Wireshark is the world’s foremost and widely-used network protocol analyzer. It lets you see what’s happening on your network at a microscopic level and is the de facto (and often de jure) standard across many commercial and non-profit enterprises, government agencies, and educational institutions. Wireshark development thrives thanks to the volunteer contributions of networking experts around the globe and is the continuation of a project started by Gerald Combs in 1998.
Suppose you are looking at an interesting HTTP file download in PCAP and want to extract the file. Click the PCAP download button and then open the pcap file with Wireshark.
To extract files from HTTP traffic, click File - Export Objects - HTTP.
Select the file(s) to save.
Specify where to save them.
Review the extracted file(s).