Retrieves a list of content types that the browser can accept.
Returns a list of content types as a comma-delimited string.
As information output on a page or to a log:
HTTP_ACCEPT=text/xml,application/xml,application/xhtml+xml,text/html; q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif; q=0.2,text/css,*/*;q=0.1
As part of an Idoc Script statement or evaluation:
<$if HTTP_ACCEPT$>
<!--statement-->