JQuery Ajax Post results in 500 Internal Server Error

Question

I am trying to perform this AJAX post but for some reason I am getting a server 500 error  I can see it hit break points in the controller  So the problem seems to be on the callback  Anyone     ajax       type   POST       url   InlineNotes Note ashx id     noteid      data            dataType   json        success  function data            alert data 1               error  function data           alert  fail                This is the string that should be returned    status  200   text   Something

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In my case it was simple issue  but hard to find  Page directive had wrong Inherits attributes  It just need to include the top level and it worked    Wrong code   lt    Page Language  C   CodeBehind  BusLogic aspx cs  Inherits  BusLogic   gt    Correct code   lt    Page Language  C   CodeBehind  BusLogic aspx cs  Inherits  Web BusLogic    gt

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You can look up HTTP status codes here  or here   this error is telling you    The server encountered an unexpected condition which prevented it from fulfilling the request    You need to debug your server

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Use a Try Catch block on your server side and in the catch block pass back the exception error to the client   This should give you a helpful error message

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I found this occurred in chrome when I did two ajax queries in the jquery  on load  handler    i e  like   function       ajax         ajax            I avoided it using   setTimeout function to do 2nd ajax request  1     it s presumably a chrome and or jquery bug

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I have had similar issues with AJAX code that sporadically returns the  500 internal server error   I resolved the problem by increasing the  fastCGI  RequestTimeout and ActivityTimeout values

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Can you post the signature of your method that is supposed to accept this post   Additionally I get the same error message  possibly for a different reason  My YSOD talked about the dictionary not containing a value for the non-nullable value   The way I got the YSOD information was to put a breakpoint in the   ajax function that handled an error return as follows    lt script type  text javascript  language  javascript  gt  function SubmitAjax url  message  successFunc  errorFunc          ajax           type  POST           url url          data message          contentType   application json  charset utf-8           dataType   json           success successFunc          error errorFunc                   Then my errorFunc javascript is like this   function request  textStatus  errorThrown                install   text  Error doing auto-installer search  proceed with ticket submission n           request statusText       Using IE I went to view menu -  script debugger -  break at next statement  Then went to trigger the code that would launch my post  This usually took me somewhere deep inside jQuery s library instead of where I wanted  because the select drop down opening triggered jQuery  So I hit StepOver  then the actual next line also would break  which was where I wanted to be  Then VS goes into client side dynamic  mode for that page  and I put in a break on the     install   line so I could see  using mouse over debugging  what was in request  textStatus  errorThrown  request  In request ResponseText there was an html message where I saw    lt title gt The parameters dictionary contains a null entry for parameter  appId  of non-nullable type  System Int32  for method  System Web Mvc ContentResult CheckForInstaller Int32   in  HLIT TicketingMVC Controllers TicketController   An optional parameter must be a reference type  a nullable type  or be declared as an optional parameter  lt br gt Parameter name  parameters lt  title gt    so check all that  and post your controller method signature in case that s part of the issue

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I just had this problem myself  even though i couldn t find the reason for it in my case  when  changing from POST to GET  the problem 500 error disappeared    type  POST

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I had this issue  and found out that the server side C  method should be static    Client Side     ajax               type   POST               url   Default aspx ListItem Selected               data                    dataType   json               contentType   application json  charset utf-8               success  ListItemElectionSuccess              error  ListItemElectionError                      function ListItemElectionSuccess data                alert  data d                      function ListItemElectionError data                 Server Side   public partial class  Default   System Web UI Page       protected void Page Load object sender  EventArgs e                     WebMethod       ScriptMethod ResponseFormat   ResponseFormat Json       public static String ListItem Selected                 return  server responce

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The JSON data you are passing to the server should have same name as you forming in client side  Ex   var obj      Id      CompanyId   val                 Name      CompanyName   val                     Ajax data  obj  url   home InsertCompany         If the name is different  ex     HttpPost  public ActionResult InsertCompany Int32 Id  string WrongName        You will get this error   If you are not passing the data  remove the data attribute from AJAX request

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When using the CodeIgniter framework with CSRF protection enabled  load the following script in every page where an ajax POST may happen     function          ajaxSetup           data                 lt  php echo  this- gt config- gt item  csrf token name      gt     cookie   lt  php echo  this- gt config- gt item  csrf cookie name      gt                            Requires  jQuery and jQuery cookie plugin  Sources  https   stackoverflow com a 7154317 2539869 and http   jerel co blog 2012 03 a-simple-solution-to-codeigniter-csrf-protection-and-ajax

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I m late on this  but I was having this issue and what I ve learned was that it was an error on my PHP code  in my case the syntax of a select to the db   Usually this error 500 is something to do using syntax - in my experience  In other word   peopleware  issue   D

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I found myself having this error to  I had  htaccess redirect configured in a directory  Well it reroutes ajax calls to ofcourse    post    ajax php    so it couldn t find the actual file  resulting in 500 error    I  fixed  it by placing the ajax php in a directory  So  htaccess didn t affect

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I suspect that the server method is throwing an exception after it passes your breakpoint   Use Firefox Firebug or the IE8 developer tools to look at the actual response you are getting from the server   If there has been an exception you ll get the YSOD html  which should help you figure out where to look   One more thing -- your data property should be    not       the former is an empty object while the latter is a string that is invalid as a query parameter   Better yet  just leave it out if you aren t passing any data

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I also faced the same problem  Here are two ways by which I have solved it- 1  If you re using some framework  make sure you are sending a CSRF token with the ajax call as well Here is how the syntax will look like for laravel -   lt meta name   token  content     csrf token       gt    In your js file make sure to call this before sending the ajax call    ajaxSetup               headers                     X CSRF-TOKEN       meta name   token     attr  content                                Another way to solve it would be to change method from post to get

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As mentioned I think your return string data is very long  so the JSON format has been corrupted    There s other way for this problem  You should change the max size for JSON data in this way    Open the Web Config file and paste these lines into the configuration section   lt system web extensions gt     lt scripting gt       lt webServices gt         lt jsonSerialization maxJsonLength  50000000   gt       lt  webServices gt     lt  scripting gt   lt  system web extensions gt

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A 500 from ASP NET probably means an unhandled exception was thrown at some point when serving the request   I suggest you attach a debugger to the web server process  assuming you have access    One strange thing  You make a POST request to the server  but you do not pass any data  everything is in the query string   Perhaps it should be a GET request instead   You should also double check that the URL is correct

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I was able to find the solution using the Chrome debugger  I don t have Firebug or other third-party tools installed    Go to developer tab  CTRL MAJ I  Network   click on the request which failed  in red   Preview   It showed me that I had a problem on the server  when I was returning a value which was self-referencing

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I had this problem because the page I called ajax post from had EnableViewState  false  and EnableViewStateMac  false  but not the page called    When I put this on both pages everything started to work  I suspected this when I saw MAC address exception

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Your code contains dataType  json   In this case jQuery evaluates the response as JSON and returns a JavaScript object  The JSON data is parsed in a strict manner  Any malformed JSON is rejected and a parse error is thrown  An empty response is also rejected   The server should return a response of null or    instead

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in case if someone using the codeigniter framework  the problem may be caused by the csrf protection config enabled

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I run into the same thing today  As suggested before get Firebug for Firefox  Enable Console and preview POST response  That helped me to find out how stupid the problem was  My action was expecting value of a type int and I was posting string    ASP NET MVC2

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You can also get that error in VB if the function you re calling starts with Public Shared Function rather than Public Function in the webservice   As might happen if you move or copy the function out of a class   Just another thing to watch for

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This is Ajax Request Simple Code To Fetch Data Through Ajax Request    ajax       type   POST       url   InlineNotes Note ashx       data     id       noteid           contentType   application json  charset utf-8       dataType   json       success  function data            alert data d              error  function data           alert  fail

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I experienced a similar compound  error  which required two solutions   In my case the technology stack was  MVC  ASP NET   IIS  JQuery    The server side was failing with a 500 error  and this was occurring before the request was handled by the controller making the debug on the server side difficult   The following client side debug enabled me to determine the server error   In the    ajax error call back  display the error detail to the console    error   error    gt                         console log JSON stringify error           This at least  enabled me to view the initial server error     The JSON request was too large  to be serialized     This was resolved in the client web config    lt appSettings gt       lt add key  aspnet MaxJsonDeserializerMembers  value  150000    gt    However  the request still failed  But this time with a different error that I was now able to debug on the server side     Request Entity too large     This was resolved by adding the following  to the service  web config   lt configuration gt        lt system serviceModel gt       lt bindings gt         lt basicHttpBinding gt           lt binding maxBufferSize  2147483647  maxReceivedMessageSize  2147483647  maxBufferPoolSize  524288  gt             lt readerQuotas maxDepth  32  maxStringContentLength  2147483647              maxArrayLength  2147483647  maxBytesPerRead  2147483647  maxNameTableCharCount  2147483647     gt           lt  binding gt         lt  basicHttpBinding gt       lt  bindings gt    The configuration values may require further tuning  but at least it resolved the server errors caused by the ajax post

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For me  the error was in php file to which i was sending request  Error was in database connectivity  After fixing the php code  error resolved

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I just face this problem today  with this kind of error  you won t get any responses from server  therefore  it s very hard to locate the problem   But I can tell you  500 internal server error  is error with server not client  you got an error in server side script  Comment out the code closure by closure and try to run it again  you ll soon find out you miss a character somewhere

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As an addition to the  malformed JSON  answer  if the query you are running returns an object or anything that prevents the data to be serialised  you will get this error  You should always be sure you have JSON and only JSON at the end of your action method or whatever it is you are getting the data from

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Usually your property is not completely right or something wrong with your server processing

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There should be an event logged in the EventVwr  Warning from asp net   which could provide you more details on where the error could be

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Your return string data can be very long    lt system web gt              lt compilation debug  true  targetFramework  4 0    gt      lt httpRuntime maxRequestLength  2147483647    gt   lt  system web gt    For example     1 Char   1 Byte  5 Char   5 Byte  Hakki    5 Byte

[javascript] JQuery Ajax Post results in 500 Internal Server Error

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