Red Hat OpenStack Platform Key Manager (barbican) error: Request Entity Too Large: Provided information too large to process

Issue

You try to store a secret in Red Hat OpenStack Platform Key Manager (barbican) and receive an error. You see logs similar to the following:

    2021-02-05 20:27:05.824 21 INFO barbican.api.middleware.context [req-47880aae-be19-49b4-b8a0-84e21af202e3 04de045a8afc4b6dac366a30851952ed f8acb70ab0ec4a2eb2922b4bace92b29 - default default]
     Begin processing request req-1fae463e-4afc-4c4f-a1f0-bdc13d875876
    2021-02-05 20:27:05.834 21 ERROR barbican.api [req-69fa7436-40e7-4e38-ad57-b07318d59bab 04de045a8afc4b6dac366a30851952ed f8acb70ab0ec4a2eb2922b4bace92b29 - default default] The request retur
    ned a 413 Request Entity Too Large. This generally means that rate limiting or a quota threshold was breached.: barbican.common.exception.LimitExceeded: The request returned a 413 Request En
    tity Too Large. This generally means that rate limiting or a quota threshold was breached.  
    2021-02-05 20:27:05.834 21 ERROR barbican.api Traceback (most recent call last):                                                                                                            
    2021-02-05 20:27:05.834 21 ERROR barbican.api   File "/usr/lib/python3.6/site-packages/barbican/api/__init__.py", line 70, in load_body
    2021-02-05 20:27:05.834 21 ERROR barbican.api     parsed_body = validator.validate(parsed_body)                                                                                              
    2021-02-05 20:27:05.834 21 ERROR barbican.api   File "/usr/lib/python3.6/site-packages/barbican/common/validators.py", line 209, in validate
    2021-02-05 20:27:05.834 21 ERROR barbican.api     payload = self._extract_payload(json_data)                                                                                                
    2021-02-05 20:27:05.834 21 ERROR barbican.api   File "/usr/lib/python3.6/site-packages/barbican/common/validators.py", line 319, in _extract_payload
    2021-02-05 20:27:05.834 21 ERROR barbican.api     raise exception.LimitExceeded()                                                                                                            
    2021-02-05 20:27:05.834 21 ERROR barbican.api barbican.common.exception.LimitExceeded: The request returned a 413 Request Entity Too Large. This generally means that rate limiting or a quota
     threshold was breached.                                                                                                                                                                    
    2021-02-05 20:27:05.834 21 ERROR barbican.api                                                                                                                                                
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers [req-69fa7436-40e7-4e38-ad57-b07318d59bab 04de045a8afc4b6dac366a30851952ed f8acb70ab0ec4a2eb2922b4bace92b29 - default default] Webob
     error seen: webob.exc.HTTPRequestEntityTooLarge: Provided information too large to process                                                                                                  
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers Traceback (most recent call last):                                                                                                
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/barbican/api/__init__.py", line 70, in load_body                                          
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     parsed_body = validator.validate(parsed_body)                                                                                  
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/barbican/common/validators.py", line 209, in validate                                    
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     payload = self._extract_payload(json_data)                                                                                    
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/barbican/common/validators.py", line 319, in _extract_payload
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     raise exception.LimitExceeded()                                                                                                
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers barbican.common.exception.LimitExceeded: The request returned a 413 Request Entity Too Large. This generally means that rate limitin
    g or a quota threshold was breached.                                            
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers                                    
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers During handling of the above exception, another exception occurred:
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers Traceback (most recent call last):
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/barbican/api/controllers/__init__.py", line 101, in handler
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     return fn(inst, *args, **kwargs)
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/barbican/api/controllers/__init__.py", line 87, in enforcer
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     return fn(inst, *args, **kwargs)
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/barbican/api/controllers/__init__.py", line 149, in content_types_enforcer
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     return fn(inst, *args, **kwargs)
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/barbican/api/controllers/secrets.py", line 443, in on_post
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     data = api.load_body(pecan.request, validator=self.validator)
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/barbican/api/__init__.py", line 73, in load_body
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     pecan.abort(e.status_code, e.client_message)
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/pecan/core.py", line 135, in abort
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     raise webob_exception.with_traceback(traceback)
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/barbican/api/__init__.py", line 70, in load_body
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     parsed_body = validator.validate(parsed_body)
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/barbican/common/validators.py", line 209, in validate
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     payload = self._extract_payload(json_data)
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers   File "/usr/lib/python3.6/site-packages/barbican/common/validators.py", line 319, in _extract_payload
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers     raise exception.LimitExceeded()
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers webob.exc.HTTPRequestEntityTooLarge: Provided information too large to process
    2021-02-05 20:27:05.835 21 ERROR barbican.api.controllers
    2021-02-05 20:27:05.836 21 INFO barbican.api.middleware.context [req-69fa7436-40e7-4e38-ad57-b07318d59bab 04de045a8afc4b6dac366a30851952ed f8acb70ab0ec4a2eb2922b4bace92b29 - default default]
     Processed request: 413 Request Entity Too Large - POST http://192.168.24.100:9311/v1/secrets