Added 'Setting headers' and 'Telling the browser to treat the response as a...

      content, you can't use the ``HttpResponse`` instance as a file-like

      object. Doing so will raise ``Exception``.

Setting headers

~~~~~~~~~~~~~~~

To set a header in your response, just treat it like a dictionary::

    >>> response = HttpResponse()

    >>> response['Pragma'] = 'no-cache'

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

``mimetype`` argument and set the ``Content-Disposition`` header. For example,

this is how you might return a Microsoft Excel spreadsheet::

    >>> response = HttpResponse(my_data, mimetype='application/vnd.ms-excel')

    >>> response['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.

Methods

-------

    but since this is actually the value included in the HTTP ``Content-Type``

    header, it can also include the character set encoding, which makes it

    more than just a MIME type specification. If ``mimetype`` is specified

    (not None), that value is used. Otherwise, ``content_type`` is used. If

    (not ``None``), that value is used. Otherwise, ``content_type`` is used. If

    neither is given, the ``DEFAULT_CONTENT_TYPE`` setting is used.

``__setitem__(header, value)``