1. That blog is written by someone who does not know what HTTP request and response headers are.
2. The solution provided does not solve the problem of foo.com not trusting bar.foo.com.
2. The solution provided does not solve the problem of foo.com not trusting bar.foo.com.
2. The post was written in an exploratory tone, not a factual, "here are the facts, here's how to solve this problem across all scenarios" tone.
Thanks for your feedback.