Forward port r70643 (#5542) + part of r83120 (just remove the comment)

Forward port r70643 (#5542) + part of r83120 (just remove the comment)

Remove special logic that closes HTTPConnection socket on EPIPE.

If the socket is closed, the client has no chance to read the response
from the server.  EPIPE means that it isn't possible to write more
data from the socket, but not that it is impossible to read.