一、什么是session
session指的是一个会话。

二、需求描述
突破12306图片验证码(也就是验证成功)

三、策略
账号正确 密码错误 验证码错误 {“result_message”:“验证码校验失败”,“result_code”:“5”}
账号正确 密码错误 验证码正确 {“result_message”:“验证码校验成功”,“result_code”:“4”}
账号正确 密码正确 验证码正确 OK
根据上面3次的尝试,得到结论:12306是先验证成功后,才会去看账号和密码是否正确

四、步骤
1、 明确目标url,发送post请求 ,并携带数据

(1)先在登录页面点击右键检查,然后我们输入错误账户、错误密码、正确的验证码,点击登录;
(2)点击network,在name中找到Response显示的是‘验证码校验成功’,对应的headers中的url就是我们的目标url:
(3)在headers中下方的Query String Parameters中找到要携带的数据:
answer: 46,45,38,112
rand: sjrand
login_site: E

(补充:从携带数据可以看出,这实际上是一个坐标验证。)
2 、获取12306的图片验证码
鼠标放在验证图片上,点击右键–在新标签页中打开图片

得到:

从它的url可以看出,这个地址是经过base64伪加密的。
base64伪加密是用64个字符来表示任意的二进制数据的方法。( A-Z A-Z 0 - 9 + / 这64个字符)
复制这个url,并通过下面的得到,得到验证图片。

import base64url ='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'img_data = base64.b64decode(url) # 返回的是二进制数据
print(type(img_data))
fn = open('code.png','wb')
fn.write(img_data)
fn.close()

结果:

3 、点击正确的图片

import requestsdef login():# 获取验证码图片pic_response = requests.get('https://kyfw.12306.cn/passport/captcha/captcha-image?login_site=E&module=login&rand=sjrand')codeImage = pic_response.contentfn = open('code2.png','wb')fn.write(codeImage)fn.close()# 从验证码图片的左上角为 (0,0),截图看正确答案的坐标,并在input要求输入时输入codeStr = input('请输入验证码坐标:')headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.128 Safari/537.36'}data = {'answer': codeStr,'rand': 'sjrand','login_site': 'E'}response =requests.post('https://kyfw.12306.cn/passport/captcha/captcha-check',data=data,headers=headers)print(response.text)login()


189,50就是我们要在input时输入的。
结果:

仍然提示不对,这时就用到session了,要保持会话的状态。
语法:req = requests.session()

import requests
req = requests.session() # 保持会话def login():# 获取验证码图片pic_response = req.get('https://kyfw.12306.cn/passport/captcha/captcha-image?login_site=E&module=login&rand=sjrand')codeImage = pic_response.contentfn = open('code2.png','wb')fn.write(codeImage)fn.close()# 从验证码图片的左上角为 (0,0),截图看正确答案的坐标,并在input要求输入时输入codeStr = input('请输入验证码坐标:')headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.128 Safari/537.36'}data = {'answer': codeStr,'rand': 'sjrand','login_site': 'E'}response = req.post('https://kyfw.12306.cn/passport/captcha/captcha-check',data=data,headers=headers)print(response.text)login()

补充:当出现要点击多个图片验证时,如下输入:

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