diff --git a/mongoose.c b/mongoose.c
index cac7208f..420621d1 100644
--- a/mongoose.c
+++ b/mongoose.c
@@ -2417,8 +2417,8 @@ static void http_cb(struct mg_connection *c, int ev, void *ev_data) {
           require_content_len = status >= 200 && status != 204 && status != 304;
         }
         if (require_content_len) {
-          mg_http_reply(c, 411, "", "");
-          MG_ERROR(("%s", "Content length missing from request"));
+          if (!c->is_client) mg_http_reply(c, 411, "", "");
+          MG_ERROR(("Content length missing from %s", is_response ? "response" : "request"));
         }
       }
 
diff --git a/src/http.c b/src/http.c
index 68ec32ad..c8078961 100644
--- a/src/http.c
+++ b/src/http.c
@@ -1059,8 +1059,8 @@ static void http_cb(struct mg_connection *c, int ev, void *ev_data) {
           require_content_len = status >= 200 && status != 204 && status != 304;
         }
         if (require_content_len) {
-          mg_http_reply(c, 411, "", "");
-          MG_ERROR(("%s", "Content length missing from request"));
+          if (!c->is_client) mg_http_reply(c, 411, "", "");
+          MG_ERROR(("Content length missing from %s", is_response ? "response" : "request"));
         }
       }