mod_expires/4286: ExpiresByType using mod_expires uses AddType source for mime/types and not mime.types declarations

[Thomas Bolioli <we...@musicyellowpages.com>]

>Number:         4286
>Category:       mod_expires
>Synopsis:       ExpiresByType using mod_expires uses AddType source for mime/types and not mime.types declarations
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    apache
>State:          open
>Class:          doc-bug
>Submitter-Id:   apache
>Arrival-Date:   Wed Apr 21 12:40:02 PDT 1999
>Last-Modified:
>Originator:     webmaster@musicyellowpages.com
>Organization:
apache
>Release:        1.2.6
>Environment:
BSD/OS musicyellowpages.com 3.1 BSDI BSD/OS 3.1 Virtual Kernel #17: Tue Dec 22 1
0:30:12 MST 1998     root:/usr/src/sys/compile/VKERN  i386
>Description:
Below is a portion of our httpd.conf. The FYI I left others in my org. should explain every thing in context better than a diatribe from me. After that is the text/* segment of our mime.types file.

ServerName www.musicyellowpages.com
AddType text/x-server-parsed-html .shtml
AddType application/x-httpd-cgi .cgi
AddType application/x-httpd-cgi .pl
AddType text/x-server-parsed-html .html
AddType text/x-server-parsed-html .htm
AddType text/x-server-parsed-html .inc

ExpiresActive on
ExpiresByType application/x-httpd-cgi A120
ExpiresByType text/x-server-parsed-html "access plus 120 seconds"
# Doesn't work
# ExpiresByType text/html A120
###FYI undocumented quirk: mod_expires uses the initial mime/type for the
# file and not the served mime/type. ie; since we are using *.htm
# in place of *.shtml, our internal mime/type is parsed (via addtype)
# however the output is just text/html since this is derived from the
# file mime.types
# In other words AddType overrides mime.types declarations when dealing
# with a file internally yet fails to override those declarations in
# the header sent to the client. mod_expires doesn't pull mime/types from
# mime.types or at least not until it has checked the current env. for
# AddType declarations.

ExpiresByType text/html A120
# OK, it works but not on *.htm, *.html, *.inc, *.cgi, and *.pl exts.
# Maybe, we should use *.shtml for static pages
# Header append Cache-Control must-revalidate

# mime.types file segment
text/html                      html htm
text/x-sgml                     sgml sgm
text/plain                     txt
text/richtext                  rtx
text/tab-separated-values      tsv
text/x-setext                  etx
>How-To-Repeat:
use *.htm and *.html as a text/server-parsed-html mime/type using AddType directive as above. Then use ExpiresByType text/html A###. The output headers will show Content-Type: text/html but no Expires: header.
>Fix:
Just document it with the mod_expires directives and if this is more serious than I think it is, put it onto the "Maybe Tommorrow, TODO list".
>Audit-Trail:
>Unformatted:
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