Develop Azure Web App Extension to intercept HTTP traffic

Question

Hi, I want to Develop an Azure Web App extension to be able to intercept HTTP traffic so that I can read the request header fields and be able programmatically set custom response headers. This I guess this is similar to how Application Insights, New Relic, Dynatrace and other extensions intercept the traffic.

Answer 1

Thanks for asking question! An extension is basically a web app that runs alongside the regular application and is available in SCM. You may refer to blog for Writing a Site Extension for Azure Websites

If I am understanding right you wants to intercept the pipeline which requires an HttpModule injected into the processing path. This is not an extension.

Adding some information below might be helpful:

This is for ASP.Net on .Net framework.

Overview of HttpModules: IIS Modules Overview | Microsoft Learn

Injecting an HttpModule into the pipeline on Azure: Migrating a static web site using custom HTTP modules to Azure App Service

Sample code for HttpModule: Implement Custom HttpHandler And Custom HttpModule

ASP.Net Core uses middleware. Middleware is injected into the pipeline in the Configure code of the application.

How to migrate HTTP Module to .Net Core: Migrate HTTP handlers and modules to ASP.NET Core middleware

Also, If you could share what is your platform and what is the end goal to this, to help you better on this.

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