# proxify > A versatile and portable proxy for capturing, manipulating, and replaying HTTP/HTTPS traffic on the go. > See also: `mitmproxy`. > More information: . - Start a HTTP proxy (on the loopback network interface `127.0.0.1` and port `8888`): `proxify` - Start a HTTP proxy on a custom network interface and port (may require `sudo` for a port number lower than `1024`): `proxify -http-addr "{{ip_address}}:{{port_number}}"` - Specify output format and output file: `proxify -output-format {{jsonl|yaml}} -output {{path/to/file}}` - Display help: `proxify -h`