 	} else {
 		link, _, err := fs.Link(ctx, reqPath, model.LinkArgs{IP: utils.ClientIP(r)})