CODEWITHSUNDEEP
jqueryajaxrestcorsaccess-control
Sudarsan San
Sudarsan San

Reputation: 33

How to solve no 'Access-Control-Allow-Origin' header is present on the requested resource

CORS: A very common issue that most of the developers face when they hit a rest service from another domain and so do I.

I get this error :

No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8080' is therefore not allowed access.

Below is the jsp snippet.

<html>
<head>
<meta content="text/html; charset=utf-8">
<title>AJAX JSON SAMPLE</title>
<script type="application/javascript">	
function load() 
{ 
   var url = "https://samplewebapp1.herokuapp.com/rest/json/get";//use any url that have json data 
   var request; 
   if(window.XMLHttpRequest){   
    request=new XMLHttpRequest();//for Chrome, mozilla etc 
   }   
   else if(window.ActiveXObject){   
    request=new ActiveXObject("Microsoft.XMLHTTP");//for IE only 
   }   
   request.onreadystatechange  = function(){ 
      if (request.readyState == 4  ) 
      { 
        var jsonObj = JSON.parse(request.responseText);//JSON.parse() returns JSON object 
        document.getElementById("appName").innerHTML =  jsonObj.appName; 
        document.getElementById("language").innerHTML = jsonObj.language; 
      } 
   } 
   	request.open("GET", url, true); 
	request.send();  
} 
</script>
</head>
<body>
	appName:
	<span id="appName"></span>
	<br /> language:
	<span id="language"></span>
	<br />
	<button type="button" onclick="load()">Load Information</button>

</body>

</html>

Below is the rest service implementation of that service.

`package com.heroku.rest;
 import java.util.Date;
 import javax.ws.rs.GET;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
 import javax.ws.rs.core.MediaType;

 import com.heroku.model.Heroku;

 @Path("/json")
 public class HerokuRestService {

 @GET
 @Path("/get")
 @Produces(MediaType.APPLICATION_JSON)
 public Heroku getTrackInJSON() {
         return new Heroku("My First Heroku", "Java", new Date().toString());
    }    }`

What am i missing.?

Upvotes: 3

Views: 30044

Answers (1)

Ramkishore V S
Ramkishore V S

Reputation: 124

You are trying to do a XmlHttpRequest to some other domain. You could simply use CORS to tell your browser to allow it. (It's completely browser specific due to some security reasons).

https://chrome.google.com/webstore/detail/allow-control-allow-origi/nlfbmbojpeacfghkpbjhddihlkkiljbi?hl=en-US use this extension to allow access to no 'access-control-allow-origin' header request.

Or, you could manually configure CORS as well. Like described here https://www.html5rocks.com/en/tutorials/cors/

Upvotes: 1

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