diff --git a/polyapi/__init__.py b/polyapi/__init__.py
index 7935843..0d811a3 100644
--- a/polyapi/__init__.py
+++ b/polyapi/__init__.py
@@ -1,5 +1,6 @@
 import os
 import sys
+import copy
 import truststore
 from typing import Any, Optional, overload, Literal
 from typing_extensions import TypedDict
@@ -22,6 +23,7 @@ class PolyCustomDict(TypedDict, total=False):
     executionApiKey: Optional[str]
     responseStatusCode: int
     responseContentType: Optional[str]
+    responseHeaders: Dict[str, str]
 
 
 class _PolyCustom:
@@ -31,6 +33,7 @@ def __init__(self):
             "executionApiKey": None,
             "responseStatusCode": 200,
             "responseContentType": None,
+            "responseHeaders": {},
         }
         self._execution_id_locked = False
 
@@ -63,6 +66,9 @@ def __getitem__(self, key: Literal["responseStatusCode"]) -> int: ...
     
     @overload
     def __getitem__(self, key: Literal["responseContentType"]) -> Optional[str]: ...
+
+    @overload
+    def __getitem__(self, key: Literal["responseHeaders"]) -> Dict[str, str]: ...
     
     def __getitem__(self, key: str) -> Any:
         return self.get(key)
@@ -75,6 +81,9 @@ def __setitem__(self, key: Literal["responseStatusCode"], value: int) -> None: .
     
     @overload
     def __setitem__(self, key: Literal["responseContentType"], value: Optional[str]) -> None: ...
+
+    @overload
+    def __setitem__(self, key: Literal["responseHeaders"], value: Dict[str, str]) -> None: ...
     
     def __setitem__(self, key: str, value: Any) -> None:
         self.set_once(key, value)
@@ -84,7 +93,7 @@ def __repr__(self) -> str:
 
     def copy(self) -> '_PolyCustom':
         new = _PolyCustom()
-        new._internal_store = self._internal_store.copy()
+        new._internal_store = copy.deepcopy(self._internal_store)
         new._execution_id_locked = self._execution_id_locked
         return new
 
diff --git a/polyapi/webhook.py b/polyapi/webhook.py
index 855c300..b27987d 100644
--- a/polyapi/webhook.py
+++ b/polyapi/webhook.py
@@ -65,6 +65,7 @@ async def handleEvent(data):
                     "data": resp,
                     "statusCode": polyCustom.get("responseStatusCode", 200),
                     "contentType": polyCustom.get("responseContentType", None),
+                    "headers": polyCustom.get("responseHeaders", {{}}),
                 }},
             }}, namespace="/events")
 
diff --git a/pyproject.toml b/pyproject.toml
index f5c2514..93e189b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,7 +3,7 @@ requires = ["setuptools>=61.2", "wheel"]
 
 [project]
 name = "polyapi-python"
-version = "0.3.7.dev4"
+version = "0.3.7.dev5"
 description = "The Python Client for PolyAPI, the IPaaS by Developers for Developers"
 authors = [{ name = "Dan Fellin", email = "dan@polyapi.io" }]
 dependencies = [