比如下面同一件商品的前后两条请求，只有ua字段不一致，但ua貌似很复杂，肯定隐藏了一些检测信息，可以猜出是什么编码吗？
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http://ext.mdskip.taobao.com/extension/dealRecords.htm?_ksTS=1397730109807_2952&callback=jsonp2953&bid_page=1&page_size=15&is_start=false&item_type=b&ends=1398274377000&starts=1397669577000&item_id=38113608066&user_tag=839979040&old_quantity=2228&seller_num_id=263726286&isFromDetail=yes&totalSQ=5400&sbn=caede0ccf3b864c5d0a2910b3e9aa3f0&sold_total_num=5413&ua=213fCJmZk4PGRVHHxtNZngkZ3k%2BaC52PmgTKQ%3D%3D%7CfyJ6Zyd9OGYlYXcpaXslYxI%3D%7CfiB4D15%2BZH9geTp%2FJyN8PDJtLAkJFwdOXlldbEU%3D%7CeSRiYjNhIHA3dGE2cm01dWsqczF2MXNmNXhoMHdpLHczaCpqej8W%7CeCVoaEASTB1cBBNMFBBMQF9JEkoTUhIAQQwZXAFWQlQEMB0%3D%7CeyR8C0gHRQBBARVBGQxVGQRbCU8SUgoVQgYMUREJSgVPEFB5Ag%3D%3D%7CeiB4D14fQRlbHBZBGQ5QFgMtEw%3D%3D%7CdS11AlMSTBBUExlGBBBQFghMGjUB%7CdCx0A1ITTRJQExlPAhJPFwhMH11pRA%3D%3D%7Cdy93AFEQThJXGhBGBRdPFwpLGVwHKgM%3D%7Cdi52AVARTxFXERtNDxhAGAVCEVsBLAU%3D%7CcShwB1YXSXs8eGsgZXUobx5BEkwHVQ0aSQUQSmMS%7CcChscC98InklYHIkfGkwc3M0ezpjP3J4J39uLmxsLnlW&
http://ext.mdskip.taobao.com/extension/dealRecords.htm?_ksTS=1397730333971_2860&callback=jsonp2861&bid_page=1&page_size=15&is_start=false&item_type=b&ends=1398274377000&starts=1397669577000&item_id=38113608066&user_tag=839979040&old_quantity=2228&seller_num_id=263726286&isFromDetail=yes&totalSQ=5400&sbn=caede0ccf3b864c5d0a2910b3e9aa3f0&sold_total_num=5419&ua=072fCJmZk4PGRVHHxtEb3EtbnA3YSd%2FN2EaIA%3D%3D%7CfyJ6Zyd9OGYlYXQhYHItYBE%3D%7CfiB4D15%2BZH9geTp%2FJyN8PDJtLAkJFwdOXlldbEU%3D%7CeSRiYjNhIHA3dGE2cWU8fGMpcDJ1NnJlN3dpNnpjIHU2bC5peSp8Bw%3D%3D%7CeCVoaEATTRJUDBtEHBgYIm9wNGoxbSskHkIdEw94eit7T2I%3D%7CeyR8C0gHRQBBARVBGQxXEAVaCE4TUwsUQwcNUBAISwROEVF4Aw%3D%3D%7CeiN7DF0cQnAxcWQ3b38iCwtIB1ccQAESQQV%2BTw%3D%3D%7CdS11AlMSTBRUFwBLDhtAAgJGEFIPIgs%3D%7CdC11AlMSTH44dGUua3gkYmIndjRzNm57LGtjOndoLHokfDh%2FdSNhGloeHk8OUAFDBRctBA%3D%3D%7Cdy9rdyh7JX4iZ3Uje243dHQzfD9vM350ImEa&
http://ext.mdskip.taobao.com/extension/dealRecords.htm?_ksTS=1397730109807_2952&callback=jsonp2953&bid_page=1&page_size=15&is_start=false&item_type=b&ends=1398274377000&starts=1397669577000&item_id=38113608066&user_tag=839979040&old_quantity=2228&seller_num_id=263726286&isFromDetail=yes&totalSQ=5400&sbn=caede0ccf3b864c5d0a2910b3e9aa3f0&sold_total_num=5413&ua=213fCJmZk4PGRVHHxtNZngkZ3k%2BaC52PmgTKQ%3D%3D%7CfyJ6Zyd9OGYlYXcpaXslYxI%3D%7CfiB4D15%2BZH9geTp%2FJyN8PDJtLAkJFwdOXlldbEU%3D%7CeSRiYjNhIHA3dGE2cm01dWsqczF2MXNmNXhoMHdpLHczaCpqej8W%7CeCVoaEASTB1cBBNMFBBMQF9JEkoTUhIAQQwZXAFWQlQEMB0%3D%7CeyR8C0gHRQBBARVBGQxVGQRbCU8SUgoVQgYMUREJSgVPEFB5Ag%3D%3D%7CeiB4D14fQRlbHBZBGQ5QFgMtEw%3D%3D%7CdS11AlMSTBBUExlGBBBQFghMGjUB%7CdCx0A1ITTRJQExlPAhJPFwhMH11pRA%3D%3D%7Cdy93AFEQThJXGhBGBRdPFwpLGVwHKgM%3D%7Cdi52AVARTxFXERtNDxhAGAVCEVsBLAU%3D%7CcShwB1YXSXs8eGsgZXUobx5BEkwHVQ0aSQUQSmMS%7CcChscC98InklYHIkfGkwc3M0ezpjP3J4J39uLmxsLnlW&
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