Greg Lindholm wrote:
There is nothing in a request that will tell you which page you came from unless you put it there (as with the hidden parameter).
While this is mostly true, it's not 100% true. HTTP has a "referer" (yes, misspelled in the spec) field so most of the time you can know from where a link came or a post was posted (assuming this value is provided by the browser). Note, all it provides is the URL of that previous page, so if that's not specific enough you're still SOL.
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