import os
from gcore import Gcore

client = Gcore(
    api_key=os.environ.get("GCORE_API_KEY"),  # This is the default and can be omitted
)
client.waap.domains.custom_rules.update(
    rule_id=0,
    domain_id=1,
)

{
  "type": "http-bad-request",
  "title": "Bad Request",
  "status": 400,
  "detail": "Invalid domain name: ''''"
}