Sets the URI query required to access a resource on a WebDAV server.
This is typically used when the resource_path points not to the resource itself but to a web program that generates the resource content on-the-fly. The resource_query holds the input values for the program.
The internal copy of resource_query is automatically stripped of leading and trailing whitespace. If the resulting string is
empty, null is set instead.
| this |
an SourceWebdav |
| resource_query |
the query to access a WebDAV resource, or |