```
#QR Code Decoder by sqrtrev
import qrtools
import urllib, httplib

r1 = ''
while '{' not in r1:
urllib.urlretrieve('http://cbmctf2019.cf:3004/img/qr.png','./qr.png')
qr = qrtools.QR(filename="./qr.png")
qr.decode()
conn = httplib.HTTPConnection('cbmctf2019.cf',3004)
conn.request('GET','/check?string='+qr.data)
r1 = conn.getresponse().read()
print r1, qr.data
```