Subject:
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Re: Cracking down on unauthorized image links
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Newsgroups:
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lugnet.admin.general
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Date:
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Fri, 4 Jun 1999 22:08:53 GMT
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Viewed:
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719 times
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Todd Lehman wrote:
> By the way: David, there is no way that an HTTP server can know the size of
> an image that a client/browser is expecting. That is, the HEIGHT and WIDTH
> attributes of the <IMG> tag are known only to the client/browser and to the
> originator of the HTML document.
>
> So in fact (unfortunately) it is not even possible to scale the image to an
> appropriate viewing size at the server end, even if bandwidth and CPU
> weren't an issue. But if an image is simple enough, the client can do its
> crude job of scaling it, and it'll still be readable enough.
Well, couldn't you have several JPEGs of various dimensions ready to go,
along with a database of the dimensions of the original images, and then
feed the one whose dimensions are closest to those of the requested image?
Actually, it probably doesn't matter that much -- my guess is that most
image-link pirates aren't going to bother coding the HEIGHT and WIDTH
anyway, since they'll just let eBay plop in the image link that they
enter on the listing form rather than coding the link themselves. Thus
the alternate images will usually appear with whatever dimensions you
give them, regardless of the dimensions of the original images that
they're replacing.
> I took David's suggestion of displaying a placeholder image in lieu of a
> broken image link. But I made it a simple static image, 200x200 pixels.
> The image depicts a sad face and gives a URL to go to for more information:
>
> http://www.lugnet.com/oops.gif
> http://www.lugnet.com/oops.html
Looks great, though I still think you could do more to capitalize
on the situation. (I probably overstated the value of this for
banner-style advertising, since you can't really turn the image
into a live hyperlink -- though I think you could attach a cookie
to it if you were so inclined. How often do you get the chance
to put an ad on someone else's web page, where only you have the
ability to change its content? Why not offer the space up to
competing eBay sellers, or Amazon.com or Yahoo! Auctions, or at
least AucZILLA?)
> I'm able to look at the HTTP server logs, BTW, to see where the unauthorized
> links are coming from, without ever having to go scan other sites. Here are
> some recent ones, for example:
>
> http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=113058082
> http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=113315714
> http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=113461949
>
> (Note: these URLs probably won't work after about a week, or may already
> have been fixed by the time you view them.)
I don't think that it's possible for sellers to delete text or links
from a listing; I believe that all they can do is add to it. Also,
I think that those links should work for 30 days after the end of each
auction.
- David
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Message has 2 Replies:
 | | Re: Cracking down on unauthorized image links
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| (...) Ah. Yes. I see. Given the filename of image that the client wanted (which could be extracted from the URL), the actual dimensions of the image could be looked up (quite easily, in fact). So, yes, I misspoke. In general, it's not possible for (...) (25 years ago, 5-Jun-99, to lugnet.admin.general)
| | | Re: Cracking down on unauthorized image links
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| (...) Yeah, I don't think they can change it after submitting, but at least from now on they should be able to tell immediately that their theft of server space and bandwidth isn't going to work. Seems the person from the third example got a little (...) (25 years ago, 7-Jun-99, to lugnet.admin.general)
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Message is in Reply To:
| | Re: Cracking down on unauthorized image links
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| (...) By the way: David, there is no way that an HTTP server can know the size of an image that a client/browser is expecting. That is, the HEIGHT and WIDTH attributes of the <IMG> tag are known only to the client/browser and to the originator of (...) (25 years ago, 4-Jun-99, to lugnet.admin.general)
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