jQuery Call to WebService returns “No Transport” e

Question

I have the following web service;

    [WebMethod]
    public string HelloWorld()
    {
        return "Hello World";
    }

It's stock standard with no alterations to the class decorators.

I have this jQuery method;

var webMethod = "http://localhost:54473/Service1.asmx/HelloWorld"; 

$.ajax({
    type: "POST",
    contentType: "application/json; charset=utf-8",
    data: "{}",  
    dataType: "json",
    url: webMethod,
    success: function(msg){ alert(msg.d); },
    error: function (XMLHttpRequest, textStatus, errorThrown) {
        alert(errorThrown);
          }
});

It's a post action because later on I need to post data to it.

When I execute the jQuery I get a "No transport" error returned.

One thing I should also mention is that the jQuery is stored in a simple HTML file on my machine and the WebService is running on my machine also.

There is no code behind on the HTML page it's simply a web page and not a c# project or anything.

Can anyone please point me in the right direction here?

Answer 1

I solved it simply by removing the domain from the request url.

Before: https://some.domain.com/_vti_bin/service.svc

After: /_vti_bin/service.svc

Answer 2

None of the proposed answers completely worked for me. My use case is slightly different (doing an ajax get to an S3 .json file in IE9). Setting jQuery.support.cors = true; got rid of the No Transport error but I was still getting Permission denied errors.

What did work for me was to use the jQuery-ajaxTransport-XDomainRequest to force IE9 to use XDomainRequest. Using this did not require setting jQuery.support.cors = true;

Answer 3

If your jQuery page isn't being loaded from http://localhost:54473 then this issue is probably because you're trying to make cross-domain request.

Update 1 Take a look at this blog post.

Update 2 If this is indeed the problem (and I suspect it is), you might want to check out JSONP as a solution. Here are a few links that might help you get started:

• https://en.wikipedia.org/wiki/JSON
• http://remysharp.com/2007/10/08/what-is-jsonp/
• http://www.west-wind.com/weblog/posts/107136.aspx

Answer 4

Add this: jQuery.support.cors = true;

It enables cross-site scripting in jQuery (introduced after 1.4x, I believe).

We were using a really old version of jQuery (1.3.2) and swapped it out for 1.6.1. Everything was working, except .ajax() calls. Adding the above line fixed the problem.

Answer 5

I had the same error on a page, and I added these lines:

<!--[if lte IE 9]>
<script type='text/javascript' src='//cdnjs.cloudflare.com/ajax/libs/jquery-ajaxtransport-xdomainrequest/1.0.3/jquery.xdomainrequest.min.js'></script>
<![endif]-->

and it finally works for me ;) no more error in IE9.

Answer 6

i solve it by using dataType='jsonp' at the place of dataType='json'