Fixed #32002 -- Added headers parameter to HttpResponse and subclasses.

docs/howto/outputting-csv.txt

@@ -20,8 +20,10 @@ Here's an example::
 
     def some_view(request):
         # Create the HttpResponse object with the appropriate CSV header.
-        response = HttpResponse(content_type='text/csv')
-        response.headers['Content-Disposition'] = 'attachment; filename="somefilename.csv"'
+        response = HttpResponse(
+            content_type='text/csv',
+            headers={'Content-Disposition': 'attachment; filename="somefilename.csv"'},
+        )
 
         writer = csv.writer(response)
         writer.writerow(['First row', 'Foo', 'Bar', 'Baz'])
@@ -86,10 +88,11 @@ the assembly and transmission of a large CSV file::
         rows = (["Row {}".format(idx), str(idx)] for idx in range(65536))
         pseudo_buffer = Echo()
         writer = csv.writer(pseudo_buffer)
-        response = StreamingHttpResponse((writer.writerow(row) for row in rows),
-                                         content_type="text/csv")
-        response.headers['Content-Disposition'] = 'attachment; filename="somefilename.csv"'
-        return response
+        return StreamingHttpResponse(
+            (writer.writerow(row) for row in rows),
+            content_type="text/csv",
+            headers={'Content-Disposition': 'attachment; filename="somefilename.csv"'},
+        )
 
 Using the template system
 =========================
@@ -108,8 +111,10 @@ Here's an example, which generates the same CSV file as above::
 
     def some_view(request):
         # Create the HttpResponse object with the appropriate CSV header.
-        response = HttpResponse(content_type='text/csv')
-        response.headers['Content-Disposition'] = 'attachment; filename="somefilename.csv"'
+        response = HttpResponse(
+            content_type='text/csv'
+            headers={'Content-Disposition': 'attachment; filename="somefilename.csv"'},
+        )
 
         # The data is hard-coded here, but you could load it from a database or
         # some other source.

docs/ref/request-response.txt

@@ -724,6 +724,10 @@ by ``HttpResponse``.
 When using this interface, unlike a dictionary, ``del`` doesn't raise
 ``KeyError`` if the header field doesn't exist.
 
+You can also set headers on instantiation::
+
+    >>> response = HttpResponse(headers={'Age': 120})
+
 For setting the ``Cache-Control`` and ``Vary`` header fields, it is recommended
 to use the :func:`~django.utils.cache.patch_cache_control` and
 :func:`~django.utils.cache.patch_vary_headers` methods from
@@ -738,15 +742,19 @@ containing a newline character (CR or LF) will raise ``BadHeaderError``
 
     The :attr:`HttpResponse.headers` interface was added.
 
+    The ability to set headers on instantiation was added.
+
 Telling the browser to treat the response as a file attachment
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-To tell the browser to treat the response as a file attachment, use the
-``content_type`` argument and set the ``Content-Disposition`` header. For example,
-this is how you might return a Microsoft Excel spreadsheet::
+To tell the browser to treat the response as a file attachment, set the
+``Content-Type`` and ``Content-Disposition`` headers. For example, this is how
+you might return a Microsoft Excel spreadsheet::
 
-    >>> response = HttpResponse(my_data, content_type='application/vnd.ms-excel')
-    >>> response.headers['Content-Disposition'] = 'attachment; filename="foo.xls"'
+    >>> response = HttpResponse(my_data, headers={
+    ...     'Content-Type': 'application/vnd.ms-excel',
+    ...     'Content-Disposition': 'attachment; filename="foo.xls"',
+    ... })
 
 There's nothing Django-specific about the ``Content-Disposition`` header, but
 it's easy to forget the syntax, so we've included it here.
@@ -802,10 +810,10 @@ Attributes
 Methods
 -------
 
-.. method:: HttpResponse.__init__(content=b'', content_type=None, status=200, reason=None, charset=None)
+.. method:: HttpResponse.__init__(content=b'', content_type=None, status=200, reason=None, charset=None, headers=None)
 
-    Instantiates an ``HttpResponse`` object with the given page content and
-    content type.
+    Instantiates an ``HttpResponse`` object with the given page content,
+    content type, and headers.
 
     ``content`` is most commonly an iterator, bytestring, :class:`memoryview`,
     or string. Other types will be converted to a bytestring by encoding their
@@ -829,6 +837,12 @@ Methods
     given it will be extracted from ``content_type``, and if that
     is unsuccessful, the :setting:`DEFAULT_CHARSET` setting will be used.
 
+    ``headers`` is a :class:`dict` of HTTP headers for the response.
+
+    .. versionchanged:: 3.2
+
+        The ``headers`` parameter was added.
+
 .. method:: HttpResponse.__setitem__(header, value)
 
     Sets the given header name to the given value. Both ``header`` and

docs/ref/template-response.txt

@@ -57,7 +57,7 @@ Attributes
 Methods
 -------
 
-.. method:: SimpleTemplateResponse.__init__(template, context=None, content_type=None, status=None, charset=None, using=None)
+.. method:: SimpleTemplateResponse.__init__(template, context=None, content_type=None, status=None, charset=None, using=None, headers=None)
 
     Instantiates a :class:`~django.template.response.SimpleTemplateResponse`
     object with the given template, context, content type, HTTP status, and
@@ -90,6 +90,13 @@ Methods
         The :setting:`NAME <TEMPLATES-NAME>` of a template engine to use for
         loading the template.
 
+    ``headers``
+        A :class:`dict` of HTTP headers to add to the response.
+
+    .. versionchanged:: 3.2
+
+        The ``headers`` parameter was added.
+
 .. method:: SimpleTemplateResponse.resolve_context(context)
 
     Preprocesses context data that will be used for rendering a template.
@@ -149,7 +156,7 @@ Methods
 Methods
 -------
 
-.. method:: TemplateResponse.__init__(request, template, context=None, content_type=None, status=None, charset=None, using=None)
+.. method:: TemplateResponse.__init__(request, template, context=None, content_type=None, status=None, charset=None, using=None, headers=None)
 
     Instantiates a :class:`~django.template.response.TemplateResponse` object
     with the given request, template, context, content type, HTTP status, and
@@ -185,6 +192,13 @@ Methods
         The :setting:`NAME <TEMPLATES-NAME>` of a template engine to use for
         loading the template.
 
+    ``headers``
+        A :class:`dict` of HTTP headers to add to the response.
+
+    .. versionchanged:: 3.2
+
+        The ``headers`` parameter was added.
+
 The rendering process
 =====================
 

docs/releases/3.2.txt

@@ -332,6 +332,11 @@ Requests and Responses
   Both interfaces will continue to be supported. See
   :ref:`setting-header-fields` for details.
 
+* The new ``headers`` parameter of :class:`~django.http.HttpResponse`,
+  :class:`~django.template.response.SimpleTemplateResponse`, and
+  :class:`~django.template.response.TemplateResponse` allows setting response
+  :attr:`~django.http.HttpResponse.headers` on instantiation.
+
 Security
 ~~~~~~~~
 

docs/topics/class-based-views/index.txt

@@ -117,9 +117,10 @@ And the view::
 
         def head(self, *args, **kwargs):
             last_book = self.get_queryset().latest('publication_date')
-            response = HttpResponse()
-            # RFC 1123 date format
-            response.headers['Last-Modified'] = last_book.publication_date.strftime('%a, %d %b %Y %H:%M:%S GMT')
+            response = HttpResponse(
+                # RFC 1123 date format.
+                headers={'Last-Modified': last_book.publication_date.strftime('%a, %d %b %Y %H:%M:%S GMT')},
+            )
             return response
 
 If the view is accessed from a ``GET`` request, an object list is returned in