Set up URL rewrite for Linux based Azure App Service

Question

Hi,
We are trying to configure URL rewrite for our application that is hosted on Azure App Services, however we cannot get it to work. At this moment, even simple test rewrite rules don't seem to be working.
For example:
It's a .net 6 application hosted on Linux-based App Service.
Could you please let me know, what are the steps required to enable rewrite for Linux-based App service applications?
Let me know if any additional information is needed.
Thank you.
Tena

Answer 1

you are configuring IIS re-write rules. as linux based app services do not use IIS, they have no effect (in fact web.config is ignored).

typically with linux, you would use ngnix to perform this feature.

https://www.nginx.com/blog/securing-applications-microsoft-azure-app-service-nginx-plus/

Answer 2

Hi @Tenanana-7634

ajkuma-MSFT 's comment is useful. I'll summarize and add a little bit about the way to achieve this requirement using the web server configuration file.

Because asp.net core is cross-platform, it is most convenient to use middleware to implement url rewrite, and it is also convenient to deploy.
But if you know the type of web server, that's also achievable. When we create an azure web app, use F12 to check the information of the webserver, and then choose to add the corresponding file.

Different servers use different configuration file types as follows:

IIS : using web.con fig
Nginx : using .conf
Apache : using .htac cess

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Best regards,
Jason

Answer 3

@Tenanana-7634 , Apologies for the delay from over the weekend.
Azure App Service on Linux images are now bundled with NGINX instead of Apache.

There are couple of approaches to handle a Rewrite operation: in app middleware and URL Rewriting Middleware in ASP.NET Core in the code.
Kindly check this discussion thread.

Also, checkout this doc Host ASP.NET Core on Linux with Nginx for more details.

sample-webconfig.txt

-After to incorporate the changes, you may try to isolate, see if it works locally fine.
-I have also added additional tags to receive insights from the targetted SMEs.