diff --git a/config.js.example b/config.js.example
index f07857d..0c383e8 100644
--- a/config.js.example
+++ b/config.js.example
@@ -142,6 +142,7 @@ module.exports = {
     "description": "Nostr relay bouncer",
     "name": "Bostr",
     "software": "git+https://github.com/Yonle/bostr",
+    "canonical_url": "wss://bostr.example.com",
 
     // Some nostr client may read the following for compatibility check.
     // You may change the supported_nips to match with what your relays supported.
diff --git a/http.js b/http.js
index f5e916d..287722c 100644
--- a/http.js
+++ b/http.js
@@ -22,12 +22,18 @@ let wslinkregex = /(?:^- )(wss?:\/\/.*)(?: \(.*\))/gm;
 let loadbalancerUpstreamLinks = [];
 
 config.server_meta.version = version;
+config.server_meta.limitation = {
+  auth_required: false
+};
+
+if (config.server_meta.loadbalancer?.length || config.authorized_keys?.length)
+  config.server_meta.limitation.auth_required = true;
 
 if (!config.relays?.length) (async () => {
   console.log("Load balancer mode. Fetching relays list from", config.loadbalancer[0].replace(/^ws/, "http"));
   const request = await undici.request(config.loadbalancer[0].replace(/^ws/, "http"), {
     headers: {
-      "User-Agent": `Bostr ${version}; The nostr relay bouncer; https://github.com/Yonle/bostr`
+      "User-Agent": `Bostr ${version}; The nostr relay bouncer; https://github.com/Yonle/bostr; ${config.server_meta.canonical_url || "No canonical bouncer URL specified"}; Contact: ${config.server_meta.contact}`
     }
   });
 
diff --git a/worker_bouncer.js b/worker_bouncer.js
index 45ac29d..bb365a1 100644
--- a/worker_bouncer.js
+++ b/worker_bouncer.js
@@ -7,7 +7,7 @@ const WebSocket = require("ws");
 const { validateEvent, nip19, matchFilters, mergeFilters, getFilterLimit } = require("nostr-tools");
 const nip42 = require("./nip42.js");
 
-let { relays, log_about_relays, private_keys, reconnect_time, wait_eose, pause_on_limit, max_eose_score, upstream_ratelimit_expiration, max_client_subs, idle_sessions, cache_relays, loadbalancer, max_known_events } = require(process.env.BOSTR_CONFIG_PATH || "./config");
+let { relays, log_about_relays, server_meta, private_keys, reconnect_time, wait_eose, pause_on_limit, max_eose_score, upstream_ratelimit_expiration, max_client_subs, idle_sessions, cache_relays, loadbalancer, max_known_events } = require(process.env.BOSTR_CONFIG_PATH || "./config");
 
 log_about_relays = process.env.LOG_ABOUT_RELAYS || log_about_relays;
 
@@ -280,7 +280,7 @@ function newConn(addr, id, reconn_t = 0) {
   if (!stats[addr]) stats[addr] = { raw_rx: 0, rx: 0, tx: 0, f: 0 };
   const relay = new WebSocket(addr, {
     headers: {
-      "User-Agent": `Bostr ${version}; The nostr relay bouncer; https://github.com/Yonle/bostr`,
+      "User-Agent": `Bostr ${version}; The nostr relay bouncer; https://github.com/Yonle/bostr; ${server_meta.canonical_url || "No canonical bouncer URL specified"}; Contact: ${server_meta.contact}`,
     }
   });