# httpflow > A command-line utility to capture and dump HTTP streams. > More information: . - Capture traffic on all interfaces: `httpflow -i {{any}}` - Use a bpf-style capture to filter the results: `httpflow {{host httpbin.org or host baidu.com}}` - Use a regular expression to filter requests by URLs: `httpflow -u '{{regular_expression}}'` - Read packets from pcap format binary file: `httpflow -r {{out.cap}}` - Write the output to a directory: `httpflow -w {{path/to/directory}}`