Consider automatically configuring server_fn's server url using the base_path from Dioxus.toml

[david-boles]

Feature Request

At the moment I have to configure it manually:

set_server_url(format!("{}/base_path", get_server_url()).leak());
dioxus_web::launch::launch_cfg(App, dioxus_web::Config::new().hydrate(true));

Not a problem (would be nice if it was documented) but seems like something that could be done automatically.