sender view [webmention-0001]

According to webmention spec, if someone tries to notify my site that there is a link mentions my post, she has to do the following:

1. curl -I https://dannypsnl.me/xxx to get my webmention endpoint in the head
2. post the data, where is the link refers to my post

   POST /webmention-endpoint HTTP/1.1
   Host: dannypsnl.me
   Content-Type: application/x-www-form-urlencoded
   
   source=
   target=https://dannypsnl.me/xxx