Improved HTTP client (#4740)

* Improved HTTP client

* Change config compat to use auto, rename blacklist

* Fix wrong doc references

src/api/mod.rs

@@ -20,7 +20,7 @@ pub use crate::api::{
     core::two_factor::send_incomplete_2fa_notifications,
     core::{emergency_notification_reminder_job, emergency_request_timeout_job},
     core::{event_cleanup_job, events_routes as core_events_routes},
-    icons::{is_domain_blacklisted, routes as icons_routes},
+    icons::routes as icons_routes,
     identity::routes as identity_routes,
     notifications::routes as notifications_routes,
     notifications::{AnonymousNotify, Notify, UpdateType, WS_ANONYMOUS_SUBSCRIPTIONS, WS_USERS},