Description of problem:

Error: Request failed with status code 422 if you miss adding HTTP or HTTPS before proxy IP or hostname 

Oh no! Something went wrong while submitting the form, the server returned the following error: Error: Request failed with status code 422


Version-Release number of selected component (if applicable):
satellite-6.9 Beta


How reproducible:
New installation

Steps to Reproduce:
1. Go to Administer --> Settings --> General 
2. Update "HTTP(S) proxy without HTTP:// or https://
3. 

Actual results:

Oh no! Something went wrong while submitting the form, the server returned the following error: Error: Request failed with status code 422

==> /var/log/foreman/production.log <==
2021-01-23T22:52:15 [I|app|9072d123] Started PUT "/api/settings/92" for 127.0.0.1 at 2021-01-23 22:52:15 +0530
2021-01-23T22:52:15 [I|app|9072d123] Processing by Api::V2::SettingsController#update as JSON
2021-01-23T22:52:15 [I|app|9072d123]   Parameters: {"setting"=>{"value"=>"[FILTERED]"}, "apiv"=>"v2", "id"=>"92"}
2021-01-23T22:52:15 [E|app|9072d123] Unprocessable entity Setting::General (id: 92):
 9072d123 |   Not a valid URL for a HTTP Proxy
 9072d123 | 
2021-01-23T22:52:15 [I|app|9072d123]   Rendering api/v2/errors/unprocessable_entity.json.rabl within api/v2/layouts/error_layout
2021-01-23T22:52:15 [I|app|9072d123]   Rendered api/v2/errors/unprocessable_entity.json.rabl within api/v2/layouts/error_layout (Duration: 5.8ms | Allocations: 6602)
2021-01-23T22:52:15 [I|app|9072d123] Completed 422 Unprocessable Entity in 24ms (Views: 10.1ms | ActiveRecord: 2.2ms | Allocations: 17527)



Expected results:

Please print/show user-friendly error like  "Not a valid URL for a HTTP Proxy" instead of current {Oh no! Something went wrong while submitting the form, the server returned the following error: Error: Request failed with status code 422}

Additional info:

Any example on the popup would be helpful to understand the requirement, who are new to satellite