jQuery ajax post sending OPTIONS as REQUEST METHOD in Firefox

Question

Having trouble with what I thought was a relatively simple jQuery plugin     The plugin should fetch data from a php script via ajax to add options to a  lt select gt    The ajax request is pretty generic     ajax     url  o url    type   post     contentType   application x-www-form-urlencoded     data     method   getStates    program   EXPLORE       success  function  data  status        console log  Success          console log data       console log status          error  function  xhr  desc  err        console log xhr       console log  Desc      desc     nErr     err             This seems to work fine in Safari   In Firefox 3 5  the REQUEST TYPE on the server is always  OPTIONS   and the   POST data does not appear   Apache logs the request as type  OPTIONS      1 - -  08 Jul 2009 11 43 27 -0500   OPTIONS sitecodes php HTTP 1 1  200 46   Why would this ajax call work in Safari  but not Firefox  and how do I fix it for Firefox    Response Headers Date  Wed  08 Jul 2009 21 22 17 GMT Server Apache 2 0 59  Unix  PHP 5 2 6 DAV 2 X-Powered-By  PHP 5 2 6 Content-Length  46 Keep-Alive  timeout 15  max 100 Connection  Keep-Alive Content-Type    text html  Request Headers Host    orderform 8888 User-Agent  Mozilla 5 0  Macintosh  U  Intel Mac OS X 10 5  en-US  rv 1 9 1  Gecko 20090624 Firefox 3 5 Accept  text html application xhtml xml application xml q 0 9     q 0 8 Accept-Language en-us en q 0 5 Accept-Encoding gzip deflate Accept-Charset  ISO-8859-1 utf-8 q 0 7   q 0 7 Keep-Alive  300 Connection  keep-alive Origin  http   ux inetu act org Access-Control-Request-Method   POST Access-Control-Request-Headers  x-requested-with   Here is a picture of the Firebug output

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Another possibility to circumvent the problem is to use a proxy script  That method is described for example here

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I used the following code on Django side to interpret the OPTIONS request and to set the required Access-Control headers  After this my cross domain requests from Firefox started working  As said before  the browser first sends the OPTIONS request and then immediately after that the POST GET  def send data request       if request method     OPTIONS            response   HttpResponse           response  Access-Control-Allow-Origin                 response  Access-Control-Allow-Methods      POST  GET  OPTIONS          response  Access-Control-Max-Age     1000           note that     is not valid for Access-Control-Allow-Headers         response  Access-Control-Allow-Headers      origin  x-csrftoken  content-type  accept          return response     if request method     POST                    Edit  it seems to be that at least in some cases you also need to add the same Access-Control headers to the actual response  This can be a little bit confusing  since the request seems to succeed  but Firefox does not pass the contents of the response to the Javascript

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Can you try this without   contentType application x-www-form-urlencoded

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Check if your form s action URL includes the www part of the domain  while the original page you have opened is viewed without www   Typically done for Canonical Urls    I struggled for hours before stumbling upon this article and found the hint of Cross Domain

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Culprit is preflight request using OPTIONS method  For HTTP request methods that can cause side-effects on user data  in particular  for HTTP methods other than GET  or for POST usage with certain MIME types   the specification mandates that browsers  preflight  the request  soliciting supported methods from the server with an HTTP OPTIONS request method  and then  upon  approval  from the server  sending the actual request with the actual HTTP request method   Web specification refer to  https   developer mozilla org en-US docs Web HTTP Access control CORS  I resolved the problem by adding following lines in Nginx conf       location                    if   request method   OPTIONS                        add header Access-Control-Allow-Origin                          add header Access-Control-Allow-Methods  POST  GET  PUT  UPDATE  DELETE  OPTIONS                      add header Access-Control-Allow-Headers  Authorization                      add header Access-Control-Allow-Credentials   true                      add header Content-Length 0                     add header Content-Type text plain                     return 200                       location      xxxx                     if   request method   OPTIONS                        rewrite          last

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Please be advised   JSONP supports only the GET request method    Send request by firefox      ajax      type   POST     lt  lt        contentType   application json      url  url     dataType   json    lt  lt                             Above request send by OPTIONS while    type   POST          ajax       type   POST     lt  lt         contentType   application json       url  url      dataType   jsonp    lt  lt                              But above request send by GET while    type   POST        When you are in  cross-domain communication    pay attention and be careful

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I used a proxy url to solve a similar problem when I want to post data to my apache solr hosted in another server   This may not be the perfect answer but it solves my problem    Follow this URL  Using Mode-Rewrite for proxying  I add this line to my httpd conf    RewriteRule  solr       http   ip 8983 solr 1  P    Therefore  I can just post data to  solr instead of posting data to http   ip 8983 solr    Then it will be posting data in the same origin

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This  mozilla developer center article describes various cross-domain request scenarios  The article seems to indicate that a POST request with content type of  application x-www-form-urlencoded  should be sent as a  simple request   with no  preflight  OPTIONS request   I found   however  that Firefox sent the OPTIONS request  even though my POST was sent with that content type   I was able to make this work by creating an options request handler on the server  that set the  Access-Control-Allow-Origin  response header to      You can be more restrictive by setting it to something specific  like  http   someurl com   Also  I have read that  supposedly  you can specify a comma-separated list of multiple origins  but I couldn t get this to work   Once Firefox receives the response to the OPTIONS request with an acceptable  Access-Control-Allow-Origin  value  it sends the POST request

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This PHP at the top of the responding script seems to work    With Firefox 3 6 11   I have not yet done a lot of testing    header  Access-Control-Allow-Origin       header  Access-Control-Allow-Methods  POST  GET  OPTIONS    header  Access-Control-Max-Age  1000    if array key exists  HTTP ACCESS CONTROL REQUEST HEADERS     SERVER         header  Access-Control-Allow-Headers                   SERVER  HTTP ACCESS CONTROL REQUEST HEADERS       else       header  Access-Control-Allow-Headers          if  OPTIONS       SERVER  REQUEST METHOD          exit 0

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I had a similar problem with trying to use the Facebook API    The only contentType which didn t send the Preflighted request seemed to be just text plain    not the rest of the parameters mentioned at mozilla here   Why is this the only browser which does this  Why doesn t Facebook know and accept the preflight request    FYI  The aforementioned Moz doc suggests X-Lori headers should trigger a Preflighted request     it doesn t

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I ve fixed this issue using an entirely-Apache based solution   In my vhost   htaccess I put the following block     enable cross domain access control Header always set Access-Control-Allow-Origin     Header always set Access-Control-Allow-Methods  POST  GET  OPTIONS     force apache to return 200 without executing my scripts RewriteEngine On RewriteCond   REQUEST METHOD  OPTIONS RewriteRule       R 200 L    You may not need the latter part  depending on what happens when Apache executes your target script   Credit goes to the friendly ServerFault folk for the latter part

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I had same problem with sending requests to google maps  and solution is quite simple with jQuery 1 5 - for dataType use dataType   jsonp

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I was looking through source 1 3 2  when using JSONP  the request is made by building a SCRIPT element dynamically  which gets past the browsers Same-domain policy  Naturally  you can t make a POST request using a SCRIPT element  the browser would fetch the result using GET    As you are requesting a JSONP call  the SCRIPT element is not generated  because it only does this when the Type of AJAX call is set to GET   http   dev jquery com ticket 4690

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We had a problem like this with ASP Net  Our IIS was returning an Internal Server Error when trying to execute a jQuery   post to get some html content due to PageHandlerFactory was restricted to respond only GET HEAD POST DEBUG Verbs  So you can change that restriction adding the verb  OPTIONS  to the list or selecting  All Verbs   You can modify that in your IIS Manager  selecting your website  then selecting Handler Mappings  double click in your PageHandlerFactory for   apx files as you need  We use Integrated application pool with framework 4 0   Click on Request Restrictions  then go to Verbs Tabn and apply your modification   Now our   post request is working as expected

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The reason for the error is the same origin policy  It only allows you to do XMLHTTPRequests to your own domain  See if you can use a JSONP callback instead     getJSON   http    lt url gt  api php callback     function   data     alert   data

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Solution to this is    use dataType  json add  amp callback   to your url   this worked on calling Facebook API and with Firefox  Firebug is using GET instead of OPTIONS with the above conditions  both of them

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I already have this code handling well my cors situation in php   header   Access-Control-Allow-Origin    CMSConfig  ALLOW DOMAIN    header   Access-Control-Allow-Headers    CMSConfig  ALLOW DOMAIN    header   Access-Control-Allow-Credentials  true       And it was working fine locally and remotely  but not for uploads when remote   Something happen with apache php OR my code  I didn t bother to search it  when you request OPTIONS it returns my header with cors rules but with 302 result  Therefore my browser doesn t recognise as an acceptable situation   What I did  based on  Mark McDonald answer  is just put this code after my header   if    SERVER  REQUEST METHOD        OPTIONS          header  HTTP 1 1 202 Accepted        exit      Now  when requesting OPTIONS it will just send the header and 202 result

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Try to add the following   dataType   json   ContentType   application json   data  JSON stringify   method   getStates    program   EXPLORE

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I have posted a clear example of how to solve this if control the server code of the domain you are POSTing to   This answer is touched on in this thread  but this more clearly explains it IMO   How do I send a cross-domain POST request via JavaScript

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function test success page name id divname str      var dropdownIndex   document getElementById name  selectedIndex   var dropdownValue   document getElementById name  dropdownIndex  value   var params   amp   id     dropdownValue   amp   str     makerequest sp url  params  divid1       ajax       url  page      type   post       data  params         callback handler that will be called on success     success  function response  textStatus  jqXHR              log a message to the console         document getElementById divname  innerHTML   response           var retname    n district           var dropdownIndex   document getElementById retname  selectedIndex          var dropdownValue   document getElementById retname  dropdownIndex  value          if dropdownValue  gt 0                          alert dropdownValue               document getElementById  inputname   value   dropdownValue                    else                       document getElementById  inputname   value    00                     return          url2 page2           var params2   parrams2   amp            makerequest sp url2  params2  divid2

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You need to do some work on server side  I see you are using PHP on server side  but solution for  NET web application is here  Cannot set content-type to   39 application json  39  in jQuery ajax  Do the same in PHP script and it will work  Simply  At first request browser is asking server if is allowed to send such data with such type and second request is the proper allowed

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I seems that if o url    index php  and this file exists is ok and returning a success message in the console  It returns an error if I use url http   www google com  If doing a post request why not using directly the   post method     post  test php     func   getNameAndTime         function data           alert data name      John         console log data time       2pm         json      It is so much simpler

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Try adding the option   dataType   json

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