[docs] dnsdist webserver parameters are global

[stirnim]

• Program: dnsdist
• Issue type: Bug report

Short description

webserver parameters (password, apikey, custom headers, acl) are global to all webserver instances.
This behaviour is not expected when reading the documentation https://dnsdist.org/reference/config.html#webserver-configuration. It would be useful if the documentation could state this behaviour.

Environment

• Operating system: CentOS 7.6
• Software version: dnsdist 1.5.0-rc4
• Software source: compiled myself

Steps to reproduce

The following configuration sets different ACLs per webserver instance. However, as the parameters are globally applied "::/0" is cleared.

webserver("[2001:620:0:1006:21a:4aff:fede:ee3d]:8853","supersecret", "", {}, "::/0")
webserver("[::1]:8853","supersecret", "", {}, "127.0.0.1, ::1")

Expected behaviour

Either apply webserver parameters per webserver instance or state in the documentation that parameters (password, apikey, custom headers, acl) are global to all webserver instances. For example:

All webserver parameters except listen_address are global to all webserver instances.

[rgacogne]

Setting a 1.5.0 milestone to fix the documentation, and we should make these parameters per-instance in 1.6.0.