Python pycurl

#!/usr/bin/env python
# -*- coding:utf-8 -*

from __future__ import print_function
import pycurl
import re
import sys
try:
    from io import BytesIO
except ImportError:
    from StringIO import StringIO as ByteIO

headers = {}
def header_function(header_line):
    header_line = header_line.decode('iso-8859-1')
    if ":" not in header_line:
        return

    name, value = header_line.split(":",1)
    name = name.strip()
    value = value.strip()
    name = name.lower()
    headers[name] = value

URL = 'http://pycurl.sourceforge.net'
buffer =BytesIO()
c = pycurl.Curl()

c.setopt(c.URL,URL)
c.setopt(c.WRITEFUNCTION,buffer.write)
c.setopt(c.HEADERFUNCTION, header_function)
try:
    c.perform()
except Exception,e:
    print("connection error:" + str(e))
    buffer.close()
    c.close()
    sys.exit()

encoding = None
if 'content-type' in headers:
    content_type = headers['content-type'].lower()
    match = re.search('charset=(\S+)', content_type)
    if match:
        encoding = match.group(1)
        print('Decoding using %s' %encoding)

if encoding is None:
    encoding = 'iso-8859-1'
    print('Assuming encoding is %s' % encoding)

body = buffer.getvalue()
HTTP_CODE = c.getinfo(c.HTTP_CODE)
NAMELOOKUP_TIME = c.getinfo(c.NAMELOOKUP_TIME)
CONNECT_TIME = c.getinfo(c.CONNECT_TIME)
PRETRANSFER_TIME = c.getinfo(c.PRETRANSFER_TIME)
STARTTARNSFER_TIME = c.getinfo(c.STARTTRANSFER_TIME)
TOTAL_TIME = c.getinfo(c.TOTAL_TIME)
SIZE_DOWNLOAD = c.getinfo(c.SIZE_DOWNLOAD)
HEADER_SIZE = c.getinfo(c.HEADER_SIZE)
SPEED_DOWNLOAD = c.getinfo(c.SPEED_DOWNLOAD)

print("HTTP状态码:%s" % HTTP_CODE)
print("DNS解析时间:%.3f ms" %(NAMELOOKUP_TIME*1000))
print("建立连接时间:%.3f ms" %(CONNECT_TIME*1000))
print("准备传输时间:%.3f ms" %(PRETRANSFER_TIME*1000))
print("传输开始时间:%.3f ms" %(STARTTARNSFER_TIME*1000))
print("传输结束总时间:%.3f ms" %(TOTAL_TIME*1000))
print("下载数据包大小:%d bytes/s" % SIZE_DOWNLOAD)
print("HTTP头部大小:%d byte" %HEADER_SIZE)
print("平均下载速度:%d bytes/s" % SPEED_DOWNLOAD)

buffer.close()
c.close()