W3C home > Mailing lists > Public > www-talk@w3.org > March to April 1995

Re: distinguishing browser types

From: lilley <lilley@afs.mcc.ac.uk>
Date: Mon, 24 Apr 1995 11:05:18 +0100 (BST)
Message-Id: <1036.9504241005@afs.mcc.ac.uk>
To: nazgul@utopia.com
Cc: www-talk@www10.w3.org
First - I sent an unedited message to the list just now. Sorry. 
My mailer has just *one* question that does not take return, all 
the rest do :-P

Kee Hinckley wrote:
 
> Which leads me to another question. Are there any browsers out there that
> actually set the Accept fields based on the helper applications?  I know
> Netscape doesn't. It makes it rather difficult to determine what formats
> can be sent to a browser.

Arena (all versions that I have used, from 0.90 onwards) send out 
Accept: headers based on your .mailcap, but not the system wide mailcap,
for example

 HTTP........ Connected, socket 5
 HTTP Tx..... GET /hypertext/WWW/Arena/0.96 HTTP/1.0
 Accept: application/x-dvi; q=0.500
 Accept: video/*; q=0.500
 Accept: video/mpeg; q=0.500
 Accept: text/tab-separated-values; q=0.500
 Accept: image/x-png; q=0.500
 Accept: image/png; q=0.500
 Accept: application/applefile; q=0.500
 Accept: application/x-metamail-patch; q=0.500
 Accept: sun-deskset-message; q=0.500
 Accept: mail-file; q=0.500
 Accept: default; q=0.500
 Accept: postscript-file; q=0.500
 Accept: audio-file; q=0.500
 Accept: x-sun-attachment; q=0.500
 Accept: text/enriched; q=0.500
 Accept: text/plain; q=0.500
 Accept: text/richtext; q=0.500
 Accept: application/andrew-inset; q=0.500
 Accept: x-be2; q=0.500
 Accept: application/postscript; q=0.500
 Accept: message/external-body; q=0.500
 Accept: message/partial; q=0.500
 Accept: image/x-xwd; q=0.500
 Accept: image/*; q=0.500
 Accept: audio/basic; q=0.500
 Accept: audio/*; q=0.500
 Accept: */*; q=0.100
 Accept: application/x-compressed; q=0.100
 Accept: application/octet-stream; q=0.100
 Accept: text/x-html3; q=0.800
 Accept: text/html; level=3; q=0.900
 Accept: text/html; q=0.600
 Accept: image/x-xbitmap; q=0.600
 Accept: image/x-xpixmap; q=0.600
 Accept: image/jpeg; q=0.600
 Accept: image/gif; q=0.600
 Accept: text/plain; q=0.400
 User-Agent: Arena/0.96s  libwww/

Note that there are good quality factors for the HTML formats. I had 
thought it sent out the stuff from /usr/local/lib/mailcap too, but 
obviously not; a pity. Notice also the q factor for */*

It is difficult to see how a single q factor could effectively resolve
a situation with GIF and JPEG both available; JPG is better for many 
pictures, but GIF is better for some. Ah well, notice I have x-png 
in there :)

There are some wierd and non-standard accept lines in there, because 
the .mailcap was generated by metamail, which tries to understand 
sun mailtool stuff as well as MIME. Really I need more granularity 
than a single file for all applications.

--
Chris Lilley
+----------------------------------------------------------------------+
|Technical Author, Manchester and North HPC Training & Education Centre|
+----------------------------------------------------------------------+
| Computer Graphics Unit,             |  Email: Chris.Lilley@mcc.ac.uk |
| Manchester Computing Centre,        |  Voice: +44 61 275 6045        |
| Oxford Road, Manchester, UK.M13 9PL |    Fax: +44 61 275 6040        |
+-------------------------------------+ BioMOO: ChrisL                 |
|       URI: http://info.mcc.ac.uk/CGU/staff/lilley/lilley.html        | 
+----------------------------------------------------------------------+
|       "The first W in WWW will not wait."   François Yergeau         |
+----------------------------------------------------------------------+
Received on Monday, 24 April 1995 06:06:07 UTC

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