> For fun, let’s inspect history.com and see what the heck all those headers are. I don't know for sure, but those seem like they might be response headers fro

> For fun, let’s inspect history.com and see what the heck all those headers are. I don't know for sure, but those seem like they might be response headers from app servers meant to be picked up on the way out by proxy servers for the purposes of analytics, or possibly for applying caching rules. Normally you'd have the proxy strip these out before sending back to the end user.