@INPROCEEDINGS{7056844, author={Calzarossa, M. C. and Massari, L.}, booktitle={High Performance Computing and Communications, 2014 IEEE 6th Intl Symp on Cyberspace Safety and Security, 2014 IEEE 11th Intl Conf on Embedded Software and Syst (HPCC,CSS,ICESS), 2014 IEEE Intl Conf on}, title={Analysis of Header Usage Patterns of HTTP Request Messages}, year={2014}, pages={847-853}, keywords={Internet;Web sites;computer network security;transport protocols;HTTP request messages;Web browsers;Web robots;client preferences;header usage patterns;message headers;network protocols;security attacks;website customization;Browsers;IP networks;Monitoring;Robots;Security;Web servers;HTTP header usage patterns;HTTP traffic;Web robots;measurements;packet sniffer;statistical techniques;traffic characterization}, doi={10.1109/HPCC.2014.146}, month={Aug},}