The server compares the validator with the current resource tag.
The validator matches the current tag
The decision rows compare the request validator with the current resource tag.
validator equals current tag
The match row says yes
Because the tags match, the server can say the cached copy is still current.
match=yes
The body length changes to zero sent bytes
The resource body length is 1280, but sent body length is 0.
Summary
A matching validator lets the server skip the body.
body skipped