curl: (56) Received HTTP code 500 from proxy after CONNECT #26

I have this error and I don't know what to do
root@instance-20240320-0133:/home/ubuntu/docker-rotating-proxy# curl https://httpbin.org/ip --proxy http://127.0.0.1:3128
curl: (56) Received HTTP code 500 from proxy after CONNECT

that's how I set the proxies and checked them before:
172.31.22.222:8080
3.75.240.70:53799
3.75.240.70:50825
13.38.176.104:3128
3.9.71.167:3128
54.212.22.168:80
13.125.152.55:8060
3.123.150.192:3128
13.40.239.130:3128
13.38.0.229:55577
3.96.159.76:51805
52.196.1.182:80
44.226.167.102:3128
54.212.22.168:1080
34.215.74.117:3128
18.228.198.164:80
54.233.119.172:3128
65.1.244.232:1080
13.126.184.76:1080
54.186.85.186:10640
65.1.244.232:80