How do forwarded headers work behind a proxy?
PICTURE THIS: A REST CALL
ClientGET /users/1
ServerFind row
JSON back200 OK
Simple meaning
The proxy sends X-Forwarded-For and Proto
WHY — ASP.NET instead of guessing?
Why interviewers care about ASP.NET:
This is a process
question about ASP.NET.
Panels listen for order,
trade-offs, and what you would actually do on a .NET project - not buzzwords.
Stay structured
Name the idea, why it exists, then one short example.
Close cleanly
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1The proxy sends X-Forwarded-For
and Proto
- 2Why it exists
middleware rewrites the request.
- 3Without it, HTTPS redirects
and client IP logging break.
- 4Give an example
I restrict known proxy networks.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Say this line
“Without it, HTTPS redirects and client IP logging break.”
Break into beats
WithoutitHTTPSredirectsandclient
Speaking order
2987408337471632900
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
The proxy sends X-Forwarded-For and Proto middleware rewrites the request.