URL in Path

[pascal_baehler]

Hi
We have a product which is checking if a weburl is secure or not.
To do that, we call apigee like this:
..../layer/security/phisherman/urls/https%3A%2F%2Fswisspost.page57292.cfd
This always results in a 404 error and is not even reaching the API itself. When I delete one of the %2F, then it reach the API. I assume, if there are 2 / in the request URL, this is not working.
As the attached backend needs this 2 / (url encoded), we need to forward this somehow.
Any hint how we can achieve this?

That's how basepath is configured:
<HTTPProxyConnection>
  <BasePath>/layer/security/phisherman</BasePath>
  <VirtualHost>default</VirtualHost>
</HTTPProxyConnection>

Thanks,
Pascal