fix: add headers to http.HttpResponseBase constructor (#564)

* fix: add headers to http.HttpResponseBase constructor

fixes #563

* fix: correct Dict() with Dict[]

* feat: add ResponseHeaders typing

* fix: correct HttpResponseBase.headers type

* fix: add missing ...s

* fix: add CaseInsensitiveMapping import

* fix: make Dict -> Dict[str, str]

django-stubs/http/response.pyi

@@ -6,24 +6,35 @@ from typing import Any, Dict, Iterable, Iterator, List, Optional, Tuple, Type, U
 from django.core.handlers.wsgi import WSGIRequest
 from django.http.cookie import SimpleCookie
 from django.test.client import Client
-
+from django.utils.datastructures import CaseInsensitiveMapping
 from django.template import Context, Template
 from django.urls import ResolverMatch
 
 class BadHeaderError(ValueError): ...
 
+class ResponseHeaders(CaseInsensitiveMapping):
+    store: Dict[str, str] = ...
+    def __init__(self, data: Dict[str, str]) -> None: ...
+    def _convert_to_charset(self, value: Union[bytes, str], charset: str, mime_encode: str=...) -> str: ...
+    def __delitem__(self, key: str) -> None: ...
+    def __setitem__(self, key: str, value: str) -> None: ...
+    def pop(self, key: str, default: Optional[str] = ...) -> str: ...
+    def setdefault(self, key: str, value: str) -> None: ...
+
 class HttpResponseBase(Iterable[Any]):
     status_code: int = ...
     cookies: SimpleCookie = ...
     reason_phrase: str = ...
     charset: str = ...
     closed: bool = ...
+    headers: ResponseHeaders = ...
     def __init__(
         self,
         content_type: Optional[str] = ...,
         status: Optional[int] = ...,
         reason: Optional[str] = ...,
         charset: Optional[str] = ...,
+        headers: Optional[Dict[str, str]] = ...,
     ) -> None: ...
     def serialize_headers(self) -> bytes: ...
     def __setitem__(self, header: Union[str, bytes], value: Union[str, bytes, int]) -> None: ...