Protocols
Every detail at the protocol layer, from HTTP absolute-URI requests to CONNECT tunnels, from TLS validation to the WebSocket upgrade.
The HTTP Proxy Caching Mechanism
What is proxy caching, and which content gets stored?
Proxy Protocol Selection Guide
How do you choose between HTTP, HTTPS, SOCKS4 and SOCKS5?
Email Protocols and Proxy
How do SMTP, IMAP and POP3 traffic pass through a proxy?
WebSocket and Proxy
Do WebSocket connections work through a proxy?
Keep-Alive and Connection Pooling in Proxies
How does connection reuse affect proxy performance?
Proxy and TLS Certificate Validation
Why do certificate errors appear when connecting through a proxy?
The HTTP CONNECT Method and HTTPS Tunneling
How does the CONNECT method work, and what can a proxy see in HTTPS traffic?
What Is an HTTPS Proxy?
"HTTPS proxy" means two different things: a proxy that carries HTTPS traffic, and a proxy whose own connection is encrypted.
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Put Protocols into practice
Test with the free proxy list, then move to a plan as your needs grow.