[TT-13226] Add XML error handling for application/soap+xml requests

[vanny96]

Branch/Environment/Version

• Branch/Version: Master
• Environment: All

Describe the bug
Currently, Tyk returns a JSON response when a request with Content-Type "application/soap+xml" incurs in an error.

Reproduction steps
Steps to reproduce the behavior:

1. Add api
2. Add basic auth to the api
3. Call api without authorization and with the Content-Type header set to application/soap+xml

Actual behavior
Returns JSON error message

Expected behavior
Returns XML error message

[andyo-tyk]

Hi @vanny96,

Thanks for spotting this and for the contribution. We will review this and aim to implement a fix in the product as soon as we have capacity in a release.

Thanks again.