-> A single connection:
-> This is ApacheBench, Version 1.3c <$Revision: 1.41 $> apache-1.3
-> Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
-> Copyright (c) 1998-1999 The Apache Group, http://www.apache.org/
->
-> Server Software:        Apache/1.3.22
-> Server Port:            80
->
-> Document Path:          /simple/
-> Document Length:        201 bytes
->
-> Concurrency Level:      1
-> Time taken for tests:   0.697 seconds
-> Complete requests:      1000
-> Failed requests:        0
-> Non-2xx responses:      1000

                           ^^^^

Doesn't this mean that your server wasn't returning "OK"?

cheers,
--titus