Bad request(400) error!

[manhsv]

I try to add Vietnamese accent by using API on this :link((on API: Add Accents) but bad request(400).

import requests
url = "http://api.openfpt.vn/vnaccent/add"

headers = {
    
    'api_key': "5268c1bfd9da46c996d50649b23b59f5",
    'Cache-Control': "no-cache"
    }


response = requests.request("-X GET",url,headers=headers)

print(response.text)

I'm a beginner to this.