Did you know that you can record raw HTTP communication of Curl command-line tool with the --trace and --trace-ascii option? It's the only way I know to get raw HTTP communication without using the tcpdump or wireshark. For example, this trick is very useful for the proper introspection into HTTP communication of an undocumented RESTful API. The only glitch is that cURL --trace saves data in its custom format, far from human-friendly, saving chunks as they are being received and splitting them by packets. If you want a human readable form then this parser is what you need. Delivered as a Node.js package.