$ npm install httperfjs

:::js
var HTTPerf = require('httperfjs');

var httperf = new HTTPerf({
    "server": "mervine.net",
    "verbose": true,
    "hog": true,
    "uri": "/about",
    "num-conns": 100}
);

httperf.run(function (result) {
    console.log(result);
    console.log(result.connection_time_avg);
});
// => { object with httperf values }
// => '123.4'

httperf.parse = false;
var child = httperf.run(function (result) {
    console.log(result);
});
// => "string with httperf stdout"

// httperf dumps data on SIGINT (crtl-c), HTTPerf's run
// supports this as well, with the following addition
// to your scripts
process.on('SIGINT', function() {
    child.send('SIGINT');
});

:::js
// file: ./test/benchmark.js
var HTTPerf = require('httperfjs');
var httperf = new HTTPerf({
    server:      "mervine.net",
    uri:         "/",
    "num-conns": 9
});

var run;

module.exports = {
    tearDown: function (callback) {
        run = undefined;
        callback();
    },

    'homepage should be quick': function (test) {
        test.expect(1);
        httperf.run( function (run) {
            test.ok(run.connection_time_median < 200,
                "homepage was too slow: got "   run.connection_time_median
                     " but expected: < 200");
            test.done();
        });
    },

    'archive should be quick': function (test) {
        test.expect(1);
        httperf.run( function (run) {
            test.ok(run.connection_time_median < 200,
                "archive was too slow: got "   run.connection_time_avg
                      " but expected: < 200");
            test.done();
        });
    }
};
// $ ./node_modules/.bin/nodeunit ./test/benchmark.js

command
max_connect_burst_length
total_connections
total_requests
total_replies
total_test_duration
connection_rate_per_sec
connection_rate_ms_conn
connection_time_min
connection_time_avg
connection_time_max
connection_time_median
connection_time_stddev
connection_time_connect
connection_length
request_rate_per_sec
request_rate_ms_request
request_size
reply_rate_min
reply_rate_avg
reply_rate_max
reply_rate_stddev
reply_rate_samples
reply_time_response
reply_time_transfer
reply_size_header
reply_size_content
reply_size_footer
reply_size_total
reply_status_1xx
reply_status_2xx
reply_status_3xx
reply_status_4xx
reply_status_5xx
cpu_time_user_sec
cpu_time_system_sec
cpu_time_user_pct
cpu_time_system_pct
cpu_time_total_pct
net_io_kb_sec
net_io_bps
errors_total
errors_client_timeout
errors_socket_timeout
errors_conn_refused
errors_conn_reset
errors_fd_unavail
errors_addr_unavail
errors_ftab_full
errors_other

connection_time_75_pct
connection_time_80_pct
connection_time_85_pct
connection_time_90_pct
connection_time_95_pct
connection_time_99_pct

"add-header"
"burst-length"
"client"
"close-with-reset"
"debug"
"failure-status"
"hog"
"http-version"
"max-connections"
"max-piped-calls"
"method"
"no-host-hdr"
"num-calls"
"num-conns"
"period"
"port"
"print-reply"
"print-request"
"rate"
"recv-buffer"
"retry-on-failure"
"send-buffer"
"server"
"server-name"
"session-cookies"
"ssl"
"ssl-ciphers"
"ssl-no-reuse"
"think-timeout"
"timeout"
"uri"
"verbose"
"version"
"wlog"
"wsess"
"wsesslog"
"wset"