AJAX in Chrome sending OPTIONS instead of GET POST PUT DELETE

Question

I am working on an internal web application at work  In IE10 the requests work fine  but in Chrome all the AJAX requests  which there are many  are sent using OPTIONS instead of whatever defined method I give it  Technically my requests are  cross domain   The site is served on localhost 6120 and the service I m making AJAX requests to is on 57124  This closed jquery bug defines the issue  but not a real fix   What can I do to use the proper http method in ajax requests   Edit   This is in the document load of every page   jQuery support cors   true    And every AJAX is built similarly   var url    http   localhost 57124 My Rest Call     ajax       url  url      dataType   json       data  json      async  true      cache  false      timeout  30000      headers     x-li-format    json    X-UserName   userName        success  function  data               my success stuff            error  function  request  status  error               my error stuff            type   POST

User · Answer

I ve encountered a very similar issue  I spent almost half a day to understand why everything works correctly in Firefox and fails in Chrome  In my case it was because of duplicated  or maybe mistyped  fields in my request header

User · Answer

preflighted  requests first send an HTTP request by the OPTIONS method to the resource on the other domain  in order to determine whether the actual request is safe to send  Cross-site requests  https   developer mozilla org en-US docs Web HTTP Access control CORS

User · Answer

I agree with Kevin B  the bug report says it all   It sounds like you are trying to make cross-domain ajax calls   If you re not familiar with the same origin policy you can start here  https   developer mozilla org en-US docs Web JavaScript Same origin policy for JavaScript   If this is not intended to be a cross-domain ajax call  try making your target url relative and see if the problem goes away   If you re really desperate look into the JSONP  but beware  mayhem lurks   There really isn t much more we can do to help you

User · Answer

Chrome is preflighting the request  to look for CORS headers  If the request is acceptable  it will then send the real request  If you re doing this cross-domain  you will simply have to deal with it or else find a way to make the request non-cross-domain  This is why the jQuery bug was closed as won t-fix  This is by design      Unlike simple requests  discussed above    preflighted  requests first   send an HTTP request by the OPTIONS method to the resource on the   other domain  in order to determine whether the actual request is safe   to send   Cross-site requests are preflighted like this since they may   have implications to user data   In particular  a request is   preflighted if          It uses methods other than GET  HEAD or POST   Also  if POST is used to send request data with a Content-Type other than   application x-www-form-urlencoded  multipart form-data  or text plain    e g  if the POST request sends an XML payload to the server using   application xml or text xml  then the request is preflighted    It sets custom headers in the request  e g  the request uses a header such as X-PINGOTHER

User · Answer

In my case I m calling an API hosted by AWS  API Gateway   The error happened when I tried to call the API from a domain other than the API own domain  Since I m the API owner I enabled CORS for the test environment  as described in the Amazon Documentation   In production this error will not happen  since the request and the api will be in the same domain   I hope it helps

User · Answer

Based on the fact that the request isn t sent on the default port 80 443 this Ajax call is automatically considered a cross-origin resource  CORS  request  which in other words means that the request automatically issues an OPTIONS request which checks for CORS headers on the server s servlet s side    This happens even if you set  crossOrigin  false    or even if you ommit it   The reason is simply that localhost    localhost 57124  Try sending it only to localhost without the port - it will fail  because the requested target won t be reachable  however notice that if the domain names are equal the request is sent without the OPTIONS request before POST

User · Answer

ajax               url                     contentType   text plain  charset utf-8               async  false              xhrFields                    withCredentials  true                  crossDomain  true                  Authorization   Bearer                                   method   POST                data  JSON stringify  request                success  function  data                    console log data                               the contentType   text plain  charset utf-8   or just contentType   text plain   works for me  regards

User · Answer

Consider using axios  axios get  url    headers    Content-Type    application json       then  res   gt       if res data error         else        doAnything  res data           catch function  error       doAnythingError error        I had this issue using fetch and axios worked perfectly

User · Answer

As answered by  Dark Falcon  I simply dealt with it   In my case  I am using node js server  and creating a session if it does not exist  Since the OPTIONS method does not have the session details in it  it ended up creating a new session for every POST method request   So in my app routine to create-session-if-not-exist  I just added a check to see if method is OPTIONS  and if so  just skip session creating part       app use function req  res  next            if  req method      OPTIONS                 if  req session  amp  amp  req session id                        Session exists                  next                 else                      Create session                  next                          else                 If request method is OPTIONS  just skip this part and move to the next method             next

User · Answer

If it is possible pass the params through regular GET POST with a different name and let your server side code handles it   I had a similar issue with my own proxy to bypass CORS and I got the same error of POST- OPTION in Chrome   It was the Authorization header in my case   x-li-format  and  X-UserName  here in your case    I ended up passing it in a dummy format  e g  AuthorizatinJack in GET  and I changed the code for my proxy to turn that into a header when making the call to the destination   Here it is in PHP   if  isset   GET  AuthorizationJack            request headers      Authorization  Basic     GET  AuthorizationJack

User · Answer

Use fetch instead of XHR then the request will not be prelighted even it s cross-domained

[jquery] AJAX in Chrome sending OPTIONS instead of GET/POST/PUT/DELETE?

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