The TrackBack provides a method of notification between
websites: it is a method of person A saying to person B, "This is
something you may be interested in." To do that, person A sends a
TrackBack ping to person B. TrackBack ping call: this is a small
message sent from one webserver to another via HTTP POST or GET.
There are few situations where track back is useful: *As a form of
remote comments rather than posting the comment directly on person
B's weblog, person A posts it on his own weblog, then sends a
TrackBack ping to notify person B. *Person A has written a post
that group of people are interested in; then it sends a trackback
to a community server and there visitors can show it.
The implementation consist of : * the "trackback" method which
can be invoked via REST(HTTP POST) * auto-discovery of the
trackback URL in default blog home page
trackback (varchar id, varchar url, varchar title, varchar
excerpt, varchar blog_name, varchar __mode) the method can be
invoked via REST and returns a XML response.
A typical trackback post request look-like as :