Why does enabling abortonclose result in an uptick of hrsp_5xx?

@mchesler wrote:

We’re looking to enable option abortonclose so that our application behind HAProxy can see when a client aborts a connection. Turning the option on worked fine, but we noticed that it resulted in a definite jump in hrsp_5xx counters. From the application’s perspective, the responses still seem to result in 200s. Why is HAProxy logging 5xx responses? Is there something else we can adjust to stop this from happening? We monitor the occurrence of 5xx response as an indicator of backend health, so we can’t simply ignore it. I’ve confirmed that removing the options eliminates the 5xx counter increments.

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