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Editorial Team
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Asked: 2026-06-17T11:21:20+00:00

I generate a captcha image (as a .bmp) on the fly with a server

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I generate a captcha image (as a .bmp) on the fly with a server side script (.asp).

It is included in a page as follows:

<iframe id="commentCaptcha" height="20px" width="50px" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" src="/inc_captcha.asp">

Everything works as it should.

The problem/Question is that I get the following warning in the google chrome console:

Resource interpreted as Document but transferred with MIME type image/bmp: "/inc_captcha.asp".

Here are the actual raw headers returned from the server:

HTTP/1.1 200 OK
Cache-Control: no-cache
Pragma: no-cache
Content-Type: image/bmp
Expires: Sun, 13 Jan 2013 03:11:36 GMT
Server: Microsoft-IIS/7.5
Date: Sun, 13 Jan 2013 03:12:36 GMT
Connection: close

Is there any way I can prevent this warning?

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1 Answer

  1. Editorial Team

    Setting the source of the iframe to a non-document mine-type is a little strange and not really the usual way of doing it.

    Instead the iframe should have the src set to a text/HTML document, your image being an <img> within that document.

    If it’s just the image you’re after, use the <img> tag in the parent document and dont use an iframe at all.

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