For example, web servers continue to request {HEAD ~ operations} on {TAIL ~ the database} while content is being moved 
on
For example , web servers continue to request { HEAD ~ operations } on { TAIL ~ the database } while content is being moved
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH