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Editorial Team
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Asked: 2026-06-02T03:00:23+00:00

I have a simple .ajax post to a rails scaffold project running on Heroku:

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I have a simple .ajax post to a rails scaffold project running on Heroku:

<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js">    </script>
</head>
<body>
    <script>
    $(document).ready(function(){
        $.ajax({
            type: 'POST', url: "http://herokuserver/images.json",
            data: { image: { name: "johngalt1" } }
        });
    });
    </script>
</body>

As it turns out using the javascript console in Chrome I get:

 XMLHttpRequest cannot load http://herokuServer/images.json. Origin http://localhost:3000 is not allowed by Access-Control-Allow-Origin.

HOWEVER, when I go to the rails app on heroku a new record has been created with the name => “johngalt1”. From everything I’ve read I thought the cross-domain issue with javascript would have prevented the record being created and required me to use json-p or CORS? Or does the javascript cross-domain issue only prevent receiving data from a server via javascript?

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1 Answer

  1. Editorial Team

    It only prevents the browser from receiving data. So if you don’t need a response from this post, you should be ok.

    edit – when I’m developing locally, I create a rewrite rule for the Apache2 server on my mac to get around this limitation. it creates a reverse proxy that tricks the browser into allowing cross-domain requests.

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