Thursday, May 18, 2017

Improve performance of your ASP.NET Core application

ASP.NET Core is running on Kestrel, ASP.NET Core’s internal web server. Although really fast Kestrel is not a full blown web server. The idea is that you put another web server(on Windows typically IIS) in front of it that acts as a proxy and forwards the requests to Kestrel.

To get this working in IIS, an AspNetCoreModule exists that achieves this goal. Here is the web.config that configures all of this:

If you look at the configuration, you see that by default all request(path="*" verb="*") are forwarded to Kestrel. This isn't ideal because Kestrel is a lot slower in handling static files than IIS.

A better solution is to only forward the requests that should be handled by ASP.NET Core(by example; path="api/*" verb="*") and let other requests be served by IIS.

The magic trick is to use IIS URL Rewrite rules to forward requests to the wwwroot folder of your ASP.NET Core app:

UPDATE: Rick Strahl did a more complete blog post where he took this approach a few steps further:


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Anonymous said...

Microsoft currently does not support machine to machine communication for Kestrel. When ASP.NET Core 2.0(Q3 2017) is released they will support it but not recommend it.