CODEWITHSUNDEEP
c#.netazureasp.net-coreasp.net-core-webapi
eks77ern
eks77ern

Reputation: 41

ASP.NET Core handle Method Not Allowed 405

Developing an API platform that needs to be consistent through App Service itself and covering Azure API Management Service - I found myself stuck with an inconsistencies between both.

Sending a request with improper HTTP verb (e.g. PUT instead of POST) to API Management service results with 404 Not found response (due to a known issue).

Sending same request directly to ASP Core 2.2 based app would result in 405 Not Allowed response.

Is there any possibility in ASP Core (possibly middleware) to catch 405 response code result and change it to 404?

Upvotes: 2

Views: 3406

Answers (2)

Kirk Larkin
Kirk Larkin

Reputation: 93273

This is something that you can handle with the StatusCodePages middleware. Here's an example:

app.UseStatusCodePages(ctx =>
{
    if (ctx.HttpContext.Response.StatusCode == 405)
        ctx.HttpContext.Response.StatusCode = 404;

    return Task.CompletedTask;
});

The argument passed into UseStatusCodePages is a callback function that is executed whenever the middleware detects a response with a status code between 400 and 599 (with an empty body). In the example above, we simply check for 405 and change it to 404. The call to UseStatusCodePages itself must be placed before any request-handling middleware, such as MVC.

Upvotes: 1

Nigel Whatling
Nigel Whatling

Reputation: 2391

Not sure if I'm a fan of just doing blind status code conversion. Up to you based on your exact scenario, of course.

This bit of middleware injected in your Configure method would do the trick:

public void Configure(IApplicationBuilder app)
{
    app.Use(next => context =>
    {
        context.Response.OnStarting(() =>
        {
            if (context.Response.StatusCode == 405)
            {
                context.Response.StatusCode = 404;
            }

            return Task.CompletedTask;
        });

        return next(context);
    });
}

NOTE: Add this early in the chain.

Upvotes: 3

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