发出GET请求以获取验证码，然后发出POST请求以发布响应是否会更改原始的验证码？

Question

我正在尝试使用python请求登录。我提出GET请求并获取验证码。我解决了验证码，然后提出了带有必要有效负载的POST请求。但是验证码已更改（或没有更改？），所以我的回答不正确。我正在使用会话，但即使这样也不起作用。任何建议/帮助表示赞赏。

    session = requests.session()
    prox = {'http':'socks5h://localhost:9050',
            'https': 'socks5h://localhost:9050'}
    session.proxies = prox
    em_url = 'http://b4lzbnzx55o7d6yutrhrbgku35fl3hy6r7eyx7veorw6qwih27covjid.onion/'
    response = session.get(f'{em_url}')
    doc = BeautifulSoup(response.text, 'lxml')

    form = doc.find('form').find_all('div')


    name = form[0].find('input')['name']
    pswd = form[1].find('input')['name']
    img = form[3].find('img')['src']
    cap = form[4].find('input')['name']

    print(img, '\n\n') # I get the url of the captcha
    cap_ans = input() # Giving captcha's output manually for testing

    payload = {
        name:'myUsername',
        pswd:'myPassword',
        cap:cap_ans,
    }


    login_wrap = form[5].find_all('input')
    hid_data = []
    for x in login_wrap:   # There are some hidden inputs too
        payload[x['name']] = x['value']


    resp = session.post(f'{em_url}', data=payload)
    print('status', resp.status_code)
    print(resp.text) # I should be logged in now, but that doesn't happen and i get an invalid captha error