As example in the use case
Multiple formats and multilingual site., the
client sends the request:
curl --location --request GET 'www.museum.example.com/artwork/45' \
--header 'Accept: text/html;q=0.9, image/png;q=0.7,image/svg+xml;q=0.8'
And the server answer with the response:
HTTP/1.1 200 OK
Content-Type: text/html
Vary: Accept
Content-Length: 2487 ...