html - No 'Access-Control-Allow-Origin' when serving javascript file to external sites -


my site provides javascript file users can include in site. javascript file in-turn calls applications endpoint , fetches content inputted users' div

this code js

(function(){     $(document).ready(function(){         var test = $('#foobar');         var id = test.data('id');         $.get('http://example.com/serve/'+id, function(data){             test.html(data);         });     }); })();

but when user references js file on own site, following error:

xmlhttprequest cannot load http://example.com/serve/qefz7tvglg. no 'access-control-allow-origin' header present on requested resource. origin 'http://localhost:8000' therefore not allowed access.

this sample html created test

<!doctype html> <html>     <body>         <div id="foobar" data-id="qefz7tvglg"></div>         <script src="https://code.jquery.com/jquery-2.2.0.min.js"></script>         <script src="http://example.com/scripts/myjsfile.js"></script>     </body> </html>

your server needs specify access-control-allow-origin header (probably *, means "all"). called cors.

to give naive example, here's how might in node.js:

app.use(function(req, res, next) {   res.header("access-control-allow-origin", "*");

edit

since server in grails, check out this question how enable cors.


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