id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
27853	When AdminEmailHandler is configured with include_html, DisallowedHost causes a 500 instead of a 400	Douglas Thrift	nobody	"It looks like when `AdminEmailHandler` is configured with include_html a `DisallowedHost` causes a 500 instead of a 400 because it is trying to render the HTML error page for that to include in the email, but trying to render that HTML is triggering its own `DisallowedHost` because it thinks it is being requested by the same disallowed host rather than ignoring it since it is rendering for an email.

{{{
Starting development server at http://127.0.0.1:8000/
Quit the server with CONTROL-C.
Traceback (most recent call last):
  File ""/usr/local/lib/python2.7/wsgiref/handlers.py"", line 85, in run
    self.result = application(self.environ, self.start_response)
  File ""/usr/local/lib/python2.7/site-packages/django/core/handlers/wsgi.py"", line 189, in __call__
    response = self.get_response(request)
  File ""/usr/local/lib/python2.7/site-packages/django/core/handlers/base.py"", line 204, in get_response
    'request': request
  File ""/usr/local/lib/python2.7/logging/__init__.py"", line 1193, in error
    self._log(ERROR, msg, args, **kwargs)
  File ""/usr/local/lib/python2.7/logging/__init__.py"", line 1286, in _log
    self.handle(record)
  File ""/usr/local/lib/python2.7/logging/__init__.py"", line 1296, in handle
    self.callHandlers(record)
  File ""/usr/local/lib/python2.7/logging/__init__.py"", line 1336, in callHandlers
    hdlr.handle(record)
  File ""/usr/local/lib/python2.7/logging/__init__.py"", line 759, in handle
    self.emit(record)
  File ""/usr/local/lib/python2.7/site-packages/django/utils/log.py"", line 128, in emit
    html_message = reporter.get_traceback_html() if self.include_html else None
  File ""/usr/local/lib/python2.7/site-packages/django/views/debug.py"", line 384, in get_traceback_html
    return t.render(c)
  File ""/usr/local/lib/python2.7/site-packages/django/template/base.py"", line 210, in render
    return self._render(context)
  File ""/usr/local/lib/python2.7/site-packages/django/template/base.py"", line 202, in _render
    return self.nodelist.render(context)
  File ""/usr/local/lib/python2.7/site-packages/django/template/base.py"", line 905, in render
    bit = self.render_node(node, context)
  File ""/usr/local/lib/python2.7/site-packages/django/template/debug.py"", line 79, in render_node
    return node.render(context)
  File ""/usr/local/lib/python2.7/site-packages/django/template/defaulttags.py"", line 329, in render
    return nodelist.render(context)
  File ""/usr/local/lib/python2.7/site-packages/django/template/base.py"", line 905, in render
    bit = self.render_node(node, context)
  File ""/usr/local/lib/python2.7/site-packages/django/template/debug.py"", line 79, in render_node
    return node.render(context)
  File ""/usr/local/lib/python2.7/site-packages/django/template/debug.py"", line 89, in render
    output = self.filter_expression.resolve(context)
  File ""/usr/local/lib/python2.7/site-packages/django/template/base.py"", line 648, in resolve
    obj = self.var.resolve(context)
  File ""/usr/local/lib/python2.7/site-packages/django/template/base.py"", line 789, in resolve
    value = self._resolve_lookup(context)
  File ""/usr/local/lib/python2.7/site-packages/django/template/base.py"", line 849, in _resolve_lookup
    current = current()
  File ""/usr/local/lib/python2.7/site-packages/django/http/request.py"", line 152, in build_absolute_uri
    host=self.get_host(),
  File ""/usr/local/lib/python2.7/site-packages/django/http/request.py"", line 102, in get_host
    raise DisallowedHost(msg)
DisallowedHost: Invalid HTTP_HOST header: 'localhost:8000'. You may need to add u'localhost' to ALLOWED_HOSTS.
[17/Feb/2017 06:48:12] ""GET / HTTP/1.1"" 500 59
}}}"	Bug	closed	Error reporting	1.8	Normal	duplicate			Unreviewed	0	0	0	0	0	0