diff --git a/src/crowdstrike/foundry/function/model.py b/src/crowdstrike/foundry/function/model.py
index 6789161..0f265cf 100644
--- a/src/crowdstrike/foundry/function/model.py
+++ b/src/crowdstrike/foundry/function/model.py
@@ -52,6 +52,24 @@ def map_dict_to_dataclass(d: Dict, dc) -> [None, dataclass]:
     return dc
 
 
+def _canonize_header(h: str) -> str:
+    """
+    Converts a header key into its canonical version.
+    :param h: Header key.
+    :return: Canonized version.
+    """
+    canon = ''
+    upper = True
+    for c in h:
+        if upper:
+            canon += c.upper()
+        else:
+            canon += c.lower()
+
+        upper = c == '-'
+    return canon
+
+
 @dataclass
 class APIError:
     """
@@ -102,6 +120,11 @@ def from_json_payload(payload: str) -> 'Request':
         req_dict = json.loads(payload)
         req = map_dict_to_dataclass(req_dict, Request())
         req.params = map_dict_to_dataclass(req_dict.get('params', None), Params())
+        if req.params.header is not None and len(req.params.header) > 0:
+            h = {}
+            for k, v in req.params.header.items():
+                h[_canonize_header(k)] = v
+            req.params.header = h
         return req
 
 
diff --git a/tests/crowdstrike/foundry/function/test_model.py b/tests/crowdstrike/foundry/function/test_model.py
index 8fb313c..82387fa 100644
--- a/tests/crowdstrike/foundry/function/test_model.py
+++ b/tests/crowdstrike/foundry/function/test_model.py
@@ -37,7 +37,9 @@ def test_from_json_payload(self):
             method='GET',
             params=Params(
                 header={
-                    'xyz': ['a', 'b'],
+                    'Accepts': ['application/json'],
+                    'Content-Type': ['application/json'],
+                    'Xyz': ['a', 'b'],
                 },
                 query={
                     'ijk': ['4', '5', '6'],
@@ -56,6 +58,8 @@ def test_from_json_payload(self):
             'method': 'GET',
             'params': {
                 'header': {
+                    'accepts': ['application/json'],
+                    'ContENt-type': ['application/json'],
                     'xyz': ['a', 'b'],
                 },
                 'query': {