text/plain vs. text/txt

[falseazure]

Greetings, Monks.

I guess this is more of a web mime types/general cgi output question but it came up in a Perl cgi web app I am maintaining so I guess I will ask about it here.

In some cases the aforementioned app outputs plain text preceeded by "Content-type:text/plain", which I gather from looking into mime types is the web standard for transmitting plain text. But sometimes the app instead prints "Content-type:text/txt", which an initial google doesn't turn up much documentation or info about except that it looks like it sometimes appears in other Perl code too.

My questions are: does Content-type:text/txt have a distinct meaning or purpose as opposed to text/plain? Is it a standard? I don't see it on the mime types list (http://www.iana.org/assignments/media-types/) Should it be avoided/purged from my code and replaced with text/plain?

Thanks!

[ikegami]

It should be text/plain. People probably derived .txt ⇒ text/txt from .html ⇒ text/html. The harm done by this is minimal, but it would be nice to do things right.