Customize Tyk Auth Error Response Messages

[sedkis]

Is your feature request related to a problem? Please describe.
As a user of a front-end application, I am frustrated because when not logged in or using the wrong credentials, I don't get enough information in the error response from the API Gateway.

Describe the solution you'd like
As an API Owner, I'd like to be able to customize the error messages that Tyk will send. I'd like to customize both the Body as well as the Headers.

scenario 1)
IE if my Auth field is missing, I want to redirect to my login screen
modify response code: from 401 to 403
and enter a URL redirect

scenario 2)
IE if my AUTH field is missing, I want to change the body from:

{
"error": "Authorization field missing"
}

to:

{
"error": "You're not logged in. Please try again."
}

I'd like to edit this via the Dashboard. I'm not sure if this is best implemented at an API or Global level.

[l3ender]

For scenario 1, it'd be nice to be able to change the response code without adding a redirect.

[sedkis]

I agree - what I would hope to see is full customization =
1 input for response code
1 input for response body
1 input for reponse header

things I don't touch stay default