Mailgun API Create Route

example.py

# Example from Mailgun: https://documentation.mailgun.com/docs/mailgun/api-reference/openapi-final/tag/Routes/#tag/Routes/operation/post-v3-routes
import requests

url = "https://api.mailgun.net/v3/routes"

data = {
  "priority": "0",
  "description": "it's a new route",
  "expression": "match_recipient('.*@gmail.com')",
  "action[0]": "forward("http://myhost.com/messages/")"
}

headers = {"Content-Type": "multipart/form-data"}

response = requests.post(url, data=data, headers=headers, auth=('<username>','<password>'))

data = response.json()
print(data)

# This example from Mailgun above will not work. 

#Priority should be 0 or another int.
"priority": 0
  
# Expression is wrong. quotes are wack. It should be like this.
"expression": f'match_recipient("{recipient_address}")'

# Action is wrong. It should be a list.
"action": [f'forward("{forward_address}")']  # Action should be a list
    }
    
# Headers is the wrong content type. It should be as below.
headers = {"Content-Type": "application/x-www-form-urlencoded"}

I was working with the API from Mailgun. Their own documented examples don't work. So I explain here what to fix.