Host Header - Host Header Picks the Site

The Host header becomes the lookup key for this toy virtual-host table.

highlighted = computed this step

Host is one exact header

The parsed Host value is net.example. The server does not guess it from the path.

\text{Host}=\text{net.example}

The path is /books, while the Host header is net.example.

\text{/books on net.example}

The next chapter compares the Host value against the virtual-host rows.

\text{lookup key}=\text{Host}

The request bytes produce one exact Host value for the server to route.

\text{Host parsed exactly}