jQuery Call to WebService returns No Transport error

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

User · Answer

I had the same error on a page  and I added these lines    lt  -- if lte IE 9  gt   lt script type  text javascript  src    cdnjs cloudflare com ajax libs jquery-ajaxtransport-xdomainrequest 1 0 3 jquery xdomainrequest min js  gt  lt  script gt   lt   endif -- gt    and it finally works for me    no more error in IE9

User · Answer

For me it is an entirely different story  Since this page has a good search engine ranking  I should add my case and the solution here too   I built jquery myself with webpack picking only the modules I use  The ajax is always failed with  No Transport  message as the only clue   After a long debugging  the problem turns out to be XMLHttpRequest is pluggable in jquery and it not include by default     You have to explicitly include jquery src ajax xhr file in order to make the ajax working in browsers

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

I too got this problem and all solutions given above either failed or were not applicable due to client webservice restrictions   For this  I added an iframe in my page which resided in the client s server  So when we post our data to the iframe and the iframe then posts it to the webservice  Hence the cross-domain referencing is eliminated    We added a 2-way origin check to confirm only authorized page posts data to and from the iframe   Hope it helps   lt iframe style  display none   id  receiver  name  receiver  src  https   iframe-address-at-client-server  gt    lt  iframe gt     send data to iframe var hiddenFrame   document getElementById  receiver   contentWindow  hiddenFrame postMessage JSON stringify message    https   client-server-url       The iframe receives the data using the code  window onload   function          var eventMethod   window addEventListener    addEventListener     attachEvent       var eventer   window eventMethod       var messageEvent   eventMethod     attachEvent     onmessage     message       eventer messageEvent  function  e            var origin   e origin            if origin not in pre-defined list  break and return         var messageFromParent   JSON parse e data           var json   messageFromParent data             send json to web service using AJAX              return the response back to source         e source postMessage JSON stringify aJAXResponse   e origin          false

User · Answer

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

User · Answer

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

[jquery] jQuery Call to WebService returns "No Transport" error

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