# mitmdump > View, record, and programmatically transform HTTP traffic. > The command-line counterpart to mitmproxy. > More information: . - Start a proxy and save all output to a file: `mitmdump -w {{path/to/file}}` - Filter a saved traffic file to just POST requests: `mitmdump -nr {{input_filename}} -w {{output_filename}} "{{~m post}}"` - Replay a saved traffic file: `mitmdump -nc {{path/to/file}}`