fix(httplib): prevent leaking localhost:3000 in public links (#39217)

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/context/api.go

@@ -19,6 +19,7 @@ import (
 	"gitea.dev/modules/cache"
 	"gitea.dev/modules/git"
 	"gitea.dev/modules/httpcache"
+	"gitea.dev/modules/httplib"
 	"gitea.dev/modules/log"
 	"gitea.dev/modules/paginator"
 	"gitea.dev/modules/reqctx"
@@ -257,8 +258,8 @@ func APIContexter() func(http.Handler) http.Handler {
 				Repo:  &Repository{},
 				Org:   &APIOrganization{},
 			}
-
 			ctx.SetContextValue(apiContextKey, ctx)
+			httplib.MarkRequestSupportPublicURL(ctx)
 
 			// FIXME: GLOBAL-PARSE-FORM: see more details in another FIXME comment
 			if ctx.Req.Method == http.MethodPost && strings.Contains(ctx.Req.Header.Get("Content-Type"), "multipart/form-data") {