The present solution provides a variety of techniques for accelerating and optimizing network traffic, such as HTTP based network traffic. The multi-path detection circuit has generating means for generating a logic pattern of a correlated peak in the delay profile, and removing means for removing a power component of the detected correlated peak from the delay profile using the logical pattern of the correlated peak generated by the generating means. Foreign matter will be prevented from adhering to the flat washer and the bolt head.