Abstract: Methods, non-transitory computer readable media, network traffic manager apparatuses, and systems that assist with managing hypertext transfer protocol (HTTP) requests using extended SYN cookie includes establishing a network connection with a client without allocating a plurality of computing resources to the established network connection, in response to aa request to establish a connection from a client. Presence of a digital signature in a first data packet comprising a request for a webpage is determined. The digital signature is compared to a plurality of stored signatures to determine when the client is a nefarious computing device when the determination indicates that the received request includes the signature. The established network connection is terminated with the client without allocating the plurality of computing resources when the comparison indicates the client is the nefarious computing device.