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    <p>Simplest way to keep a session without using cookies is appending a unique hash (maybe a UUID or something similar) to the urls in the page as a get parameter:</p> <pre><code>/my/fancy/url </code></pre> <p>becomes</p> <pre><code>/my/fancy/url?HASHCODE </code></pre> <p>whenever the server receives a request, it capture the HASHCODE if present, otherwise it generates one, and then append it to all links on the served page.</p> <p>Please bear in mind that the user can manipulate the HASHCODE and you should take that into account when engineering your application.</p> <p>Anyway, notice that it's quite ugly in the fancy-url era. Also notice that user tracking is a delicate subject and you might incur into legal problems if you do not properly declare it in the TOS.</p> <p>EDIT: you <strong>cannot</strong> track a person across multiple web sites without using cookies in any of their variants (flash, session storage, etc.) and a domain shared between sites. No way, you cannot set a variable or cookie from one domain and access it from another one in any decent browser, otherwise it would be a big security hole.</p> <p>EDIT: Panopticlick cannot be used as a tracking method as you suggested, because it is based on statistical matching and it is also pretty bad at that (try browsing <a href="https://panopticlick.eff.org/" rel="nofollow">https://panopticlick.eff.org/</a> from outside the USA or with the just-released Chrome/Firefox update). It's a good proof concept, but nothing that you can use for this purpose. Also, you would need a whole lot of samples to get statistically relevant results.</p> <p>EDIT: Browser fingerprint identifying power is weak: many browsers are autoupdating (like Chrome or Firefox) and official builts are very few (20? 40? Maybe a bit more if you count Linux distribution-compiled ones), so you will find a consistent portion of users with the same user agent. Add that there is a pletora of consumer PCs with similar configurations.</p>
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    1. POgenerate fingerprint of client using javascript
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    1. USStefano Sanfilippo
    1. USStefano Sanfilippo
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    1. COThis would certainly work, but the fingerprint would be different anytime a user starts a new session
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    2. COSince he does not want to use cookies, there is no chance at all to keep ID across sessions.
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    3. CONot solely with javascript anyways
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