Force Plain Text Format in Internet Explorer WITHOUT Registry Hack [SOLVED]

Internet Explorer uses MIME sniffing to parse pages and will erroneously render the following page as html:
header('Content-Type: text/plain');
echo '<body>';
echo '<span style="font-size:600%;">';
echo 'normal <strong>bold</strong>';
echo '</span>';
To force Internet Explorer to render the page as plain text, add the following before any text is output:
header('Content-Type: text/plain');
echo '                                                  ';
echo '                                                  ';
echo '                                                  ';
echo '                                                  ';
echo '                                                  ';
echo "\n";
Example: The following will render as plain text in Internet Explorer:
header('Content-Type: text/plain');
echo '                                                  ';
echo '                                                  ';
echo '                                                  ';
echo '                                                  ';
echo '                                                  ';
echo "\n";
echo '<body>';
echo '<span style="font-size:600%;">';
echo 'normal <strong>bold</strong>';
echo '</span>';
Or simply:
header('Content-Type: text/plain');
echo str_repeat(' ', 250) . "\n";
echo '<body>';
echo '<span style="font-size:600%;">';
echo 'normal <strong>bold</strong>';
echo '</span>';
UPDATE: Sending the X-Content-Type-Options response header will stop MIME-sniffing.
header('X-Content-Type-Options: nosniff');
Did this help you? Please let me know with a comment. Thank you
Posted .

2 comments (RSS)

  1. anonymous

    Thanks, just what I was looking for.

  2. anonymous

    As used in wordpress:

    /**

    * Send a HTTP header to disable content type sniffing in browsers which support it.

    *

    * @link http://blogs.msdn.com/ie/archive/2008/07/02/ie8-security-part-v-comprehensive-protection.aspx

    * @link http://src.chromium.org/viewvc/chrome?view=rev&revision=6985

    *

    * @since 3.0.0

    * @return none

    */

    function send_nosniff_header() {

        @header( 'X-Content-Type-Options: nosniff' );

    }

    http://core.svn.wordpress.org/trunk/wp-includes/functions.php

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