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This plugin allows one to set the Content-Type header for any Txp page. This allows you to (for example) serve up a valid RSS feed from a standard page template.
Information page: http://www.dev.michaelgravel.com/text/plugin-mg_setheader
Credit where it’s due:
The code for this was gleaned from a post Sencer contributed to in the Txp forum. So, just for clarity: I did some minor tweaks to his code and made it available. Enjoy.