@hook('before_request')
def validate():
  """使用勾子处理页面或接口访问事件"""
  # 让bottle框架支持jquery ajax的RESTful风格的PUT和DELETE等请求
  REQUEST_METHOD = request.environ.get('REQUEST_METHOD')
  HTTP_ACCESS_CONTROL_REQUEST_METHOD = request.environ.get('HTTP_ACCESS_CONTROL_REQUEST_METHOD')
  if REQUEST_METHOD == 'OPTIONS' and HTTP_ACCESS_CONTROL_REQUEST_METHOD:
    request.environ['REQUEST_METHOD'] = HTTP_ACCESS_CONTROL_REQUEST_METHOD

class WSGIRequestHandler(BaseHTTPRequestHandler):

  server_version = "WSGIServer/" + __version__

  def get_environ(self):
    env = self.server.base_environ.copy()
    env['SERVER_PROTOCOL'] = self.request_version
    env['SERVER_SOFTWARE'] = self.server_version
    env['REQUEST_METHOD'] = self.command
    if '?' in self.path:
      path,query = self.path.split('?',1)
    else:
      path,query = self.path,''

    env['PATH_INFO'] = urllib.parse.unquote(path, 'iso-8859-1')
    env['QUERY_STRING'] = query

    host = self.address_string()
    if host != self.client_address[0]:
      env['REMOTE_HOST'] = host
    env['REMOTE_ADDR'] = self.client_address[0]

    if self.headers.get('content-type') is None:
      env['CONTENT_TYPE'] = self.headers.get_content_type()
    else:
      env['CONTENT_TYPE'] = self.headers['content-type']

    length = self.headers.get('content-length')
    if length:
      env['CONTENT_LENGTH'] = length

    for k, v in self.headers.items():
      k=k.replace('-','_').upper(); v=v.strip()
      if k in env:
        continue          # skip content length, type,etc.
      if 'HTTP_'+k in env:
        env['HTTP_'+k] += ','+v   # comma-separate multiple headers
      else:
        env['HTTP_'+k] = v

    # 让bottle框架支持jquery ajax的RESTful风格的PUT和DELETE等请求
    if 'REQUEST_METHOD' in env and env['REQUEST_METHOD'] == 'OPTIONS' and 'HTTP_ACCESS_CONTROL_REQUEST_METHOD' in env:
      env['REQUEST_METHOD'] = env['HTTP_ACCESS_CONTROL_REQUEST_METHOD']

    return env