Comment by max_k

> imply that HTTP and FastCGI are interchangeable and they are not.

But they are interchangeable!

FastCGI and HTTP/1.1 are indeed on the same level. Both are transport protocols for HTTP requests.

It would be technically possible to implement FastCGI as alternate transport protocols in browsers and web servers, just like HTTP/2 (SPDY) and HTTP/3 (QUIC) are alternate transport protocols for HTTP requests.

(This is not what the article and my comment are about, as others already pointed out.)