404 error when making a POST call from Angular HttpClient to ASP.NET Core 2.2 Web API (with CORS enabled)

Question

I\'ve written a simple ASP.NET Core 2.2 Web API. The POST method always returns a 404, but GET requests succeed.

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Answer 1

You have not specified a route to the action. You can either change your post to go to /api/Test or set the attributes on the action as follows:

[HttpPost("Create")]
public async Task<ActionResult<string>> Create([FromBody] TestPayload value)
{
    return Ok("");
}

or

[HttpPost]
[Route("Create")]
public async Task<ActionResult<string>> Create([FromBody] TestPayload value)
{
    return Ok("");
}

or update the controller route to include the action

[Route("api/[controller]/[action]")]

Answer 2

Try to add:

[EnableCors(origins: " * ", headers: " * ", methods: " * ")]

to your Controller class. ( remove with spaces in the quotes )

More info on Microsoft-Website