fix(emqx_authn_jwks): add a user-agent header to jwks HTTP request

apps/emqx_auth_jwt/src/emqx_auth_jwt.app.src

@@ -1,7 +1,7 @@
 %% -*- mode: erlang -*-
 {application, emqx_auth_jwt, [
     {description, "EMQX JWT Authentication and Authorization"},
-    {vsn, "0.2.0"},
+    {vsn, "0.2.1"},
     {registered, []},
     {mod, {emqx_auth_jwt_app, []}},
     {applications, [

apps/emqx_auth_jwt/src/emqx_authn_jwks_client.erl

@@ -159,7 +159,10 @@ refresh_jwks(
         case
             httpc:request(
                 get,
-                {Endpoint, [{"Accept", "application/json"}]},
+                {Endpoint, [
+                    {"Accept", "application/json"},
+                    {"User-Agent", "EMQX/" ++ emqx_release:version_with_prefix()}
+                ]},
                 HTTPOpts,
                 [{body_format, binary}, {sync, false}, {receiver, self()}]
             )