When I read the document:
When the client next requests the same resource, it might send along a header such as either
If-modified-since
orIf-unmodified-since
, containing the date of the last modification time it was sent.
I saw there are send along
here, I know its meaning. but you know, we can use send
directly, why there is more – an along
here?
What's the difference between send along
and send
?