502 proxy error

180.183.24.39:3128
217.25.105.38:8080
119.246.66.236:1080
12.25.12.38:80
189.84.123.35:8080
220.15.224.39:8080
189.70.10.243:8080
190.235.43.138:80
24.154.28.35:2797
189.41.92.2:1080
173.50.125.13:1721
94.102.56.158:1193
72.130.17.147:2402
216.230.146.94:1080
123.203.73.249:8090
67.151.77.2:1291
71.91.48.246:2797
67.244.131.60:2797
207.32.49.211:8085
75.69.58.95:2953
75.179.150.55:2797
67.80.87.77:3290
122.166.47.134:8080
217.23.35.178:1080
24.93.187.94:8085
159.224.234.208:8090
98.211.160.222:2797
71.196.53.66:2797