WEB API HttpResponseMessage return JSONP

Question

I use the following method to create an HttpResponseMessage object and return it via my Web API project:

public HttpResponseMessage CreateHttpResponseMessage(string message, HttpStatusCode httpStatusCode)
{
    var stringContent = new StringContent(message, new UTF8Encoding(), "application/javascript");
    return new HttpResponseMessage(httpStatusCode)
        {
            Content = stringContent
        };
}

I'm using this to return a jsonp payload however it keeps returning with content type text/plain and not application/javascript. This is causing the browser console to log this warning:

Resource interpreted as Script but transferred with MIME type text/plain

The message I'm returning isn't null or empty and therefore I'm confused as to why it's behaving this way.

Mihai Dinculescu · Accepted Answer · 2014-12-23 14:17:10Z

1

You cannot return JSONP as plain text as you are trying to return.

You need to configure your Web API to use a JSONP MediaTypeFormatter. A such formatter is offered in WebApiContrib.

Install-Package WebApiContrib.Formatting.Jsonp

Add to Application_Start:

GlobalConfiguration.Configuration.Formatters.Insert(0, new JsonpMediaTypeFormatter(new JsonMediaTypeFormatter()));

Resources:
http://stevenhollidge.blogspot.in/2013/03/how-to-return-jsonp-from-webapi.html
http://www.codeproject.com/Tips/631685/JSONP-in-ASP-NET-Web-API-Quick-Get-Started

answered Dec 23, 2014 at 14:17

Mihai Dinculescu

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