Configure User-Agent is relayd HTTP Check ?

[Joel Carnat]

Hi,

Some web applications don’t like when relayd connects to them, for 
health-checks, without providing a User-Agent HTTP header. They return an 
HTTP/418.

So something like
relay "ipv4" {
        listen on www.example.com port 443 tls
        protocol "https"
        forward to <phphosts> port 8080 check http "/health" code 200
}
will not work.

Is there a way to specify a User-Agent value for the check http or shall I 
rather tell relayd to validate on "code 418"?

Thank you,
Joel C.
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