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USJames Corcoran
 

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    1. POOverriding Tomcat's method of getting sessionid from the request
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    1. CONote, though, that some JPEGs have neither 4A 46 49 46 nor 45 78 69 66 at that position (although most I've seen do). Not an expert on this stuff, but I'm looking at a JPEG that has 50 68 6F 74 at that position; that corresponds to the ASCII "Phot" in "Photoshop," although I've saved JPEGs in several ways from Photoshop and am not able to replicate this. (Photoshop, however, recognizes this file as a JPEG, as does Windows and OS X.) This file contains neither the JFIF nor the Exif markers ANYWHERE. Finally, the file DOES start with FF D8 and end with FF D9 (as it should since it's a JPEG).
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    2. COPlease note re @onemasse comment, though, that a lot of JPEGs are Exif, not JFIF, for example many JPEGs taken with digital cameras, many JPEGs saved from Photoshop (which means lots of JPEGs to be found on the web), etc. This is based on my personal experience, but there's more here: http://en.wikipedia.org/wiki/JPEG_File_Interchange_Format.
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    3. CO@Will Hartung - Very helpful, thanks. And yes, you're correct that we have to be careful about parsing params from the request that early in its lifecycle. I wouldn't use `getParameter()` for that reason; I'd just parse it out of the query string. (Which, as you also point out, means that my session id param can't be POSTed, but that's alright, since POST URLs can still have query strings appended.)
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      1. USJames Corcoran
 

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