Internet Engineering Task Force (IETF)S. Ludin
Request for Comments: 8586Akamai Technologies
Category: Standards TrackM. Nottingham
ISSN: 2070-1721Fastly
N. Sullivan
April 2019

Loop Detection in Content Delivery Networks (CDNs)


This document defines the CDN-Loop request header field for HTTP. CDN-Loop addresses an operational need that occurs when an HTTP request is intentionally forwarded between Content Delivery Networks (CDNs), but is then accidentally or maliciously re-routed back into the original CDN causing a non-terminating loop. The new header field can be used to identify the error and terminate the loop.