Tutorials ASP.NET Core Web API Tutorial
ASP.NET Core Out of Process Hosting Model — Complete Guide
ASP.NET Core Out of Process Hosting Model — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of ASP.NET Core Web API Tutorial on Toolliyo Academy.
On this page
ASP.NET Core Web API Tutorial · Lesson 24 of 175
ASP.NET Core Out of Process Hosting Model
Beginner → Intermediate → Advanced → Professional
Beginner · 1 — Setup & foundations · ~6 min · Module 2: Web API Basics
What is this?
Out-of-process hosting runs Kestrel as a separate process. IIS acts as reverse proxy forwarding requests to localhost port.
Why should you care?
Older templates and Linux containers typically use Kestrel directly — same idea as out-of-process behind IIS.
See it live — copy this example
Create a Web API (dotnet new webapi), paste the example, run dotnet run, test in Swagger.
// web.config (published)
<aspNetCore processPath="dotnet" arguments=".\ShopNest.API.dll" hostingModel="OutOfProcess" />Run Example »
This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.
What happened?
- Two processes: IIS + Kestrel.
- Slightly more overhead but isolates crashes and matches container deploys.
Try it yourself
- Read the real-world section and name which part of ShopNest.API uses this topic.
- Run dotnet run and test the endpoint in Swagger UI or curl.
- Change one value in the example (route, DTO field, or status code) and predict what will happen before you save.
- Change a route URL or DTO property and save — test again in Swagger or curl.
- Return the wrong status code on purpose (404 instead of 200) and see what the client shows.
Remember
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
Sign in to ask a question or upvote helpful answers.
No questions yet — be the first to ask!