Abstract— In recent, the diversity and scale of network traffic
has been expanding by the increase in various services and
applications. Studies of application-level traffic analysis have
been performed as the first step of the management and control
of network traffic. Many studies have been utilizing "User-
Agent" field in the HTTP header in order to analyze application-
level HTTP traffic. As a result, most of HTTP-based applications
can be classified with user-agent information, but some of HTTP
traffic cannot be analyzed since it does not include user-agent
field. In this paper, we use server-client correlation of HTTP
service in order to improve completeness of HTTP analysis.
Therefore, even though user-agent field does not exist in the
HTTP header, analysis of application-level can be accomplished.
We show our method feasibility through the experiment in a
campus network