import requests
import json

domain = "https://mydomain.com"
useragent = 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0)'
s = requests.Session()

url = 'https://sitereview.bluecoat.com/resource/lookup'
postData = {'url': domain, 'captcha': ''}
headers = {'User-Agent': useragent,
           'Accept': 'application/json, text/plain, */*',
           'Content-Type': 'application/json; charset=UTF-8',
           'Referer': 'https://sitereview.bluecoat.com/lookup'}

response = s.post(url, headers=headers, json=postData, verify=False)

responseJSON = json.loads(response.text)

print(responseJSON)