: Long user agent field in HTTP header I have a HTTP sniffer application which runs on C++ , when I am getting the user agent field I get something like : Mozilla/5.0 (Windows NT 6.1; WOW655970812;
I have a HTTP sniffer application which runs on C++ ,
when I am getting the user agent field I get something like :
Mozilla/5.0 (Windows NT 6.1; WOW655970812; fr=0ea2JbE8UfOtMxCAb.AWUSc_K0DPt0NpgvgWvZVDCZzug.BSHX4S.8d.FIo.AWUtAj4s; xs=1%3AFOApj11sTU3NXA%3A0%3A1378405752%3A6395; sub=128; p=129; act=1378934556224%2F153; presence=EM378935116EuserFA21655970812A2EstateFDsb2F1378934519166Et2F_5b_5dElm2FnullEuct2F1378934511240EtrFA2close_5fescA2Etwlocale=tr_TR; c_user=1655970812; fr=0ea2JbE8UfOtMxCAb.AWUSc_K0DPt0NpgvgWvZVDCZzug.BSHX4S.8d.FIo.AWUtAj4s; xs=1%3AFOApj11sTU3NXA%3A0%3A1378405752%3A6395; sub=128; p=129; act=1378934556224%2F153; presence=EM378935116EuserFA21655970812A2EstateFDsb2F1378934519166Et2F_5b_5dElm2FnullEuct2F1378934511240EtrFA2close_5fescA2EtwF4219503720EatF1378934899190EwmlFDfolderFA2inboxA2Ethread_5fidFA2user_3a626679213A2CG378935116367CEchFDp_5f1655970812F195CC
This doesn't happens often, but still enough to cause problems in my customer's database.
It seems for sure I need to make a sanity check while getting this field and after getting this field.
My question if the user agent information above somehow meaningful. If not what might be the cause for such strange user agent field in request header.
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This UA string definitely looks broken -- I can say that this gibberish looks similar to content of the cookie header.
Most often reasons:
Fake UA (either used on purpose by some bot/script ... or it's a programmer mistake (or buggy library that was used) when whole request body and headers were assembled manually;
Your app got it somehow wrong.
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