Cannot set content-type to application json in jQuery ajax

Question

When I have this code    ajax       type   POST         contentType   application json       url   http   localhost 16329 Hello       data    name   norm         dataType   json        in Fiddler I can see following raw request  POST http   localhost 16329 Hello HTTP 1 1 Host  localhost 16329 User-Agent  Mozilla 5 0  Windows NT 6 1  WOW64  rv 10 0 2  Gecko 20100101 Firefox 10 0 2 Accept  application json  text javascript       q 0 01 Accept-Language  ru-ru ru q 0 8 en-us q 0 5 en q 0 3 Accept-Encoding  gzip  deflate Connection  keep-alive Content-Type  application x-www-form-urlencoded  charset UTF-8 Referer  http   localhost 14693 WebSite1 index html Content-Length  9 Origin  http   localhost 14693 Pragma  no-cache Cache-Control  no-cache  name norm   But what I m trying is to set content-type from application x-www-form-urlencoded to application json  But this code    ajax       type   POST       contentType   application json       url   http   localhost 16329 Hello       data    name   norm         dataType   json        Generates strange request  which I can see in Fiddler   OPTIONS http   localhost 16329 Hello HTTP 1 1 Host  localhost 16329 User-Agent  Mozilla 5 0  Windows NT 6 1  WOW64  rv 10 0 2  Gecko 20100101 Firefox 10 0 2 Accept  text html application xhtml xml application xml q 0 9     q 0 8 Accept-Language  ru-ru ru q 0 8 en-us q 0 5 en q 0 3 Accept-Encoding  gzip  deflate Connection  keep-alive Origin  http   localhost 14693 Access-Control-Request-Method  POST Access-Control-Request-Headers  content-type Pragma  no-cache Cache-Control  no-cache   Why is that  What is OPTIONS when it should be POST there  And where is my content-type set to application json  And request parameters has gone for some reason   UPDATE 1  On server side I have really simple RESTful service    AspNetCompatibilityRequirements RequirementsMode   AspNetCompatibilityRequirementsMode Allowed   public class RestfulService   IRestfulService        WebInvoke          Method    POST           UriTemplate    Hello           ResponseFormat   WebMessageFormat Json       public string HelloWorld string name                return  hello      name            But for some reason I can t call this method with parameters   UPDATE 2  Sorry for not answering so long    I ve added these headers to my server response   Access-Control-Allow-Origin     Access-Control-Allow-Headers  Content-Type  Access-Control-Allow-Methods  POST  GET  OPTIONS   It didn t help  I have Method not allowed error from server   Here is what my fiddler says    So  now I can be sure that my server accepts POST  GET  OPTIONS  if response headers work like I expect   But why  Method not allowed    In WebView response from server  you can see Raw response on picture above  looks like this

User · Answer

I found the solution for this problem here  Don t forget to allow verb OPTIONS on IIS app service handler    Works fine  Thank you Andr   Pedroso   -

User · Answer

If you use this   contentType   application json    AJAX won t sent GET or POST params to the server     dont know why   It took me hours to lear it today   Just Use     ajax      url    http   blabla com wsGetReport php       data   myFormData  type    POST   dataType    json           contentType   application json        success   function wsQuery

User · Answer

I recognized those screens  I m using CodeFluentEntities  and I ve got solution that worked for me as well   I m using that construction     ajax      url  path     type   POST      contentType   text plain      data    some   some       as you can see  if I use    contentType        or  contentType   text plain     chrome   Everything works fine   I m not 100  sure that it s all that you need  cause I ve also changed headers

User · Answer

Hi These two lines worked for me      contentType  application json  charset utf-8                             dataType  json       ajax               type   POST               url    v1 candidates               data  obj                contentType  application json  charset utf-8               dataType  json                 success  function  data                    table row add                       data name  data title                    draw false                   Thanks  Prashant

User · Answer

I got the solution to send the JSON data by POST request through jquery ajax  I used below code      var data   new Object        data p clientId   4      data    JSON stringify data          ajax         method   POST         url   http   192 168 1 141 8090 api Client Add         data  data        headers             Accept    application json            Content-Type    text plain                      done function  msg             alert   Data Saved      msg                                      I used  Content-Type    text plain  in header to send the raw json data  Because if we use Content-Type   application json  the request methods converted to OPTION  but using Content-Type   test plain  the method does not get converted and remain as POST  Hopefully this will help some one

User · Answer

I had the same issue  I m running a java rest app on a jboss server  But I think the solution is similar on an ASP  NET webapp   Firefox makes a pre call to your server   rest url to check which options are allowed  That is the  OPTIONS  request which your server doesn t reply to accordingly  If this OPTIONS call is replied correct a second call is performed which is the actual  POST  request with json content   This only happens when performing a cross-domain call  In your case calling  http   localhost 16329 Hello  instead of calling a url path under the same domain   Hello   If you intend to make a cross domain call you have to enhance your rest service class with an annotated method the supports a  OPTIONS  http request  This is the according java implementation    Path   rest   public class RestfulService         POST      Path   Hello        Consumes MediaType APPLICATION JSON       Produces MediaType TEXT PLAIN      public string HelloWorld string name                return  hello      name           THIS NEEDS TO BE ADDED ADDITIONALLY IF MAKING CROSS-DOMAIN CALLS       OPTIONS      Path   Hello        Produces MediaType TEXT PLAIN    charset utf-8       public Response checkOptions            return Response status 200           header  Access-Control-Allow-Origin                 header  Access-Control-Allow-Headers    Content-Type            header  Access-Control-Allow-Methods    POST  OPTIONS     CAN BE ENHANCED WITH OTHER HTTP CALL METHODS           build              So I guess in  NET you have to add an additional method annotated with   WebInvoke          Method    OPTIONS           UriTemplate    Hello           ResponseFormat   WebMessageFormat      where the following headers are set   header  Access-Control-Allow-Origin                 header  Access-Control-Allow-Headers    Content-Type            header  Access-Control-Allow-Methods    POST  OPTIONS

User · Answer

I can show you how I used it     function GetDenierValue             var denierid       productDenierid   val           0       productDenierid   val            var param      productDenierid   denierid              ajax               url    Admin ProductComposition GetDenierValue               dataType   json               contentType   application json charset utf-8               type   POST               data  JSON stringify param               success  function  msg                    if  msg    null                        return msg URL

User · Answer

It would seem that removing http    from the url option ensures the the correct HTTP POST header is sent   I dont think you need to fully qualify the name of the host  just use a relative URL as below        ajax         type   POST         contentType   application json         url    Hello         data    name   norm           dataType   json           An example of mine that works             ajax               type   POST               url  siteRoot    api SpaceGame AddPlayer               async  false              data  JSON stringify   Name  playersShip name  Credits  playersShip credits                 contentType   application json               complete  function  data                console log data               wait   false                      Possibly related   jQuery   ajax      post sending  quot OPTIONS quot  as REQUEST METHOD in Firefox  Edit  After some more research I found out the OPTIONS header is used to find out if the request from the originating domain is allowed  Using fiddler  I added the following to the response headers from my server    Access-Control-Allow-Origin     Access-Control-Allow-Headers  Content-Type  Access-Control-Allow-Methods  POST  GET  OPTIONS   Once the browser received this response it then sent off the correct POST request with json data  It would seem that the default form-urlencoded content type is considered safe and so does not undergo the extra cross domain checks   It looks like you will need to add the previously mentioned headers to your servers response to the OPTIONS request  You should of course configure them to allow requests from specific domains rather then all   I used the following jQuery to test this     ajax      type   POST      url   http   myDomain com path AddPlayer      data  JSON stringify         Name   Test          Credits  0             contentType   application json      dataType   json      complete  function data              content   html data              References    http   www w3 org Protocols rfc2616 rfc2616-sec9 html http   enable-cors org  https   developer mozilla org en http access control

User · Answer

So all you need to do for this to work is add   headers         Accept    application json        Content-Type    application json      as a field to your post request and it ll work

[json] Cannot set content-type to 'application/json' in jQuery.ajax

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