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How can I get information about the user's browser?

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Contributed by Anonymous Monk on Jul 07, 2000 at 22:48 UTC
Q&A  > CGI programming


Description:

I have a simple socket server that I would like to add the capability to retreive info on the user. The problem is, connection is called from the html page using a image reference. How would I go about to getting user info. Like browser type and his IP.

Answer: How can I get information about the user's browser?
contributed by nardo

The web browser will send info about itself in the User-Agent line. A browser might send you something like:

GET / HTTP/1.0 Connection: Keep-Alive User-Agent: Mozilla/4.72 [en] (X11; U; Linux 2.2.16 i686) Host: localhost:1101 Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png +, */* Accept-Encoding: gzip Accept-Language: en Accept-Charset: iso-8859-1,*,utf-8
Answer: How can I get information about the user's browser?
contributed by wardk

using CGI.pm

use CGI; my $q = new CGI(); my $UserAgent = $q->user_agent(); ...
Answer: How can I get information about the user's browser?
contributed by ybiC

I'm not clear on what you mean by "called from the html page using a image reference", and this may not apply since you're using "a simple socket server", but I use the following environment variables from CGI.pm.

$ENV{'REMOTE_HOST'} $ENV{'REMOTE_ADDR'} $ENV{'HTTP_USER_AGENT'}

If this is what you're looking for, more info can be found at http://stein.cshl.org/WWW/software/CGI/.

No mater how you extract this info, it's trivially spoofed, so you shouldn't base any security on what browsers tell you about themselves.
    cheers,
    ybiC

Answer: How can I get information about the user's browser?
contributed by hacker

Or, slap this in a page and see the entire environment that is passed in the request:

use Env; print "<!--\n"; foreach $parameter ( sort keys %ENV ) { print "$parameter is: $ENV{$parameter}\n"; }
Answer: How can I get information about the user's browser?
contributed by sinan

Check out Environmental Variables for an program that lists the env. variables.

Answer: How can I get information about the user's browser?
contributed by cleen

yes, user-agent line, a web client will send a series of plain text lines that tell the server what types of files it accepts, what domain name its looking for (for ipless hosts), and included within that data is a line that is simply called the "User-Agent" line. Everything after the User-Agent: is the type of browser and operating system they are using.

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