Haproxy errorfile + keepalive?

@vikas wrote:

We occasionally use haproxy to return a static API response (using the errorfile directive).
However, we’ve noticed that when we do so, haproxy closes the connection (instead of respecting the Connection: Keep-Alive header).

Is there any way to get haproxy to keep the connection alive, instead of closing it right away?

I’ve tried various permuations of setting option http-keep-alive, option httpclose, forcepersist, to no avail. We use haproxy 1.8.

Here’s the backend configuration:

### backend for blackholing heartbeats
backend mybackend
  mode http
  errorfile 503 /srv/www/response.http

Here are the contents of the errorfile:

HTTP/1.1 200 Ok
Content-Type: application/json; charset=utf-8
Connection: Keep-Alive
Content-Length: 17

{"success":false}

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