通过python去爬网站，但是无法获取网站cookies

import requests
headers = {
'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36'
}
url = 'http://10.23.10.20/Login.aspx'
data = {
    '__EVENTTARGET':'', 
    '__EVENTARGUMENT':'',
    '__LASTFOCUS':'', 
    '__VIEWSTATE': '/wEPDwUKLTU4MDcwODY1NA9kFgICAw9kFgoCBA8QDxYGHg1EYXRhVGV4dEZpZWxkBQdSZXNOYW1lHg5EYXRhVmFsdWVGaWVsZAUIUGFyYUNvZGUeC18hRGF0YUJvdW5kZ2QQFQMM566A5L2T5Lit5paHBuiLseaWhwznuYHkvZPkuK3mlocVAwVaSC1DTgVFTi1VUwVaSC1ISxQrAwNnZ2cWAWZkAgUPDxYCHgdWaXNpYmxlaGRkAgYPDxYCHwNoZGQCBw8PFgIeBFRleHQFEumqjOivgeeggeW3suemgeeUqGRkAgsPDxYEHghDc3NDbGFzcwUFc3ViYnQeBF8hU0ICAmRkZDv8A1G1UoCThtCFhAOH9WUJNdJM/dRKUFJVTapERgX8',
    '__VIEWSTATEGENERATOR': 'C2EE9ABB',
    'txtUserName': 'admin',
    'txtPSW': '123456',
    'HiddenField1':'', 
    'HiddenField2':'', 
    'UICultureDropDownList': 'ZH-CN',
    'LoginButton':'' 
}
login_in = requests.post(url,headers=headers,data=data)
cookies = login_in.cookies
print(login_in)
print(cookies)

**得到的结果是：

Response [500]

RequestsCookieJar[]

请问这个是什么原因？**

****登入前：****

****登入后：****

可能是请求头不对，你的请求头只有浏览器信息