HTTP OPTIONS Method in ASP.NET Core Web API — Complete Guide

HTTP OPTIONS Method in ASP.NET Core Web API — 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.

8 min read Updated 8/9/2026

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ASP.NET Core Web API Tutorial · Lesson 102 of 175

HTTP OPTIONS Method in ASP.NET Core Web API

Beginner ✓ → Intermediate ✓ → Advanced → Professional

Advanced · 3 — Security & patterns · ~10 min · Module 8: HTTP Methods

What is this?

HTTP OPTIONS Method in ASP.NET Core Web API uses the right HTTP verb for each ShopNest.API action — safe reads vs creates vs updates vs deletes.

Why should you care?

REST clients and caches assume GET is safe and DELETE is idempotent — wrong verb breaks tooling.

See it live — copy this example

Create a Web API (dotnet new webapi), paste the example, run dotnet run, test in Swagger.

[HttpGet] public Task<List<ProductDto>> List();
[HttpPost] public Task<ProductDto> Create(CreateProductDto dto);
[HttpPut("{id}")] public Task Update(int id, UpdateProductDto dto);

Run Example »

Edit the code and click Run — like W3Schools Try it Yourself.

Code

Result

What happened?

Study the example, run dotnet run, and test in Swagger.
HTTP OPTIONS Method in ASP.NET Core Web API connects to earlier modules in this course.

Try it yourself

Read what HTTP OPTIONS Method in ASP.NET Core Web API means for ShopNest.API.
Type the example — do not only copy-paste.
Test in Swagger or Postman.
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

You understand HTTP OPTIONS Method in ASP.NET Core Web API in plain language. You traced or ran working C# in ShopNest.API. Move on when you can teach this topic to a friend.