perf(ext/http): cache abort signal error

[littledivy]

Fixes a perf regression introduced in eed2598 (flamegraph)

this patch:

Summary:
  Success rate: 100.00%
  Total:        10.0007 secs
  Slowest:      0.0145 secs
  Fastest:      0.0001 secs
  Average:      0.0006 secs
  Requests/sec: 80341.4816

  Total data:   9.19 MiB
  Size/request: 12
  Size/sec:     941.44 KiB

main:

Summary:
  Success rate: 100.00%
  Total:        10.0007 secs
  Slowest:      0.0068 secs
  Fastest:      0.0002 secs
  Average:      0.0009 secs
  Requests/sec: 56560.0551

  Total data:   6.47 MiB
  Size/request: 12
  Size/sec:     662.75 KiB