diff --git a/graphql_server/__init__.py b/graphql_server/__init__.py
index 49a52a2..58b2f7e 100644
--- a/graphql_server/__init__.py
+++ b/graphql_server/__init__.py
@@ -203,6 +203,7 @@ def load_json_body(data):
 
 
 __all__ = [
+    "HttpQueryError",
     "default_format_error",
     "SkipException",
     "run_http_query",