Access Web API in jquery

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Hi Friends,

I am new to web api. I have created a sample project of WEB API and MVC 4 APP together. Now when I try to make a request as follows I get the error:

#jQuery code.

JavaScript

function GetAllEmployees() {
    jQuery.support.cors = true;
    console.log("Entered to GetAllEmployees");
    $.ajax({
        url: 'http://localhost:51848/api/EmployeeAPI',
        type: 'GET',
        dataType: 'json',
        success: function (data) {
            WriteResponse(data);
        },
        error: function (x, y, z) {
            alert(x + '\n' + y + '\n' + z);
        }
    });
}

XMLHttpRequest cannot load http://localhost:51848/api/EmployeeAPI. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:51789' is therefore not allowed access.

Please guide me:
1. why I am getting this error when both the web api and aap are in one solution.
2. I created the single web api project and hosted it on my local IIS server and still getting the same error.

Thanks :)

Posted 16-Jun-14 2:01am

Manish Kumar Namdev

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Akhil Mittal · Answer 1 · 2014-06-16T02:21:00

Add the below code in your web.config of your API under <system.webserver> tag

XML

<httpProtocol>
     <customHeaders>
       <add name="Access-Control-Allow-Origin" value="*" />
       <add name="Access-Control-Allow-Headers" value="Content-Type" />
       <add name="Access-Control-Allow-Methods" value="GET, POST, PUT, DELETE, OPTIONS" />
     </customHeaders>
   </httpProtocol>
   <validation validateIntegratedModeConfiguration="false" />
   <modules runAllManagedModulesForAllRequests="true">
     <remove name="WebDAVModule" />
   </modules>

wladimirbm · Answer 2 · 2014-06-16T23:25:00

if you want use only jQuery, you can create file.php with curl for you other path

in localhost:51789

JavaScript

function GetAllEmployees() {
    jQuery.support.cors = true;
    console.log("Entered to GetAllEmployees");
    $.ajax({
        url: 'http://localhost:51789/EmployeeAPI.php',
        type: 'GET',
        dataType: 'json',
        success: function (data) {
            WriteResponse(data);
        },
        error: function (x, y, z) {
            alert(x + '\n' + y + '\n' + z);
        }
    });
}

EmployeeAPI.php

PHP

<?php 

if( $curl = curl_init() ) {
    curl_setopt($curl, CURLOPT_URL, 'http://localhost:51848/api/EmployeeAPI');
    curl_setopt($curl, CURLOPT_RETURNTRANSFER,true);
    $out = curl_exec($curl);
    echo $out;
    curl_close($curl);
}
?>

Kornfeld Eliyahu Peter · Answer 3 · 2014-06-16T02:20:00

Solution 1

The problem is about same-origin policy[^]. It means that you can not make such call from one domain (localhost:51789) to other domain (localhost:51848).
You may set crossDomain to true on $.ajax, but the only certain solution is set Access-Control-Allow-Origin header on your target domain.
It also possible that you didn't mean to separate the API from the calling application, in which case you have to see why both are on different domains...

Posted 16-Jun-14 2:20am

Kornfeld Eliyahu Peter

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Manish Kumar Namdev 16-Jun-14 8:48am

I have put the both application in same solution. Shall I need to make both application's port same? I am not geeting why I am not able to access the API method. I checked in the properties both the application have two different port.

Kornfeld Eliyahu Peter 16-Jun-14 10:04am

Different port is a different domain as long as we talk about same-origin policy...

Access Web API in jquery

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