receiving {HEAD ~ a request} to write {TAIL ~ the predetermined data} to a page to which data has been written 
to write
receiving { HEAD ~ a request } to write { TAIL ~ the predetermined data } to a page to which data has been written
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH