Rack::Timeout::RequestTimeoutException

I try to get user info via REST API, that return the followinf exception:

2019-07-04T12:19:21.70971 Started GET "/api-umbrella/v1/users/37fe58cc-8efc-4545-85fd-86e02a739408" for 127.0.0.1 at 2019-07-04 12:19:21 +0000
2019-07-04T12:19:21.71090 Processing by Api::V1::UsersController#show as JSON
2019-07-04T12:19:21.71093   Parameters: {"id"=>"37fe58cc-8efc-4545-85fd-86e02a739408", "user"=>{}}
2019-07-04T12:19:51.70928 source=rack-timeout id=4eb606b414551abef0c826d674774031 timeout=30000ms service=30000ms state=timed_out at=error
2019-07-04T12:19:51.70994 Completed 500 Internal Server Error in 29999ms
2019-07-04T12:19:51.71133
2019-07-04T12:19:51.71136 Rack::Timeout::RequestTimeoutException (Request ran for longer than 30000ms):
2019-07-04T12:19:51.71136   app/controllers/application_controller.rb:125:in authenticate_admin_from_token!
2019-07-04T12:19:51.71137   app/controllers/application_controller.rb:160:in set_userstamp
2019-07-04T12:19:51.71137   app/controllers/application_controller.rb:88:in block in use_locale
2019-07-04T12:19:51.71141   app/controllers/application_controller.rb:87:in use_locale

But i try to get the info from webui, that is work

2019-07-04T12:23:44.19671 Started GET "/api-umbrella/v1/users/37fe58cc-8efc-4545-85fd-86e02a739408" for 127.0.0.1 at 2019-07-04 12:23:44 +0000
2019-07-04T12:23:44.19809 Processing by Api::V1::UsersController#show as JSON
2019-07-04T12:23:44.19812   Parameters: {"id"=>"37fe58cc-8efc-4545-85fd-86e02a739408"}
2019-07-04T12:23:44.21360   Rendered api/v1/users/show.rabl (6.5ms)
2019-07-04T12:23:44.21391 Completed 200 OK in 16ms (Views: 7.2ms)

Start with app/controllers/application_controller.rb, particularly authenticate_admin_from_token!, set_userstamp, and use_locale, then compare the two request traces and their differing parameters. The issue names no test or expected code change; done would require identifying why the API request exceeds the 30-second timeout and confirming a resolution.