错误如下：
unicodedecodeerror: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte
抓取的网页检查：
content-encoding: gzip
需要做gzip的解压
request = urllib.request.request(url = url, headers = request_headers)
reponse = urllib.request.urlopen(request,timeout = timeout)
data = reponse.read()
buff = bytesio(data)
f = gzip.gzipfile(fileobj=buff)
res = f.read().decode('utf-8')
print(res)
在请求的头部加入："accept-encoding":"gzip",
如果是下面：则每次返回有可能是gzip压缩，有可能不压缩，web 应用干脆为了迁就 ie 直接输出原始 deflate
accept-encoding: gzip, deflate在请求的头部加入：
"accept-encoding":"gzip",
