The Response.Write function is not functioning properly in the production environment

I have created a C# WebService (ASMX) with the code snippet below:

if (!SomeValidation())
{
    //context.Response.ContentType = "application/json";
    //context.Response.ContentType = "text/plain";
    context.Response.ContentType = "application/text";
    context.Response.StatusCode = 400;
    context.Response.Status = "400 Bad Request";
    context.Response.StatusDescription = "Bad Request";
    context.Response.Write("Error Message");
    //context.Response.Write("{ ErrorMessage: "Error Message" }");
    context.Response.End();
    return;
}

This ASMX is called through AJAX, and its error handling function includes:

error: function (request, status, error) {
    if (request.status === 400) {
        ShowMessage("Warning", request.responseText);
        console.log(request);
    } else {
        ShowMessage("Failure", "Error.");
        console.error(request);
        console.error(status);
        console.error(error);
    }
}

While running the code locally displays the correct message, when published, it fails to display the expected outcome and instead shows the Status Code message.

What could be causing this inconsistency?

Note: The commented sections in the code were attempted fixes that did not work as intended.

Answer №1

In your method, it is important to start by calling Response.Clear before writing anything to the response.

Before ending the response with Response.End, make sure to call Response.Flush at the end of your code.

Note:
For a smoother way to close the request, consider using Response.Close instead of End to avoid abruptly aborting the thread.

Additional Tip:
Referencing the documentation on HttpResponse#Close, it is recommended to utilize HttpApplication#CompleteRequest.

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