You're just referring to the mod_rewrite feature in apache... It takes this: http://www.mailmate.be/bcn.jpg?imagx=6.4891.1927023596
And rewrites it as: http://www.mailmate.be/imagx/6.4891.1927023596/bcn.jpg -----Original Message----- From: DDB Lists [mailto:[EMAIL PROTECTED]] Sent: Monday, January 13, 2003 10:59 AM To: CF-Talk Subject: Re: web beacons I got images like this: <img src="http://www.mailmate.be/imagx/6.4891.1927023596/bcn.jpg";> this contains the mail id, the person's id and a checksum digit Server side is a url rewriting mechanism that changes the link to imagx.cfm?linkid=... &img=bcn.jpg and then a cold fusion page to take care of the rest ----- Original Message ----- From: "Justin Greene" <[EMAIL PROTECTED]> To: "CF-Talk" <[EMAIL PROTECTED]> Sent: Monday, January 13, 2003 7:54 PM Subject: RE: web beacons > The more sophisticated web bugs do not use a parameter, but instead actually > use the filename itself to identify the individual and each email has > a different image being requested. Quite effective in HTML email and > on web pages. > > Justin > > > -----Original Message----- > > From: Lee Fuller [mailto:[EMAIL PROTECTED]] > > Sent: Monday, January 13, 2003 1:24 PM > > To: CF-Talk > > Subject: RE: web beacons > > > Yep.. One of the ways that spammers, these days, collect info on > > valid email addresses when using HTML email campaigns. You simply > > view the email, and > > BAM.. they know your email address is good. > > > > Old news > > > > > > > > | -----Original Message----- > > | From: Costas Piliotis [mailto:[EMAIL PROTECTED]] > > | Sent: Monday, January 13, 2003 10:04 AM > > | To: CF-Talk > > | Subject: RE: web beacons > > | > > | > > | Oh yeah, and you can pass url parameters to that image as well... > > | So let's say you send an email to employeeid 145. > > | > > | You can add a parameter the the src of the gif file in the html > > | email you send him as such: > > | > > | <img src="http://www.myserver.com/image.cfm?id=145";> > > | > > | Then in the source... Of image.cfm, something like this > > | appears: <cfcontent file="foo.gif" type="application/whatever"> > > | <cfquery datasource="#application.ds#"> insert into someTable > > | (employeeid, date) values (#val(url.id)#, getdate()) > > | </cfquery> > > | > > | -----Original Message----- > > | From: Costas Piliotis > > | Sent: Monday, January 13, 2003 10:00 AM > > | To: CF-Talk > > | Subject: RE: web beacons > > | > > | > > | Easy. > > | > > | <cfcontent file="foo.gif" type="application/whatever"> <cfquery > > | datasource="#application.ds#"> ...tracking query here... > > | </cfquery> > > | > > | You include the image, and some server-side code to process it. > > | Done it a few times... > > | > > | -----Original Message----- > > | From: sebastian palmigiani [mailto:[EMAIL PROTECTED]] > > | Sent: Monday, January 13, 2003 9:52 AM > > | To: CF-Talk > > | Subject: web beacons > > | > > | > > | Yahoo is using something called web beacons. Can anyone simply > > | explain how a single pixel gif is used as a web beacon. > > | > > http://privacy.yahoo.com/privacy/us/pixels/details.html > > > > > > Sebastian > > > > > > > > > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Archives: http://www.houseoffusion.com/cf_lists/index.cfm?forumid=4 Subscription: http://www.houseoffusion.com/cf_lists/index.cfm?method=subscribe&forumid=4 FAQ: http://www.thenetprofits.co.uk/coldfusion/faq Get the mailserver that powers this list at http://www.coolfusion.com Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4
![http://www.mailmate.be/imagx/6.4891.1927023596/bcn.jpg"](http://www.mailmate.be/imagx/6.4891.1927023596/bcn.jpg"){kind=link}