g dfn HttpRequest對(duì)象擁有的屬性和方法：
self.GET = QueryDict(mutable=True) #GET請求的參數(shù)字典集合
self.POST = QueryDict(mutable=True) #POST請求的參數(shù)字典集合
self.COOKIES = {} #獲取cookie
self.META = {} #獲取META
self.FILES = MultiValueDict()
self.path = '' #獲取請求路徑
self.path_info = ''
self.method = None #請求方法類型
self.resolver_match = None
self._post_parse_error = False
self.content_type = None #獲取content_type
self.content_params = None
get_host(self): #獲取host
get_port(self)：#獲取端口port
get_full_path(self, force_append_slash=False): #獲取全路徑
