Switch to using a case insensitive dictionary for headers instead of doing

.title() on each header key

modules/github.py

@@ -41,7 +41,7 @@ class Module(ModuleManager.BaseModule):
                 )["payload"][0]
         data = json.loads(payload)
 
-        github_event = event["headers"]["X-Github-Event"]
+        github_event = event["headers"]["X-GitHub-Event"]
         if github_event == "ping":
             return True
 

modules/rest_api.py

@@ -14,7 +14,7 @@ class Handler(http.server.BaseHTTPRequestHandler):
         _, _, endpoint = path[1:].partition("/")
         endpoint, _, args = endpoint.partition("/")
         args = list(filter(None, args.split("/")))
-        headers = {key.title(): value for key, value in self.headers.items()}
+        headers = utils.CaseInsensitiveDict(dict(self.headers.items()))
 
         response = ""
         code = 404

src/utils/__init__.py

@@ -171,3 +171,11 @@ def top_10(items: typing.Dict[typing.Any, typing.Any],
             value_format(items[key])))
 
     return top_10_items
+
+class CaseInsensitiveDict(dict):
+    def __init__(self, other):
+        dict.__init__(self, ((k.lower(), v) for k, v in other))
+    def __getitem__(self, key):
+        return dict.__getitem__(self, key.lower())
+    def __setitem__(self, key):
+        return dict.__setitem__(self, key.lower())