參考文章：Python實用腳本清單

http不只get方法（請求頭部+正文），還有head方法，只請求頭部。

import httplib

def get_status_code(host, path="/"):
    """ This function retreives the status code of a website by requesting
        HEAD data from the host. This means that it only requests the headers.
        If the host cannot be reached or something else goes wrong, it returns
        None instead.
    """
    try:
        conn = httplib.HTTPConnection(host)
        conn.request("HEAD", path)
        return conn.getresponse().status
    except StandardError:
        return None
        
print get_status_code("segmentfault.com") # prints 200
print get_status_code("segmentfault.com", "/nonexistant") # prints 404

你用get請求就會請求整個頭部+正文, 可以試下head方法, 直接訪問頭部!

import requests
html = requests.head('http://segmentfault.com')    # 用head方法去请求资源头部
print html.status_code  # 状态码

html = requests.head('/nonexistant')   # 用head方法去请求资源头部
print html.status_code   # 状态码

# 输出:
200
404