Using Selenium Webdriver and Browsermob Proxy through a corporate proxy

04 Jan 2012 | By Matt Robbins | Tags testing capybara webdriver selenium browsermob

Browsermob Proxy proxy is a really useful tool that enables the user to effectively have an add-on api to ‘out of the box’ Selenium Webdriver which enables you to do things such as set header values, dump out har data etc. There is also a Ruby binding maintained as a separate gem which can be found here.

The problem I had was how to use this through/behind a corporate proxy, obviously it works by starting Firefox with a profile pointing to the browsermob proxy, which would then need to be told to navigate through a corporate proxy/firewall.

It turns out that the Java project does support this in Beta 4 and is documented here. Note this feature is not currently in the released binary (Beta 3) so you will need to ‘git clone’ the project and ‘mvn install’ to generate the jar file.

I then added a crude monkey patch which can be seen below, obviously when the next Beta of the Java code is released I can hopefuly submit a pull request for the Gem, which will be more elegant and better thought out, but for now if you need the hack here is the code:

require 'rubygems'
require 'bundler/setup'
require 'selenium/webdriver'
require 'browsermob/proxy'

#Patch required for proxy support - note: proxy support only added in beta-4 (not yet released as binary) and the patch is required for the gem to use this
#functionality.  Once beta-4 is released (Java Code) then a pull request could be submitted for the Gem.
module BrowserMob
  module Proxy
    class Client
      def self.from(server_url)
        port = JSON.parse(
, "proxy?httpProxy=myproxyhost:80").to_s, '')

        uri = URI.parse(File.join(server_url, "proxy", port.to_s))
        resource = resource,, port

server ="/Users/robbim02/dev/utils/browsermob-proxy-2.0-beta-3/bin/browsermob-proxy") #=> #<BrowserMob::Proxy::Server:0x000001022c6ea8 ...>


proxy = server.create_proxy #=> #<BrowserMob::Proxy::Client:0x0000010224bdc0 ...>

profile = #=> #<Selenium::WebDriver::Firefox::Profile:0x000001022bf748 ...>
profile.proxy = proxy.selenium_proxy

driver = Selenium::WebDriver.for :firefox, :profile => profile

proxy.new_har "google"
driver.get ""

har = proxy.har #=> #<HAR::Archive:0x-27066c42d7e75fa6>
har.entries.first.request.url #=> ""
har.save_to "tmp/google.har"


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