<HTML> <HEAD> <TITLE>What Your Browser Says Behind Your Back</TITLE> </HEAD> <BODY> <PRE><TT> The what your browser told me about you when you weren't looking echo CGI at UIUC mentioned on cypherpunks (http://www.hks.net/cpunks/ cpunks-9/0095.html) in Nov. 1994 seems to be down for the count (it was http://www.uiuc.edu/cgi-bin/printenv )). It would provide you with a page showing the information your browser had given to the server in the HTTP Request-Header. However, others exist to take up the slack. Here's a directory I compiled today (thanks to WWWW, Lycos, etc.) of current, working HTTP Request-Header and resulting server environment variable echoes. I'm sure I've missed some, if not many. Follow up with additions, if you want. Better yet, add these and the additions to your favorite privacy and security pages. HTTP Request-Header Echoes Machine Information at MIT (http://www.mit.edu:8001/machine) Feeds back your machine name, IP address, and finger info. Not really a request-header echo at all, but useful. Echo at TU-Berlin (http://www.cs.tu-berlin.de/sui/eserte/cgi-rcs/home/ eserte/.public_html/index.html Raw text echo of your HTTP request-header info. Echo by Pierre Omidyar at best.com (http://www.best.com/~pierre/printenv. cgi) and at ebay.com (http://www.ebay.com/printenv.cgi) Two paths for reaching the same CGI script. Produces nicely formatted HTML output showing your HTTP request-header info. Simple perl source for the script is available from Pierre's Web Tips (http://www.best. com/~pierre/web-authoring.html) page. Echo by mjd at cis.upenn.edu (http://www.cis.upenn.edu/cgi-bin/mjd/ printenv) Produces formatted HTML echo of your HTTP request-header info. Echo at hyperreal.com (http://www.hyperreal.com/cgi-bin/printenv) Produces plaintext HTML echo of your HTTP request-header info. Echo at Whithead Institute--MIT (http://www-genome.wi.mit.edu/WWW/ examples/Ch9/printenv.pl Produces formatted HTML echo of your HTTP request-header info. Simple perl source for this script is available in the Chapter 9 script examples (http://www-genome.wi.mit.edu/WWW/examples/Ch9/) from Lincoln Stein (http://www-genome.wi.mit.edu/~lstein/)'s book, How to Set Up And Maintain a World Wide Web Site (http://www-genome.wi.mit. edu/WWW/). Echo by cloos at io.com (http://www.io.com/cgi-user/cloos/environment) Raw text echo of your HTTP request-header info. Also provides a whole bunch more, including the script's runtime environment. And now, again in the original HTML: </TT></PRE><BR> The <P><CENTER><STRONG><EM>what your browser told me about you when you weren't looking</EM></STRONG></CENTER> <P>echo CGI at UIUC <A HREF="http://www.hks.net/cpunks/cpunks-9/0095.html">mentioned on cypherpunks</A> in Nov. 1994 seems to be down for the count (it was http://www.uiuc.edu/cgi-bin/printenv). It would provide you with a page showing the information your browser had given to the server in the HTTP Request-Header.<BR> <BR> However, others exist to take up the slack. Here's a directory I compiled today (thanks to WWWW, Lycos, etc.) of current, working HTTP Request-Header and resulting server environment variable echoes. I'm sure I've missed some, if not many. Follow up with additions, if you want. Better yet, add these and the additions to your favorite privacy and security pages.<BR> <H3>HTTP Request-Header Echoes</H3> <DL> <DT>Machine Information at MIT <DD>Feeds back your machine name, IP address, and finger info. Not really a request-header echo at all, but useful. <DT><A HREF="http://www.cs.tu-berlin.de/sui/eserte/cgi-rcs/home/eserte/.public_html/index.html">Echo at TU-Berlin</A> <DD>Raw text echo of your HTTP request-header info. <DT><A HREF="http://www.best.com/~pierre/printenv.cgi">Echo by Pierre Omidyar at best.com</A> and at ebay.com <DD>Two paths for reaching the same CGI script. Produces nicely formatted HTML output showing your HTTP request-header info. Simple perl source for the script is available from <A HREF="http://www.best.com/~pierre/web-authoring.html">Pierre's Web Tips</A> page. <DT><A HREF="http://www.cis.upenn.edu/cgi-bin/mjd/printenv">Echo by mjd at cis.upenn.edu</A> <DD>Produces formatted HTML echo of your HTTP request-header info. <DT>Echo at hyperreal.com <DD>Produces plaintext HTML echo of your HTTP request-header info. <DT><A HREF="http://www-genome.wi.mit.edu/WWW/examples/Ch9/printenv.pl">Echo at Whithead Institute--MIT</A> <DD>Produces formatted HTML echo of your HTTP request-header info. Simple perl source for this script is available in the <A HREF="http://www-genome.wi.mit.edu/WWW/examples/Ch9/">Chapter 9 script examples</A> from <A HREF="http://www-genome.wi.mit.edu/~lstein/">Lincoln Stein</A>'s book, <CITE><A HREF="http://www-genome.wi.mit.edu/WWW/">How to Set Up And Maintain a World Wide Web Site</A></CITE>. <DT><A HREF="http://www.io.com/cgi-user/cloos/environment">Echo by cloos at io.com</A> <DD>Raw text echo of your HTTP request-header info. Also provides a whole bunch more, including the <EM>script's</EM> runtime environment. </DL> </BODY> </HTML>