爬虫 http原理,梨视频,github登陆实例,requests请求参数小总结

时间：2023-03-09 19:04:19
爬虫 http原理,梨视频,github登陆实例,requests请求参数小总结

回顾:http协议基于请求响应的方式，请求：请求首行 请求头{'keys':vales} 请求体 ；响应:响应首行，响应头{'keys':'vales'}，响应体。

import socket

sock=socket.socket()

sock.bind(("127.0.0.1",8808))

sock.listen(5)

while 1:

    print("server waiting.....")

    conn,addr=sock.accept()

    data=conn.recv(1024)

    print("data", data)

    # 读取html文件

    with open("login.html","rb") as f:

        data=f.read()

    conn.send((b"HTTP/1.1 200 OK\r\nContent-type:text/html\r\n\r\n%s"%data))

    conn.close()

基于socket的浏览器交互

'''

    GET请求

    # 请求首行

    GET / HTTP/1.1\r\n

    # get请求后面的参数

    b'GET /?name=wd&age=11 HTTP/1.1\r\n

    # 请求头

    Host: 127.0.0.1:8008\r\n

    Connection: keep-alive\r\n

    Cache-Control: max-age=0\r\n

    Upgrade-Insecure-Requests: 1\r\n

    User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64)

    AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181Safari/537.36\r\n

Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8\r\nAccept-Encoding: gzip, deflate, br\r\n

Accept-Language: zh-CN,zh;q=0.9\r\n Cookie:csrftoken=7xx6BxQDJ6KB0PM7qS8uTA892ACtooNbnnF4LDwlYk1Y7S7nTS81FBqwruizHsxF\r\n\r\n'

    # 请求体（get请求，请求体为空）

    '''

   b''

    '''

    POST请求

    # 请求首行

    b'POST /?name=wd&age=11 HTTP/1.1\r\n

    # 请求头

    Host: 127.0.0.1:8008\r\n

Connection: keep-alive\r\n

Content-Length: 21\r\n

Cache-Control: max-age=0\r\n

Origin: http://127.0.0.1:8008\r\n

Upgrade-Insecure-Requests: 1\r\n

Content-Type: application/x-www-form-urlencoded\r\n

User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36\r\n

Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8\r\n

Referer: http://127.0.0.1:8008/?name=lqz&age=18\r\n

Accept-Encoding: gzip, deflate, br\r\n

Accept-Language: zh-CN,zh;q=0.9\r\n

Cookie:csrftoken=7xx6BxQDJ6KB0PM7qS8uTA892ACtooNbnnF4LDwlYk1Y7S7nTS81FBqwruizHsxF\r\n\r\n'

    # 请求体

    b'name=wd&password=11'

    '''

请求

b"HTTP/1.1 200 OK\r\n

Content-type:text/html\r\n\r\n

%s"%data

响应

http原理

点击详情

梨视频案例

#返回数据3种格式

#1.text                    匹配需要的东西

#2.content(二进制)    保存成图片,视频等

#3.json                    反序列化成字典或列表

#下载功能

def download(videos,title):

    if not os.path.exists('video'):

        os.mkdir('video')

    path=os.path.join('video',title)+'.mp4'

    res=requests.get(videos)

    with open(path,'wb') as f:

        f.write(res.content)

#起线程执行执行

if __name__ == '__main__':

    from concurrent.futures import ThreadPoolExecutor

    p=ThreadPoolExecutor(10)

    for i in parser_index(get_index()):

        dic=video_info(get_video(i))

        print(dic)

        p.submit(download,dic['video'],dic['title'])

    p.shutdown(wait=True)

#注意问题:梨视频下滑加载视频（是根据url的参数,例如分类下的视频显示多少）

github登陆实例

#get请求登陆页面 获取csrf随机字符串和cookies

#post请求登陆操作 携带csrf,输入的用户名密码等(请求体数据) 和 cookies,user-agent,referer等(请求头数据) 必须数据

数据是请求体还是请求头数据？ （我的理解是比如ajax里的data,django的返回数据都是请求体的数据. request.set_cookies('islogin':'true') request对象的数据为请求头的）

"""

1.请求登陆页面 获取token cookie

2.发生登陆的post请求,将用户名密码 和token 放在请求体中,cookie放在请求头中

"""

import requests

import re

login_url = "https://github.com/login"

#浏览器标识

headers = {"user-agent":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36"}

#请求登陆页面

res1 = requests.get(login_url,headers=headers)

print(res1.status_code)

# 从响应体中获取token

token = re.search('name="authenticity_token" value="(.*?)"',res1.text).group(1)

# 保存cookie

login_cookie = res1.cookies.get_dict()

print(login_cookie)

# 发送登陆请求

res2 = requests.post("https://github.com/session",

              headers={

                  "user-agent":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36"},

              cookies = login_cookie,

              data={

                "commit": "Sign in",

                "utf8": "✓",

                "authenticity_token": token,

                "login": "xxxxxxxxxxx",

                "password": "xxxxxxxxxxx"},

                # 是否允许自动重定向

                allow_redirects = False)

print(res2.status_code)

# 用户登录成功后的cookie

user_cookie = res2.cookies.get_dict()

# 携带用户cookies访问主页

res3 = requests.get("https://github.com/settings/profile",cookies = user_cookie,headers = headers)

print(res3.status_code)

print(res3.text)

# "https://github.com/settings/profile"

requests请求参数小总结

#get请求参数

kwd = "吴秀波出轨门"

url = "https://www.baidu.com/s"

requests.get(url,headers=headers,params={"wd":kwd})

#post请求参数

requests.post("https://github.com/session",

              headers={

                  "user-agent":"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36"},

              cookies = login_cookie,

              data={

                "commit": "Sign in",

                "utf8": "✓",

                "authenticity_token": token,

                "login": "ssssss",

                "password": "ssssss"},

                # 是否允许自动重定向

                allow_redirects = False)

#返回值处理

# response.cookies.get_dict() #获取cookies

# response.status_code # 状态码

# response.text # 将结果以文本的形式返回

# response.content # 将结果以二进制的方式返回

# response.json() # 将数据直接反序列化得到字典或是列表

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