[FIX] service.server: drop idle connection attempts
[FIX] service.server: drop idle connection attempts

Avoid wasting HTTP workers (in prefork server mode)
for pending/idle connections.
HTTP connections that have not sent anything for 500ms
will be dropped.

In particular, wkhtmltopdf uses a connection pool
to load remote resources. It opens more HTTP connections
than necessary and uses a random subset of them, leaving
the other idle.

On a server that has little available workers this
may significantly delay report rendering, and could
even lead to a deadlock.

OPW-667870

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