jQuery .ajax() POST Request throws 405 (Method Not Allowed) on RESTful WCF

by

Your code is actually attempting to make a Cross-domain (CORS) request, not an ordinary POST.

That is: Modern browsers will only allow Ajax calls to services in the same domain as the HTML page.

Example: A page in http://www.example.com/myPage.html can only directly request services that are in http://www.example.com, like http://www.example.com/testservice/etc. If the service is in other domain, the browser won’t make the direct call (as you’d expect). Instead, it will try to make a CORS request.

To put it shortly, to perform a CORS request, your browser:

  • Will first send an OPTION request to the target URL
  • And then only if the server response to that OPTION contains the adequate headers (Access-Control-Allow-Origin is one of them) to allow the CORS request, the browse will perform the call (almost exactly the way it would if the HTML page was at the same domain).
    • If the expected headers don’t come, the browser simply gives up (like it did to you).

How to solve it? The simplest way is to enable CORS (enable the necessary headers) on the server.

If you don’t have server-side access to it, you can mirror the web service from somewhere else, and then enable CORS there.

More Related Contents:

  1. jQuery posting JSON
  2. Jquery Ajax Posting JSON to webservice
  3. jQuery Call to WebService returns “No Transport” error
  4. How do I catch an Ajax query post error?
  5. How to return JSON from a 2.0 asmx web service
  6. How do I POST with jQuery/Ajax in Django?
  7. How to add additional fields to form before submit?
  8. jQuery – Illegal invocation
  9. POST to server, receive PDF, deliver to user w/ jQuery
  10. Error 415 Unsupported Media Type: POST not reaching REST if JSON, but it does if XML
  11. 403 Forbidden error when making an ajax Post request in Django framework
  12. Getting 400 bad request error in Jquery Ajax POST
  13. Using PUT/POST/DELETE with JSONP and jQuery
  14. How to call a web service from jQuery [duplicate]
  15. Can I return JSON from an .asmx Web Service if the ContentType is not JSON?
  16. Best way to support “application/x-www-form-urlencoded” post data with WCF?
  17. Ajax call to download file returned from RESTful service
  18. How can I pass windows authentication to webservice using jQuery?
  19. Rails not decoding JSON from jQuery correctly (array becoming a hash with integer keys)
  20. How to use getJSON, sending data with post method?
  21. jQuery ajax call to REST service
  22. jQuery ajax upload with progress bar – no flash
  23. Passing complex objects into a WCF Rest Service
  24. What should a JSON service return on failure / error
  25. How do I POST an array of objects with $.ajax (jQuery or Zepto)
  26. “How” to save an entire collection in Backbone.js – Backbone.sync or jQuery.ajax?
  27. Cannot set content-type to ‘application/json’ in jQuery.ajax
  28. Bootstrap 4 with remote Modal
  29. jQuery – How to select value by attribute name starts with
  30. jQuery Removing specific text from an element

Leave a Comment