IE8提示下载json响应

Question

I've been trying out the jquery form plugin and it works wonderfully. Oh, except for IE8. It's always ie8.

Anyways, on the success response callback, ie8 prompts me to download the response instead of actually calling the success function.

Here is what my javascript code looks like

 $("#form1").ajaxForm({
                url: "http://localhost:4887/api/file/POST",
                type: "POST",                 
                success: function (data)
                {
                    //response stuff here                   
                }
            });

I've tried specifying the datatype for the ajax form, but woe is me, it didn't work

The only thing I am returning from the server is just a string. Once again, IE8 prompts me to download this string instead of just calling the success function. After some research, I understand that I might have to modify the http headers? Could anyone shed some light on this? Or give another way of going about this?

UPDATE Here is a brief look at the C# controller

public class fileController : ApiController
{     
    public JsonResult POST()
    {
        HttpPostedFile file = null; 


       string encodedString = //do stuff here to get the base64 string

        ModelName obj = new ModelName();

        obj.characters = encodedString;
        JsonResult result = new JsonResult();
        result.Data = obj;
        result.ContentType = "text/html";

        return result;

    }

Request Headers...

Accept application/x-ms-application, image/jpeg, application/xaml+xml, image/gif, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, /

Accept-Language en-US

User-Agent Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E; InfoPath.3; .NET CLR 1.1.4322)

Content-Type multipart/form-data; boundary=---------------------------7dd3e622907b6

Accept-Encoding gzip, deflate

Proxy-Connection Keep-Alive

Content-Length 300

Response Headers HTTP/1.1 200 OK Cache-Control no-cache

Pragma no-cache

Content-Type application/json; charset=utf-8

Expires -1

Server Microsoft-IIS/8.0

X-AspNet-Version 4.0.30319 X-Powered-By ASP.NET

Answer 1

try this:

[HttpPost]
public JsonResult POST()
{
    HttpPostedFile file = null; ;
    string encodedString = //get the file contents, and get the base64 encoded string        
    ModelName obj= new ModelName();
    obj.characters = encodedString;
    return   Json(obj, "text/html");

}

Or change the content-type
Response.Content.Headers.ContentType = new MediaTypeHeaderValue("text/html");

example:

public JsonResult POST()
    {
        HttpPostedFile file = null; ;
        string encodedString = //get the file contents, and get the base64 encoded string        
        ModelName obj= new ModelName();
        obj.characters = encodedString;
        Response.Content.Headers.ContentType = new MediaTypeHeaderValue("text/html");
        return   Json(obj, "text/html");

    }