diff --git a/aioauth/collections.py b/aioauth/collections.py
index 9082ad4..299e0fd 100644
--- a/aioauth/collections.py
+++ b/aioauth/collections.py
@@ -9,6 +9,7 @@
 """
 
 from collections import UserDict
+from typing import Any
 
 
 class HTTPHeaderDict(UserDict):
@@ -33,8 +34,24 @@ class HTTPHeaderDict(UserDict):
         d['hElLo'] == 'world' # >>> True
     """
 
+    def __init__(self, dict=None, **kwargs):
+        """Object initialization."""
+        super().__init__(dict, **kwargs)
+        self.data = {k.lower(): v for k, v in self.data.items()}
+
     def __setitem__(self, key: str, value: str):
         super().__setitem__(key.lower(), value)
 
     def __getitem__(self, key: str):
         return super().__getitem__(key.lower())
+
+    def __delitem__(self, key: str):
+        """Item deletion."""
+        return super().__delitem__(key.lower())
+
+    def get(self, key: str, default: Any = None):
+        """Case-insentive get."""
+        try:
+            return self[key]
+        except KeyError:
+            return default