Reverse Proxy Cheatsheet as a Request-Response Sequence Diagram

Trying to understand what headers and bodies the requests and responses between client, reverse proxy and backend actually contain.

Getting Host, Port and Scheme right

Setting the Host header and being verbose:

curl -vH "Host: example.com" http://localhost/

To also test HTTPS (using SNI) – an alternative to a local /etc/hosts entry:

curl -v --resolve example.com:443:127.0.0.1 https://example.com