Chx:localonly - Extra Quality

A typical chunk looks like:

Here’s a detailed, technical write-up for — a term that appears in contexts like Apache Chunked Transfer Coding , HTTP/2 , or sometimes in proprietary load balancer / proxy configurations (e.g., F5, HAProxy extensions). Since chx isn’t a standard HTTP header, I’ll interpret it as a custom flag or directive used to enforce local-only processing of chunked data. Understanding chx:localonly – A Deep Dive 1. Origin & Context chx is shorthand for "chunked transfer" or "chunk extension" in HTTP. In the HTTP/1.1 specification (RFC 7230), chunked encoding allows a response body to be sent in pieces. Each chunk can have chunk extensions — optional metadata after the chunk size. chx:localonly

1a;chx:localonly\r\n This is the chunk data\r\n 0\r\n \r\n Here, chx:localonly is a . It’s not standard; it’s used by custom proxies, gateways, or CDNs to signal special handling . 2. Meaning of localonly The localonly value implies that the directive should only be applied by the immediate receiving component (e.g., a reverse proxy, load balancer, or local agent) and not forwarded downstream or to the origin server. A typical chunk looks like: Here’s a detailed,