browsermob-proxy
Advanced tools
First see browsermob-proxy
Finally grok HAR files
OK - now you're on the right track!
var Proxy = require('browsermob-proxy').Proxy
, proxy = new Proxy()
, fs = require('fs');
proxy.doHAR('http://yahoo.com', function(err, data) {
if (err) {
console.error('ERROR: ' + err);
} else {
fs.writeFileSync('yahoo.com.har', data, 'utf8');
}
});
You need to tell the Proxy() constructor where browsermob-proxy is running. The defaults are running on 'localhost' port 8080:
proxy = new Proxy();
Starting browsermob-proxy somewhere else?:
proxy = new Proxy({ host: 'some.other.host', port: <some other port> });
Optionally Specifying a fixed Proxy Port
When you create new proxies, browsermob-proxy can automatically choose which port to open them on.
Alternatively, you can specify the port you expect proxes to be created on when you create the proxy object by setting it here:
proxy = new Proxy({ proxyPort: <some other port> });
N.B. You can also specify a port when using the doHAR or cbHAR functions for more fine tuned control
Ports passed to doHAR / cbHAR take override any proxyPort set here. And if no proxy port is set here or passed to those functions, then browsermob-proxy will fall back to automatcially choosing a port and reporting to the user the host:port on which the proxy has been created.
Optionally Specifying Selenium Host & Port
IF using Selenium you can specify the host and port. The defaults are 'localhost' port 4444:
proxy = new Proxy({ selHost: 'some.other.host', selPort: <some other port> });
Bandwidth Limits
In the Proxy constructor you can specify bandwidth and latency limitations like so:
var proxy = new Proxy( { downstreamKbps: 56, upstreamKbps: 56, latency: 200 } );
Would tell the proxy to act like a 56K modem with 200ms latency.
You need to install and start the browsermob-proxy:
% /bin/sh bin/browsermob-proxy
You also need to use either Selenium OR CasperJS
Get the latest 'selenium-server-standalone' JAR (currently 2.20.0) and start it where Firefox is available:
% java -jar selenium-server-standalone-2.20.0.jar
Grab the latest version of CasperJS
doHAR(URL, CALLBACK)
Generate HAR data in one-shot - expects Selenium to be running somewhere - if not running on 'localhost' port 4444 you need to tell it otherwise via the Proxy constructor 'selHost' and 'selPort':
proxy = new Proxy({ selHost: 'some.other.host', selPort: <some other port> }); // If not at localhost:4444
PARAMETERS
* URL URL is page to get HAR data for
* CALLBACK(ERROR, HAR) function
1. ERROR string if there was an error
2. HAR string data
* (optional) PROXY_PORT - port on which proxy will be available (If passed then this port will override any proxyPort set in configuration when creating the proxy)
EXAMPLE:
var Proxy = require('browsermob-proxy').Proxy;
, proxy = new Proxy();
proxy.doHAR('http://yahoo.com', function(err, data) {
if (err) {
console.error('ERROR: ' + err);
} else {
fs.writeFileSync('yahoo.com.har', data, 'utf8');
}
});
cbHAR(OPTIONS, GENERATE_TRAFFIC_CALLBACK, HAR_CALLBACK)
Convenience method to get HAR data - this method allows you to generate whatever traffic you like (via the CALLBACK), and then generate the HAR file.
PARAMETERS
* OPTIONS is an object with keys 'proxyPort', 'name', 'captureHeaders', 'captureContent' and 'captureBinaryContent'; 'proxyPort' the port number on which this proxy should be available (If passed then this port will override any proxyPort set in configuration when creating the proxy); 'name' is an arbitrary name for this run - like 'yahoo.com' or whatever you like; 'captureHeaders', 'captureContent' and 'captureBinaryContent' expect booleans indicating whether to capture resp headers, body of http transactions, and binary body of transactions. For backwards compatibility reasons, if OPTIONS is a string, it will be interpreted as the name for the run.
* GENERATE_TRAFFIC_CALLBACK(PROXY, DONE_CALLBACK)
PARAMETERS
* PROXY is the proxy you must use which is a string of the form '<hostname>:<port>'. All traffic you generate that you want to be part of the HAR must use this proxy! That is the whole point of this thing.
* DONE_CALLBACK is the function you call when you are done generating traffic and are ready to generate the HAR file.
* HAR_CALLBACK(ERROR, HAR) function
1. ERROR string if there was an error
2. HAR string data
EXAMPLE
var Proxy = require('browsermob-proxy').Proxy
, webdriverjs = require("webdriverjs")
, fs = require('fs')
, proxy = new Proxy()
;
proxy.cbHAR('search.yahoo.com', doSeleniumStuff, function(err, data) {
if (err) {
console.error('ERR: ' + err);
} else {
fs.writeFileSync('stuff.har', data, 'utf8');
}
});
function doSeleniumStuff(proxy, cb) {
var browser = webdriverjs.remote({
host: 'localhost'
, port: 4444
, desiredCapabilities: { browserName: 'firefox', seleniumProtocol: 'WebDriver', proxy: { httpProxy: proxy } }
});
browser
.init()
.url("http://search.yahoo.com")
.setValue("#yschsp", "javascript")
.submitForm("#sf")
.end(cb);
}
Note you MUST use 'firefox' or 'ie' browser and note how I set the Selenium proxy to go thru browsermob-proxy. I have both Selenium server standalone and browsermob-proxy running on localhost on their default ports (4444 and 8080 respectively).
Here is an example using CasperJS - no Selenium required! - you pass the path to a CasperJS script to the provided 'bin/runCasper.js' script and all of its interactions will be captured:
% bin/runCasper.js casperScript.js
The 'runCasper.js' script is part of this package.
Here is a sample CasperJS script:
var casper = require('casper').create();
casper.start('http://search.yahoo.com/', function() {
this.fill('form#sf', { "p": 'javascript' }, false);
this.click('#yschbt');
});
casper.run(function() {
this.exit();
});
Here is it put all together:
% node bin/runCasper.js searchYahooCasper.js
This will dump a HAR file named: 'searchYahooCasper.js.har' in the current directory.
You can control the browsermob-proxy directly if you want even finer-grained control using methods mapped directly to its REST interface. Here is an example:
var webdriverjs = require("webdriverjs")
, Proxy = require('browsermob-proxy').Proxy
, fs = require('fs')
, proxyHost = 'localhost'
;
var proxy = new Proxy( { host: proxyHost });
proxy.start(function(err, data) {
if (!err) {
// SET AND OVERRIDE HTTP REQUEST HEADERS IF YOU WANT TO
var headersToSet = {
'User-Agent': 'Bananabot/1.0',
'custom-header1': 'custom-header1-value',
'custom-header2': 'custom-header2-value'
}
proxy.addHeader(data.port, headersToSet, function (err,resp) {
if(!err) {
proxy.startHAR(data.port, 'http://localhost:8004', function (err, resp) {
if (!err) {
// DO WHATEVER WEB INTERACTION YOU WANT USING THE PROXY
doSeleniumStuff(proxyHost + ':' + data.port, function () {
proxy.getHAR(data.port, function(err, resp) {
if (!err) {
console.log(resp);
fs.writeFileSync('output.har', resp, 'utf8');
} else {
console.err('Error getting HAR file: ' + err);
}
proxy.stop(data.port, function() {});
});
});
} else {
console.error('Error starting HAR: ' + err);
proxy.stop(data.port, function () {
});
}
});
} else {
console.error('Error setting the custom headers');
proxy.stop(data.port, function () {
});
}
});
} else {
console.error('Error starting proxy: ' + err);
}
});
function doSeleniumStuff(proxy, cb) {
var browser = webdriverjs.remote({
host: 'localhost'
, port: 4444
, desiredCapabilities: { browserName: 'chrome', seleniumProtocol: 'WebDriver', proxy: { httpProxy: proxy } }
});
browser
.testMode()
.init()
.url("http://search.yahoo.com")
.setValue("#yschsp", "javascript")
.submitForm("#sf")
.tests.visible('#resultCount', true, 'Got result count')
.saveScreenshot('results.png')
.end(cb);
}
In this example I am manually controlling the browsermob-proxy - the convenience methods 'doHAR' and 'cbHAR' do most of this stuff for you so use them!
The sequence is
start([ PORT ], [ TRUSTALLCERTS ], CALLBACK)
Initializes a proxy
PARAMETERS:
* an optional PORT parameter specifying which port to open up a proxy on - if not provided browsermob will pick one.
* an optional TRUSTALLCERTS parameter is a boolean value specifying whether to trust all upstream SSL certificates irrespective of their validity - if not provided will default to false
* CALLBACK(ERROR, DATA) function
1. ERROR string if there was an error
2. DATA object whose only member is 'port' - the port the proxy is listening on
startHAR(PORT, [ NAME, CAPTUREHEADERS, CAPTURECONTENT, CAPTUREBINARYCONTENT ], CALLBACK)
Instructs the proxy listening on the given port to start generating the HAR - after this call all traffic thru this proxy will become part of the HAR
PARAMETERS:
* PORT of proxy for this command
* Optional NAME for this HAR
* Optional boolean CAPTUREHEADERS to record HTTP headers
* Optional boolean CAPTURECONTENT to record content of the requests
* Optional boolean CAPTUREBINARYCONTENT to record binary content
* CALLBACK(ERROR) function
1. ERROR string if there was an error
getHAR(PORT, CALLBACK)
Gets the current HAR for the proxy on PORT
PARAMETERS:
* PORT of proxy for this command
* CALLBACK(ERROR, HAR) function
1. ERROR string if there was an error
2. HAR string
stop(PORT, CALLBACK)
Stops the proxy on PORT
PARAMETERS:
* PORT of proxy for this command
* CALLBACK(ERROR) function
1. ERROR string if there was an error
limit(PORT, LIMIT_OBJ, CALLBACK)
Sets bandwidth and latency limits for proxy on PORT
PARAMETERS:
* PORT of proxy for this command
* LIMIT_OBJ an object with 3 possible keys: downloadKbps, uploadKbps, and latency. Any set keys will be set on the specified proxy port
* CALLBACK(ERROR) function
1. ERROR string if there was an error
newPage(PORT, NAME, CALLBACK)
Sets a new page name for the HAR listening on PORT
PARAMETERS:
* PORT of proxy for this command
* NAME new name for the HAR report
* CALLBACK(ERROR) function
1. ERROR string if there was an error
addHeader(PORT, HEADERSTOSET, CALLBACK)
Set and override HTTP Request headers
PARAMETERS:
* PORT of proxy for this command
* Headers to set
* CALLBACK(ERROR) function
1. ERROR string if there was an error
remapHosts(PORT, {'example.com': '1.2.3.4'}, CALLBACK)
Overrides normal DNS lookups and remaps the given hosts with the associated IP address
Payload data should be json encoded set of name/value pairs (ex: {'example.com': '1.2.3.4'})
PARAMETERS:
* PORT of proxy for this command
* Hosts to remap
* CALLBACK(ERROR) function
1. ERROR string if there was an error
rewrite(PORT, REWRITE_OBJ, CALLBACK)
Redirecting URL's for proxy on PORT
PARAMETERS:
* PORT of proxy for this command
* REWRITE_OBJ an object with 2 mandatory keys: matchRegex and replace. Any set keys will be set on the specified proxy port
* CALLBACK(ERROR) function
1. ERROR string if there was an error
filterRequest(PORT, FILTER_DATA, CALLBACK)
Allows intercepting requests for proxy on PORT
PARAMETERS:
* PORT of proxy for this command
* FILTER_DATA string with code to intercept requests. Javascript request filters have access to the variables `request` (type io.netty.handler.codec.http.HttpRequest), `contents` (type net.lightbody.bmp.util.HttpMessageContents), and `messageInfo` (type net.lightbody.bmp.util.HttpMessageInfo). `messageInfo` contains additional information about the message.
* CALLBACK(ERROR) function
1. ERROR string if there was an error
filterResponse(PORT, FILTER_DATA, CALLBACK)
Allows intercepting responses for proxy on PORT
PARAMETERS:
* PORT of proxy for this command
* FILTER_DATA string with code to intercept responses. Javascript response filters have access to the variables `response` (type io.netty.handler.codec.http.HttpResponse), `contents` (type net.lightbody.bmp.util.HttpMessageContents), and `messageInfo` (type net.lightbody.bmp.util.HttpMessageInfo). As in the request filter, `messageInfo` contains additional information about the message.
* CALLBACK(ERROR) function
1. ERROR string if there was an error
FAQs
Javascript bindings for the browsermob-proxy
The npm package browsermob-proxy receives a total of 3,217 weekly downloads. As such, browsermob-proxy popularity was classified as popular.
We found that browsermob-proxy demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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