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This is a handy program that decodes HTTP and WebSocket traffic. It usesnode_pcap. Install it with:
npm install http_trace
Usagehttp_trace [options]
Capture options: -i <interface> interface name for capture (def: first with an addr) -f <pcap_filter> packet filter in pcap-filter(7) syntax (def: all TCP packets) -b <buffer> size in MB to buffer between libpcap and app (def: 10)HTTP filtering: Filters are OR-ed together and may be specified more than once. Show filters are applied first, then ignore filters. --method <regex> show requests with this method --method-ignore <regex> ignore requests with this method --host <regex> show requests with this Host header --host-ignore <regex> ignore requests with this Host header --url <regex> show requests with this URL --url-ignore <regex> ignore requests with this URL --user-agent <regex> show requests with this UA header --user-agent-ignore <regex> ignore requests with this UA headerHTTP output: --headers print headers of request and response (def: off) --bodies print request and response bodies, if any (def: off) --tcp-verbose display TCP events (def: off) --no-color disable ANSI colors (def: pretty colors on)Examples: http_trace -f "tcp port 80" listen for TCP port 80 on the default device http_trace -i eth1 --method POST listen on eth1 for all traffic that has an HTTP POST http_trace --host ranney --headers matches ranney in Host header and prints req/res headers
Screenshot
The TCP tracker innode_pcap looks for HTTP at the beginning of every TCP connection.If found, all captured data on this connection will be fed to node's HTTP parser and events will be generated.http_trace has listeners for these events and will print out some helpful information.
If a WebSocket upgrade is detected,http_trace will start looking for WebSocket messages on that connection.
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Live HTTP and WebSocket packet capture and protocol decoding