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A Primer on Proxies

Blog post from Cloudflare

Post Details
Company
Date Published
Author
Lucas Pardue, Christopher Wood
Word Count
2,205
Company Posts That Month
63
Language
English
Hacker News Points
142
Post removed?
No
Summary

Traffic proxying is a valuable privacy tool that encapsulates one flow of data inside another, helping establish boundaries on the internet. MASQUE is a collaboration effort to design efficient proxy protocols based on IETF standards. Forward proxying involves a client establishing an end-to-end tunnel to a target server via a proxy server. TCP provides a reliable byte stream for applications like HTTP and TLS, while various proxy protocols are used for proxying TCP end-to-end, including SOCKS, Transparent TCP proxies, Layer 4 proxies, and HTTP CONNECT. The IETF chose to focus on using HTTP as a substrate via the CONNECT method, which supports different versions of HTTP like HTTP/1.1, HTTP/2, and HTTP/3. QUIC is a new secure and multiplexed transport protocol that provides reliable and ordered streams for applications like HTTP/3. Moving forward, the MASQUE Working Group aims to standardize technologies enabling proxying for datagram-based protocols like UDP and IP.

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