Fixed #8409 -- The runserver now uses conditional GET for admin media files,...

import mimetypes

import os

import re

import stat

import sys

import urllib

                status = '401 UNAUTHORIZED'

                headers = {'Content-type': 'text/plain'}

                output = ['Permission denied: %s' % file_path]

            else:

                # This is a very simple implementation of conditional GET with

                # the Last-Modified header. It makes media files a bit speedier

                # because the files are only read off disk for the first

                # request (assuming the browser/client supports conditional

                # GET).

                mtime = http_date(os.stat(file_path)[stat.ST_MTIME])

                headers = {'Last-Modified': mtime}

                if environ.get('HTTP_IF_MODIFIED_SINCE', None) == mtime:

                    status = '304 NOT MODIFIED'

                    output = []

                else:

                    status = '200 OK'

                headers = {}

                    mime_type = mimetypes.guess_type(file_path)[0]

                    if mime_type:

                        headers['Content-Type'] = mime_type