如何在Visual Studio负载测试中接受HTTP 400和HTTP 500作为有效响应代码？

Question

I am using the Visual Studio 2013 web testing framework to stress-test a REST service. I want to measure how well the application performs when presented with pathological/malformed JSON in POST request. The server is responding with either HTTP 400 or HTTP 500 and I would like to consider both a success response.

I tried validating the response with the pass-all event handler:

public class MalformedBodyTest : WebTest 
{
    private void Validate(object sender, ValidationEventArgs e)
    {
        e.IsValid = true;
    }

    public MalformedBodyTest()
    {
        this.ValidateResponse += Validate;
    }

    ...

}

This does not seem to have any difference, the responses are still showing up as failed. Using ExpectedHttpStatusCode property of WebTestRequest works fine but only enables me to test for a single HTTP status code.

I would like the request to be considered failed just if the timeout is reached. Is there any way to achieve this functionality?

Answer 1

Ok, that was actually quite simple. I missed that there is also a property IgnoreHttpStatusCode in WebTestRequest . By setting it to true in the request generator

public override IEnumerator<WebTestRequest> GetRequestEnumerator()
{
    for (var i = 0; i < Iterations; ++i)
    {
        var request = new WebTestRequest(_url);
        request.IgnoreHttpStatusCode = true;

        ...

        yield return request;
    }
}

I was then able to precisely set which HTTP status codes to accept and which to reject in the validation handler:

private void Validate(object sender, ValidationEventArgs e)
{
    e.IsValid = (e.Response.StatusCode == HttpStatusCode.BadRequest ||
                 e.Response.StatusCode == HttpStatusCode.InternalServerError);
}