Is it possible to inject a custom request header in the request header of my service using Application Gateway Rewrites?

Question

How can I add a custom request header using Application Gateway Rewrites? I want to inject the header in the request header of my service. I tried adding a request header with a custom value, but it wasn't visible in the request info, whereas a response header worked. We are currently using an nginx service that runs inside a VM as the backend pool. Can anyone provide any assistance on how to accomplish this?

We could not find in this Request header.

Answer 1

Hello @Ranjithukumar ,

Thanks for reaching out to Microsoft Q and A platform.

Could you please provide the information on where do you see that the request header not seen?

The request header is set post Application Gateway forward the request to the backend VM's.

Could you please take a fiddler behind the VM, to find out the request header? The response would be seen on the Client machine. But changes to the Request Header would be seen behind the application gateway.

Any application-level logs would also help to track the Http request.

https://learn.microsoft.com/en-us/azure/application-gateway/rewrite-http-headers-url#rewrite-actions

Regards, Priya Kumar