Azure Function App remove headers set by a Nest.js App

[GSManganneau]

Hello everyone,
Thanks for the time reading this.

I am developing an App using Nest.js framework, running it on Azure App service.

I am using a library which set some headers before sending the response to the client.
When I run my code on local runtime, everything seems working properly.
But, when I use Azure Function App local runtime, headers seems to disappear.

There is a screenshot of the request using local runtime

As you can see in the “Response Headers” section there some headers set.

And then a screenshot of the same server code running on Azure Function App local runtime

As you can see in the “Response Headers” section some headers are missing.

My question is, how do I configure Azure Function App so that it does not remove headers set by my Nest.js App ?

I’ve been looking into MS documentation about that, but I did not find anything.

Thank you for your help