Python Selenium 2.39 and Firefox 26

Question

im trying to execute some selenium with unittest scripts but i get the following error

Starting at: "Sat Dec 07 14:43:17 2013"
E
======================================================================
ERROR: test_template (__main__.ManageTemplates)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "template.py", line 70, in tearDown
    self.driver.quit()
  File "C:\Program Files (x86)\Python27\lib\site-packages\selenium-2.38.1-py2.7.egg\selenium\webdriver\firefox\webdriver.py", line 66, in quit
    RemoteWebDriver.quit(self)
  File "C:\Program Files (x86)\Python27\lib\site-packages\selenium-2.38.1-py2.7.egg\selenium\webdriver\remote\webdriver.py", line 454, in quit
    self.execute(Command.QUIT)
  File "C:\Program Files (x86)\Python27\lib\site-packages\selenium-2.38.1-py2.7.egg\selenium\webdriver\remote\webdriver.py", line 162, in execute
    response = self.command_executor.execute(driver_command, params)
  File "C:\Program Files (x86)\Python27\lib\site-packages\selenium-2.38.1-py2.7.egg\selenium\webdriver\remote\remote_connection.py", line 350, in execute
    return self._request(url, method=command_info[0], data=data)
  File "C:\Program Files (x86)\Python27\lib\site-packages\selenium-2.38.1-py2.7.egg\selenium\webdriver\remote\remote_connection.py", line 381, in _request
    self._conn.request(method, parsed_url.path, data, headers)
  File "C:\Program Files (x86)\Python27\lib\httplib.py", line 973, in request
    self._send_request(method, url, body, headers)
  File "C:\Program Files (x86)\Python27\lib\httplib.py", line 1001, in _send_request
    self.putrequest(method, url, **skips)
  File "C:\Program Files (x86)\Python27\lib\httplib.py", line 871, in putrequest
    raise CannotSendRequest()
CannotSendRequest

----------------------------------------------------------------------
Ran 1 test in 766.686s

FAILED (errors=1)

the errors accure in template.py at line 70 in tearDown() function, which is a default unittest function autogenerated with Selenium-IDE

def tearDown(self):
    self.driver.quit()
    self.assertEqual([], self.verificationErrors)

---

EDIT:

This Problem happened when i updated Firefox to 26, even when i updated to selenium 2.39.0 the problem didnt go away

---

Source:

import unittest
from os import path
from config import config
from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from PyWebBotClass import PyWebBot
from selenium.webdriver.support.ui import WebDriverWait
from selenium.common.exceptions import TimeoutException
from os import listdir, environ
from os.path import isfile, join
import time

class ManageReceivers(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Firefox()
        self.driver.implicitly_wait(10)
        self.base_url = config['baseurl']
        self.verificationErrors = []
        self.accept_next_alert = True

    def setup_bot(self, f):
        self.bot = PyWebBot(self.driver, path.join(config['configs'],f))
        self.bot.set_LogPath(config['LogPath'])
        self.bot.set_ScreenshotPath(config['screenshots'])
        self.bot.set_ConfigBaseURL(config['baseurl'])

    def test_receiver_profile(self):
        self.imported = False
        for f in listdir(config['configs']):
            if isfile(join(config['configs'],f)):
                self.setup_bot(f)
                if not self.imported:
                    self.bot.gotourl('csv2db/import_db_1')
                    self.imported = True
                self.bot.goto('login')
                self.bot.JS__fillform('login')
                self.bot.goto('receiver_profile')
                self.bot.JS__fillform('receiver_profile')
                try:
                    self.bot._driver.execute_script("var e = $('.icon-zoom-in'); e[e.length-1].click()")
                except:
                    print "unable to access selector id = view"
                    pass
                try:
                    self.bot._driver.execute_script("var e = $('.icon-pencil'); e[e.length-1].click()")
                except:
                    print "unable to access selector id = edit"
                    pass

                self.bot.JS__fillform('receiver_profile')
                self.bot.goto('logout')

    def is_element_present(self, how, what):
        try: self.driver.find_element(by=how, value=what)
        except NoSuchElementException, e: return False
        return True

    def close_alert_and_get_its_text(self):
        try:
            alert = self.driver.switch_to_alert()
            if self.accept_next_alert:
                alert.accept()
            else:
                alert.dismiss()
            return alert.text
        finally: self.accept_next_alert = True

    @classmethod
    def setUpClass(cls):
        environ['NO_PROXY'] = '127.0.0.1'  # IP-address of Jenkins server

    def tearDown(self):
        self.driver.quit()
        self.assertEqual([], self.verificationErrors)


if __name__ == '__main__':
    print('Starting at: "%s"' % time.asctime())
    unittest.main()
    print('Finished at: "%s"' % time.asctime())

Answer 1

i solved the problem in this way

Get a portable version of Firefox from here (get a version which was working with you for example i got Firefox version 23) and extract it to specific directory

import os 
from selenium import webdriver
from selenium.webdriver.firefox.firefox_binary import FirefoxBinary

binary = FirefoxBinary(os.path.join('Pathto','FirefoxPortable','FirefoxPortable.exe'))
driver = webdriver.Firefox(firefox_binary=binary)

this has been tested with selenium 2.37.2 and 2.39.0

Enjoy!

Answer 2

From what I can tell, this error is caused by the browser being shut down/killed/crashing and selenium being unable to handle the response that comes back (empty response). I included the details here:

How to deal with sporadic BadStatusLine, CannotSendRequest errors in python WebDriver

But it's a pretty common situation where firefox versions and selenium versions are incompatible. I would just pick the most stable versions and stick to those.