diff --git a/lib/galaxy/app_unittest_utils/galaxy_mock.py b/lib/galaxy/app_unittest_utils/galaxy_mock.py
index 6351b73fb9f..d738864a93a 100644
--- a/lib/galaxy/app_unittest_utils/galaxy_mock.py
+++ b/lib/galaxy/app_unittest_utils/galaxy_mock.py
@@ -282,7 +282,7 @@ class MockTrans:
         self.security = self.app.security
         self.history = history
 
-        self.request: Any = Bunch(headers={}, body=None)
+        self.request: Any = Bunch(headers={}, is_body_readable=False)
         self.response: Any = Bunch(headers={}, set_content_type=lambda i: None)
 
     def check_csrf_token(self, payload):
diff --git a/lib/galaxy/web/framework/decorators.py b/lib/galaxy/web/framework/decorators.py
index 0792d2e3f91..b93f55c5af5 100644
--- a/lib/galaxy/web/framework/decorators.py
+++ b/lib/galaxy/web/framework/decorators.py
@@ -158,7 +158,7 @@ def legacy_expose_api(func, to_json=True, user_required=True):
         if user_required and trans.anonymous:
             error_message = "API Authentication Required for this request"
             return error
-        if trans.request.body:
+        if trans.request.is_body_readable:
             try:
                 kwargs["payload"] = __extract_payload_from_request(trans, func, kwargs)
             except ValueError:
@@ -296,7 +296,7 @@ def expose_api(func, to_json=True, user_required=True, user_or_session_required=
                     err_msg="API authentication or Galaxy session required for this request",
                 )
 
-        if trans.request.body:
+        if trans.request.is_body_readable:
             try:
                 kwargs["payload"] = __extract_payload_from_request(trans, func, kwargs)
             except ValueError: