#   lists all media (MIME) types registered with the IANA, but unfortunately
#   many script types (especially proprietary ones) have not registered with
#   them, and that list doesn't specify which types are script content anyway.
@SCRIPT_MIME_TYPES= ('application/x-javascript', 'application/x-ecmascript',
		     'application/x-vbscript',   'application/x-perlscript',
		     'application/javascript',   'application/ecmascript',
		     'text/javascript',  'text/ecmascript', 'text/jscript',
		     'text/livescript',  'text/vbscript',   'text/vbs',
		     'text/perlscript',  'text/tcl',
		     'text/x-scriptlet', 'text/scriptlet',
		     'application/hta',
		    ) ;



# All MIME types in @SCRIPT_MIME_TYPES and @OTHER_TYPES_TO_REGISTER will be
#   "registered".  Registration helps the script remember which MIME type is
#   expected by a page when downloading embedded URLs, e.g. style sheets.  Any
#   MIME types that need special treatment should be listed here if they're not
#   already in @SCRIPT_MIME_TYPES.
# If you write a handler for a new MIME type in proxify_block(), and that type
#   isn't already listed in @SCRIPT_MIME_TYPES, then add it here.
# The Perl code in this program supports up to 64 registered MIME types, but
#   the JS _proxy_jslib_pack_flags() and _proxy_jslib_unpack_flags() routines
#   only support 26.  Thus, fix the JS code if there's ever more than 26 types.
# "text/xml" is a special case-- it's used to support the JavaScript class
#   XMLHttpRequest .  Data downloaded through that should not be proxified,
#   even if it's HTML data; it's proxified later when it's added to a document.
#   Using the "text/xml" type is part of avoiding that first proxification.
@OTHER_TYPES_TO_REGISTER= ('text/css', 'text/xml') ;


# These are MIME types that we *may* try to rewrite in proxify_block(), e.g.
#   to send all URLs back through this script.  If a type isn't on this list,
#   then we know for certain it should be sent back to the user unchanged,
#   which saves time.
# If you write a handler for a new MIME type in proxify_block(), then add the
#   type here.
# NOT all the types here are actually supported at this time!
# text/html is not on this list because currently it's handled specially.
@TYPES_TO_HANDLE= ('text/css',
		   'application/x-javascript', 'application/x-ecmascript',
		   'application/javascript',   'application/ecmascript',
		   'text/javascript',          'text/ecmascript',
		   'text/livescript',          'text/jscript',
		  ) ;


# This is a list of all file extensions that will be disallowed if
#   $TEXT_ONLY is set.  It's an inexact science.  If you want to ban
#   other file extensions, you can add more to this list.  Note that
#   removing extensions from this list won't necessarily allow those
#   files through, since there are other ways $TEXT_ONLY is implemented,
#   such as only allowing MIME types of text/* .
# The format of this list is one long string, with the extensions
#   separated by "|".  This is because the string is actually used as
#   a regular expression.  Don't worry if you don't know what that means.
# Extensions are roughly taken from Netscape's "Helper Preferences" screen
#   (but that was in 1996).  A more complete list might be made from a
#   mime.types file.
$NON_TEXT_EXTENSIONS=
	  'gif|jpeg|jpe|jpg|tiff|tif|png|bmp|xbm'   # images
	. '|mp2|mp3|wav|aif|aiff|au|snd'            # audios
	. '|avi|qt|mov|mpeg|mpg|mpe'                # videos
	. '|gz|Z|exe|gtar|tar|zip|sit|hqx|pdf'      # applications
	. '|ram|rm|ra|swf' ;                        # others


# This is now set directly in footer(), the only place it's used.
# $PROXY_VERSION= '2.1beta15' ;


#--------------------------------------------------------------------------
#   End of normal user configuration.
#   Now, set or adjust all globals that remain constant for all runs.
#--------------------------------------------------------------------------

# First, set various constants.

# These are used in rfc1123_date() and date_is_after().
@MONTH=   qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec) ;
@WEEKDAY= qw(Sun Mon Tue Wed Thu Fri Sat Sun) ;
%UN_MONTH= map { lc($MONTH[$_]), $_ }  0..$#MONTH ;   # look up by month name

# Create the sets of regular expressions we'll need if we proxify scripts.
# So far, the only script type we proxify is JavaScript.
&set_RE_JS  if $PROXIFY_SCRIPTS ;


# Next, make copies of any constant environment variables, and fix as needed.

# SERVER_PORT and SCRIPT_NAME will be constant, and are used in several places.
#   Besides, we need SCRIPT_NAME fixed before setting $THIS_SCRIPT_URL.
# SCRIPT_NAME should have a leading slash, but the old CGI "standard" from
#   NCSA was unclear on that, so some servers didn't give it a leading
#   slash.  Here we ensure it has a leading slash.
# Apache has a bug where SCRIPT_NAME is wrong if the PATH_INFO has "//" in it;
#   it's set to the script name plus all of PATH_INFO up until its final "//".
#   To work around this, truncate SCRIPT_NAME at the first place it matches $0.
#   PATH_INFO is also changed to collapse all multiple slashes into a single