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AJAX POST request in Spring-MVC does not works

I am learning Spring MVC and I have stuck at how to send a simple string value from client using AJAX and print it at JAVA server (controller). I have written below code for doing this. But when I click button to send string, error.... response is popped-up in my browser and the browser console displays POST http://localhost:8090/addUser 404 (). It has been a day since I am trying to solve this issue. Can someone please tell what can be the problem? Or please tell a working alternative solution for sending data from client using AJAX and printing/saving it on JAVA server (Spring-MVC).
UserController.java
#Controller
public class UserController {
#RequestMapping(value = "/addUser", method = RequestMethod.POST, consumes=MediaType.APPLICATION_JSON_VALUE, produces=MediaType.APPLICATION_JSON_VALUE)
public JSONArray addUser(#ModelAttribute("UserTest") JSONArray name) {
System.out.println(name.toString());
return name;
}
}
AJAX Request:
<script>
function addUser() {
var json = '{"uname":"John", "Age":42}';
obj = JSON.parse(json);
$.ajax({
url : "/addUser",
data : obj,
type : "POST",
async: false,
contentType: "application/json",
success : function(response) {
alert( response );
},
error : function() {
alert("error...."); //this is being popped-up in my browser
}
});
}
</script>

POST http://localhost:8090/addUser 404 ()
Your request is going to http://localhost:8090/addUser, which is not correct. Your request url should have your application and included.
http://localhost:8090/<app_name>/addUser
AFAIK, your request url should have application name included. Now, to achieve this, you are suppose to change your ajax url
url : "/<app_name>/addUser"

The URL for the ajax call is not correct. It should be like
Url:YourApplicationContextPath/ControllerName/addUser

ASP.Net MVC 5 using jQuery Ajax unable to send __RequestVerificationToken

I am using MVC 5 with jQuery and am having difficulties with posting the anti forgery token using Ajax. i have looked on SO at various fixes, but nothing appears to work.
I have the following code within my view.
#using (Html.BeginForm("None", "None", FormMethod.Post, new { #id = "js-form" }))
{
#Html.AntiForgeryToken()
....
other code
....
<button class="button-primary button expand js-button-search" type="button">Search</button>
}
Then using jQuery I have added an event handler to the button above by selecting the element via the class: js-button-search. The main Ajax call is as per below
$.ajax({
url: url,
method: 'POST',
dataType: "json",
contentType: "application/json; charset=utf-8",
data: JSON.stringify(_self.JsonData),
success: function (result) {
// Success code
},
error: function (jqXHR, textStatus, errorThrown) {
// Failure code
}
});
Where my confusion is, is around the data parameter. I have an object which is populated on demand that contains a large amount of elements that can be used for searching.
The object takes the form of (shortened as we current have over 40 search fields):
_self.JsonData = { "searchData": {"DocIdFrom" : "426737", "DocIdTo" : "753675", "DocIdTypeSearch" : "between", "DocDateFrom" : "06/02/2017", "DocDateTo" : "", "DocDateTypeSearch" : "greater than", .....
etc...
}}
As you can see, the data is parsed using JSON.stringify. All of this work as long as the [ValidateAntiForgeryToken] attribute is commented out on the controller function.
Controller as follows:
[HttpPost]
//[ValidateAntiForgeryToken]
public JsonResult GetSearchResultsJson(SearchCriteria searchCriteria, int? page)
{
// code in here
}
When I uncomment the anti forgery attribute, the page stops working.
Now i know about the need to pass the token across with the post and have tried the following without success:
how-can-i-supply-an-antiforgerytoken-when-posting-json-data-using-ajax
asp-net-mvc-5-ajax-request-on-edit-page-error-requestverificationtoken-is-not
The main difference between what I have appears to be a complex object, but i think that is a red herring as Stringify converts the object into a string.
Sorry, forgot to add. Fiddler return the following message when the [ValidateAntiForgeryToken] is enabled
[Fiddler] ReadResponse() failed: The server did not return a complete response for this request. Server returned 0 bytes.

I would like to thank Stephen Muecke for providing the solution to the problem.
Firstly my Json object was converted to the following:
var data = { "__RequestVerificationToken":$('[name=__RequestVerificationToken]').val(),
"searchData":
{
"DocIdFrom" : "426737",
"DocIdTo" : "753675",
..............
etc
}
}
Then, I removed the contentType parameter from the Ajax call and stopped stingifying the Json data.
This has had the desired effect and now i can call the MVC controller using the [ValidateAntiForgeryToken] attribute.

You might pass RequestVerificationToken (AntiForgeryToken) on Ajax call by using one of the methods below:
Method I: When using serialize() or FormData() methods, it is not necessary to add the token to the data parameters separately (it will be included id the formdata parameter):
//Send the values of all form controls within the <form> tags including the token:
var formdata = $('#frmCreate').serialize();
//or
var formdata = new FormData($('#frmCreate').get(0));
Method II:
var token = $('[name=__RequestVerificationToken]').val();
$.post(url, { comment: comment, IssueID: postId, __RequestVerificationToken: token },
function (data) { … })
Then you can use the Controller as shown below:
[HttpPost]
[ValidateAntiForgeryToken]
public JsonResult AddComment(string comment, int IssueID){
//...
}

Ajax data not reaching backend C# code

Below is the code which i m trying to send. As you can see, ajax call is made at UI and data 'sub' is passed through. this 'sub' has an array of objects in it. So data is present when it is passed.
UI SIDE
$scope.save = function () {
var sanit = $scope.gridOptions.rowData;
var sub = JSON.stringify(sanit);
$.ajax({
type: 'POST',
url: '/api/Pr/PM',
data: sub, //this has data in it
contentType: "application/json"
}).success(function (response) {
window.alert("Database updated successfully.");
})
};
However, when i debug the code at backend, the parameters is showing as null. i have commented the section showing this is null where the data is showing as null at the start of backend function.
BACKEND C# SIDE
[HttpPost]
public HttpResponseMessage PM([FromBody] string parameters) //this is null.
{
string message = string.Empty;
try
{
var model = JsonConvert.DeserializeObject<List<PODetails>>(parameters);
message = "Insert Successfull";
return Request.CreateResponse(HttpStatusCode.OK, message);
}
catch (Exception ex)
{
message = "Insert fail";
return Request.CreateErrorResponse(HttpStatusCode.NoContent, message);
}
}
Can someone please let me know why it is showing as null value at backend.

You need to ensure the data you're sending via AJAX is an object with a single parameter, which should be named the exact same as the parameter your backend is expecting.
In this case:
$.ajax({
type: 'POST',
url: '/api',
data: JSON.stringify({ parameters: sub }),
contentType: "application/json"
}).success(function (response) {
...
})
Next, if the variable "sub" is an array of objects then you must create a class model server side to match the structure of the data being sent. Then, your API's interface should be expecting a list of that newly created class.
For example:
[HttpPost]
public HttpResponseMessage PM(List<YourClassModel> parameters)
{
...
}
Your API should now be able to receive and read the data being sent via the AJAX call above.

Take a look at this: Post a json object to mvc controller with jquery and ajax
You are sending a list of objects but trying to recieve it as string. You should change your function parameter from (String parameters) to (List parameters) and change your ajax request according to the link above. That will probably solve your problem.
(ps: i couldn't try it myself that's why i said probably :) )

angularjs can't communicate with php using POST

I am trying to send and then get data from PHP on my server, but I don't think it sends the data.
My js code:
angular
.module('h2hApp', [])
.controller('mainCtrl', ['$scope', '$http', function(scope, http) {
scope.initGames = function() {
http({
method: 'POST',
url: 'apis.php',
data: {
url: someUrl
}
})
.success(function(data) {
console.log(data);
});
};
scope.initGames();
}]);
and my PHP file:
<?php
$url = $_POST['url'];
echo file_get_contents($url);
?>
The only thing I get in response is that error:
Notice: Undefined index: url in /my/path/apis.php on line 2
I made this working using jQuery but with AngularJS it doesn't seem to work. I'm new to Angular and I read some other problems like this. I tried things like adding headers and other things but nothing worked.

You can be forgiven for thinking that your PHP script should be expecting data in the $_POST variable as encoding your data as a query string has traditionally always been the default mechanism.
Angular however encodes the message body as a JSON object by default. As mentioned you could use the params instead however in the long run I'd argue that it's more flexible to conform on the server-side. For example you can read and decode the message body as follows:
<?php
$data = json_decode( file_get_contents('php://input') );
echo $data->url;

It should be 'params', not 'data'. See http://docs.angularjs.org/api/ng/service/$http#usage

Be sure to set the HTTP header, sort of like this:
$http.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded;charset=utf-8';
More info on using Post from AngularJS to PHP

You can use http.post() method -
Try this the code -
http.post('apis.php', {
url: someUrl
})
.success(function(data) {
console.log(data);
});

form serialize in ajax post with ckeditor throws ajax error

I am using ckeditor in our project. passing that value in ajax post like
//$form is -> $('form') jquery object
$("#ajaxsubmitbutton").on('click', function () {
CKupdate();
$.ajax({
type: ($form.attr('method').toLowerCase() == 'post' ? 'POST' : 'GET'),
url: ($form.attr('action') == 'undefined' ? window.location : $form.attr('action')),
data: $form.serialize(),
success: function (data) {
// Use local eval, since it will work in this context
callbackFunction(data);
},
error: function () {
var data = "ajaxerror";
callbackFunction(data);
}
});
});
Ckeditor update code :
function CKupdate(){
for ( instance in CKEDITOR.instances )
CKEDITOR.instances[instance].updateElement();
}
$form.serialize having below value :
"Id=0&Title=dfg&ShortText=rer&CultureCode=en-US&StartDate=3%2F12%2F2014&EndDate=3%2F26%2F2014&Text=%3Cp%3Etest3%3C%2Fp%3E%0D%0A"
controller code :
public JsonResult Save(int id, string title, string shortText, string text, DateTime? startDate, DateTime? endDate, string cultureCode)
{
//process some operation
}
it throws some ajax error like " 500 -internal server not found". i don't know what is the real cause for this issue
may be the problem in serializing the form. any help on this.

I suspect that the tags are the issue here-
Assuming Asp.net MVC here you have two options-
Decorate your model property with the [AllowHtml] method (not sure how much of a pain it would be to convert your properties to a model here)
Put the [ValidateInput(false)] tag on your controller method
You may need to add the following tag to system.web in your config as well
<httpRuntime requestValidationMode="2.0"/>
You may also run into issues if your submit isn't a post in which case you'll want to add allowget to your return value.
Not sure if this is your issue without the full error but that is where I'd start. You may want to check the response in fiddler or firebug to see if you can get more information on that exception.
Hope that helps.