https://51.81.220.198/1GB.txt
https://51.81.220.198/1MB.txt
https://51.81.220.198/2MB.txt
https://51.81.220.198/5MB.txt
https://51.81.220.198/10MB.txt
https://51.81.220.198/50MB.txt
https://51.81.220.198/100KB.txt
https://51.81.220.198/100MB.txt
https://51.81.220.198/200KB.txt
https://51.81.220.198/200MB.txt
https://51.81.220.198/600MB.txt
https://51.81.220.198/800MB.txt