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HTTP server that implements the Python WSGI protocol (PEP 333, rev 1.21).
Based on wsgiref.simple_server which is part of the standard library since 2.5.
This is a simple server for use in testing or debugging Django apps. It hasn't
been reviewed for security issues. DON'T USE IT FOR PRODUCTION USE!
import logging
import socket
import socketserver
import sys
from wsgiref import simple_server
from django.core.exceptions import ImproperlyConfigured
from django.core.wsgi import get_wsgi_application
from django.utils import six
from django.utils.module_loading import import_string
__all__ = ('WSGIServer', 'WSGIRequestHandler')
logger = logging.getLogger('django.server')
def get_internal_wsgi_application():
Loads and returns the WSGI application as configured by the user in
``settings.WSGI_APPLICATION``. With the default ``startproject`` layout,
this will be the ``application`` object in ``projectname/``.
This function, and the ``WSGI_APPLICATION`` setting itself, are only useful
for Django's internal server (runserver); external WSGI servers should just
be configured to point to the correct application object directly.
If settings.WSGI_APPLICATION is not set (is ``None``), we just return
whatever ``django.core.wsgi.get_wsgi_application`` returns.
from django.conf import settings
app_path = getattr(settings, 'WSGI_APPLICATION')
if app_path is None:
return get_wsgi_application()
return import_string(app_path)
except ImportError as e:
msg = (
"WSGI application '%(app_path)s' could not be loaded; "
"Error importing module: '%(exception)s'" % ({
'app_path': app_path,
'exception': e,
six.reraise(ImproperlyConfigured, ImproperlyConfigured(msg),
def is_broken_pipe_error():
exc_type, exc_value = sys.exc_info()[:2]
return issubclass(exc_type, socket.error) and exc_value.args[0] == 32
class WSGIServer(simple_server.WSGIServer):
"""BaseHTTPServer that implements the Python WSGI protocol"""
request_queue_size = 10
def __init__(self, *args, **kwargs):
if kwargs.pop('ipv6', False):
self.address_family = socket.AF_INET6
self.allow_reuse_address = kwargs.pop('allow_reuse_address', True)
super(WSGIServer, self).__init__(*args, **kwargs)
def server_bind(self):
"""Override server_bind to store the server name."""
super(WSGIServer, self).server_bind()
def handle_error(self, request, client_address):
if is_broken_pipe_error():"- Broken pipe from %s\n", client_address)
super(WSGIServer, self).handle_error(request, client_address)
# Inheriting from object required on Python 2.
class ServerHandler(simple_server.ServerHandler):
def handle_error(self):
# Ignore broken pipe errors, otherwise pass on
if not is_broken_pipe_error():
super(ServerHandler, self).handle_error()
class WSGIRequestHandler(simple_server.WSGIRequestHandler):
def address_string(self):
# Short-circuit parent method to not call socket.getfqdn
return self.client_address[0]
def log_message(self, format, *args):
extra = {
'request': self.request,
'server_time': self.log_date_time_string(),
if args[1][0] == '4':
# 0x16 = Handshake, 0x03 = SSL 3.0 or TLS 1.x
if args[0].startswith(str('\x16\x03')):
extra['status_code'] = 500
"You're accessing the development server over HTTPS, but "
"it only supports HTTP.\n", extra=extra,
if args[1].isdigit() and len(args[1]) == 3:
status_code = int(args[1])
extra['status_code'] = status_code
if status_code >= 500:
level = logger.error
elif status_code >= 400:
level = logger.warning
level =
level =
level(format, *args, extra=extra)
def get_environ(self):
# Strip all headers with underscores in the name before constructing
# the WSGI environ. This prevents header-spoofing based on ambiguity
# between underscores and dashes both normalized to underscores in WSGI
# env vars. Nginx and Apache 2.4+ both do this as well.
for k, v in self.headers.items():
if '_' in k:
del self.headers[k]
return super(WSGIRequestHandler, self).get_environ()
def handle(self):
"""Copy of WSGIRequestHandler, but with different ServerHandler"""
self.raw_requestline = self.rfile.readline(65537)
if len(self.raw_requestline) > 65536:
self.requestline = ''
self.request_version = ''
self.command = ''
if not self.parse_request(): # An error code has been sent, just exit
handler = ServerHandler(
self.rfile, self.wfile, self.get_stderr(), self.get_environ()
handler.request_handler = self # backpointer for logging
def run(addr, port, wsgi_handler, ipv6=False, threading=False, server_cls=WSGIServer):
server_address = (addr, port)
if threading:
httpd_cls = type('WSGIServer', (socketserver.ThreadingMixIn, server_cls), {})
httpd_cls = server_cls
httpd = httpd_cls(server_address, WSGIRequestHandler, ipv6=ipv6)
if threading:
# ThreadingMixIn.daemon_threads indicates how threads will behave on an
# abrupt shutdown; like quitting the server by the user or restarting
# by the auto-reloader. True means the server will not wait for thread
# termination before it quits. This will make auto-reloader faster
# and will prevent the need to kill the server manually if a thread
# isn't terminating correctly.
httpd.daemon_threads = True