BlessProxy

HTTP vs SOCKS5 Proxies: Differences and Use Cases

How HTTP and SOCKS5 proxies work, what CONNECT does, which one supports UDP and DNS through the proxy, and how to choose for your tool.

· 2 min read

Both HTTP and SOCKS5 proxies relay your traffic through another IP address, but they work at different levels. The choice affects which applications you can use, whether UDP works and where DNS is resolved.

How an HTTP proxy works

An HTTP proxy speaks HTTP with your client:

  • For plain http:// URLs the client sends the full request to the proxy (GET http://example.com/ HTTP/1.1) and the proxy fetches it.
  • For https:// URLs the client sends CONNECT example.com:443, the proxy opens a TCP tunnel, and the TLS session runs end-to-end through it. The proxy does not see the decrypted content.

Authentication uses the Proxy-Authorization header (usually Basic: login and password).

How a SOCKS5 proxy works

SOCKS5 (RFC 1928) is protocol-agnostic. After a short handshake — with username/password authentication from RFC 1929 — the client asks the proxy to connect to a host and port, and then any bytes flow through: HTTP, SMTP, a database protocol or a game.

SOCKS5 also defines UDP ASSOCIATE for relaying UDP datagrams, if the proxy server supports it.

Comparison

HTTP proxy SOCKS5 proxy
Protocols HTTP and HTTPS (via CONNECT) Any TCP; UDP if supported
DNS Resolved by the proxy By the client (socks5) or the proxy (socks5h)
Typical support Browsers, almost every HTTP library Browsers, curl, most libraries via plugins
Authentication Proxy-Authorization header Username/password sub-negotiation

Which one to use

  • Web scraping and API calls: either works. HTTP proxies need no extra packages in most libraries; SOCKS5 needs e.g. requests[socks] or httpx[socks] in Python.
  • Non-HTTP protocols (mail, databases, messengers): SOCKS5.
  • UDP (QUIC, DNS, VoIP, games): SOCKS5 with UDP support — see UDP proxies.
  • Avoiding DNS leaks: HTTP proxies and socks5h:// resolve names on the proxy side.

Quick test with curl

# HTTP proxy
curl -x http://LOGIN:PASSWORD@HOST:PORT https://api.ipify.org

# SOCKS5, DNS resolved by the proxy
curl -x socks5h://LOGIN:PASSWORD@HOST:PORT https://api.ipify.org

Both commands print the exit IP of the proxy. On BlessProxy, mobile 4G/5G ports accept both HTTP and SOCKS5; static IPs from the catalog work over SOCKS5.