Detect internal redirection

[euskadi31]

Is your feature request related to a problem? Please describe.
Detect internal redirect, ex: / -> /index.html

Describe the solution you'd like
Expose r->internal see: https://github.com/nginxinc/nginx-otel/blob/main/src/http_module.cpp#L312

Describe alternatives you've considered
No alternative founded

Additional context
No more context