在标题中指定您的内容类型并使用data=。范例：

import requests

url = "https://httpbin.org/post"
text = "I really like cheese, but I hate it in JSON format!"

r = requests.post(url, headers={"Content-Type": "text/plain"}, data=text)
print(r.text)

回报率：

{
  "args": {}, 
  "data": "I really like cheese, but I hate it in JSON format!", 
  "files": {}, 
  "form": {}, 
  "headers": {
    "Accept": "*/*", 
    "Accept-Encoding": "gzip, deflate, br", 
    "Content-Length": "51", 
    "Content-Type": "text/plain", 
    "Host": "httpbin.org", 
    "User-Agent": "python-requests/2.31.0", 
    "X-Amzn-Trace-Id": "Root=1-65292575-75a3fa092e6553300077b82c"
  }, 
  "origin": "127.0.0.1", 
  "url": "https://httpbin.org/delay/1"
}