ASP.NET Core 2.2 WebAPI 405 Method Not Allowed

Setup

• Windows 10
• Visual Studio 2017 Professional
• ASP.Net Core 2.2

What I'm trying to do

Run an Integration Test against a controller method in my Web API that uses a PATCH verb

MyController.cs

namespace FluidIT.API.Controllers { [Route("api/v1/[controller]")] [ApiController] public class MyController : ControllerBase { private readonly IMediator _mediator; private readonly IMyQueries _myQueries; public JobsController(IMediator mediator, IMyQueries myQueries) { _mediator = mediator ?? throw new ArgumentNullException(nameof(mediator)); _myQueries = myQueries ?? throw new ArgumentNullException(nameof(myQueries)); } // PATCH: api/v1/my/{id} [Route("id:int")] [HttpPatch] public async Task<IActionResult> RemoveMeAsync(int id) { bool commandResult = false; try { commandResult = await _mediator.Send(new RemoveMeCommand(id)); return NoContent(); } catch (NotFoundException) { return NotFound(id); } } } } 

MyIntegrationTest.cs

[Fact] async Task Patch_MyAsync_WhenIdNotFound_ReturnsNotFoundStatusCode() { // Arrange var request = new HttpRequestMessage() { RequestUri = new Uri($"{_fixture.Client.BaseAddress}{_baseRoute}/1"), Method = HttpMethod.Patch, Headers = { { HttpRequestHeader.ContentEncoding.ToString(), Encoding.UTF8.ToString() }, { HttpRequestHeader.ContentType.ToString(), "application/json" } } }; // Act var response = await _fixture.Client.SendAsync(request); // Assert Assert.Equal(HttpStatusCode.NotFound, response.StatusCode); } 

What I've done so far

I've seen that this is a fairly common occurrence when trying to use the PUT, PATCH or DELETE http verbs. I've also seen that adding the following to a web.config file to remove the webDAV module from IIS is the suggested solution

Stackoverflow answer
A blog post

web.config

<?xml version="1.0" encoding="utf-8"?> <configuration> <system.webServer> <modules runAllManagedModulesForAllRequests="false"> <remove name="WebDAVModule" /> </modules> </system.webServer> </configuration> 

However, as you've probably guessed, this solution isn't working for me. My test returns a 405 MethodNotAllowed response.

Most of the info on this topic seem to be from a while ago, so I thought I'd ask the question here specifically for an ASP.NET Core API.

1 Answer

To fix the issue, correct the route constraint syntax enclose the parameter and datatype inside curly braces [Route("{id:int}")]

[Route("{id:int}")] [HttpPatch] public async Task<IActionResult> RemoveMeAsync(int id) { bool commandResult = false; try { commandResult = await _mediator.Send(new RemoveMeCommand(id)); return NoContent(); } catch (NotFoundException) { return NotFound(id); } }