I can only explain it, that my web server can't handle all the requests/s and timeout. I see some timeouts in the result of bombardier:
Bombarding 127.0.0.1 with 5000000 request(s) using 50 connection(s)
5000000 / 5000000 [==================================================================================================================================================================================================================================================================================] 100.00% 106194/s 47s
Done!
Statistics Avg Stdev Max
Reqs/sec 106292.69 44491.73 224577.53
Latency 393.78us 91.33ms 33.91s
Latency Distribution
50% 43.00us
75% 63.00us
90% 103.00us
95% 170.00us
99% 642.00us
HTTP codes:
1xx - 0, 2xx - 4999962, 3xx - 0, 4xx - 0, 5xx - 0
others - 38
Errors:
dial tcp 127.0.0.1:6767: connect: operation timed out - 38
Throughput: 21.90MB/s