Python mendapat kod status permintaan HTTP (200, 404, dsb.)

Question

Python mendapat kod status permintaan HTTP (200, 404, dsb.) tanpa mengakses keseluruhan kod sumber halaman, yang merupakan pembaziran sumber:

输入：segmentfault.com 输出：200
输入：segmentfault.com/nonexistant 输出：404

Answer 1

Artikel rujukan: Senarai skrip Python praktikal

http bukan sahaja get方法（请求头部+正文），还有head方法，只请求头部.

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

Answer 2

Anda menggunakan kaedah get请求就会请求整个头部+正文, 可以试下head untuk mengakses terus pengepala!

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