urllib3.exceptions.LocationValueError: No host specified.

Hi there.

First of all many thanks to all people involved in this project.

I’m facing an issue with version 1.25.2 of this library, which is not happening with version 1.24.1.

Steps to reproduce:

1. Create “requirements.txt” with below content:

selenium
urllib3==1.24.1
#urllib3==1.25.2

1. Create “Dockerfile” with below content:

FROM python:3-stretch

ADD requirements.txt .

RUN pip install -r requirements.txt

COPY test.py /test.py

1. Create “test.py” with below content:

#!/usr/bin/python

from selenium import webdriver

host = 'selenium'
port = '4444'
url = host + ':' + port + '/wd/hub'

desired_capabilities = {
    'browserName': 'firefox',
    'javascriptEnabled': True,
}

driver = webdriver.Remote(command_executor = url, desired_capabilities =
                                                          desired_capabilities)
print('Success')
driver.quit()

1. Create “docker-compose.yaml” with below content:

services:

 urllib3:
  container_name: urllib3
  build:
   context: .
  stdin_open: true
  tty: true

 selenium:
  container_name: selenium
  image: selenium/standalone-firefox
  # Mandatory, to avoid "Message: Failed to decode response from marionette" error
  shm_size: 128m

1. Bring up the environment

docker-compose up -d --build

1. Test it:

docker exec -ti urllib3 python /test.py

Expected output:

Success

1. Now edit “requirements.txt”

vim requirements.txt

And specify version 1.25.2 of urllib3:

selenium
#urllib3==1.24.1
urllib3==1.25.2

1. Bring down the environment

docker-compose down

1. Bring up the environment

docker-compose up -d --build

1. Test it:

docker exec -ti urllib3 python /test.py

Expected output:

Traceback (most recent call last):
  File "test.py", line 15, in <module>
    desired_capabilities)
  File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 157, in __init__
    self.start_session(capabilities, browser_profile)
  File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 252, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)
  File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/webdriver.py", line 319, in execute
    response = self.command_executor.execute(driver_command, params)
  File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/remote_connection.py", line 374, in execute
    return self._request(command_info[0], url, body=data)
  File "/usr/local/lib/python3.7/site-packages/selenium/webdriver/remote/remote_connection.py", line 402, in _request
    resp = http.request(method, url, body=body, headers=headers)
  File "/usr/local/lib/python3.7/site-packages/urllib3/request.py", line 72, in request
    **urlopen_kw)
  File "/usr/local/lib/python3.7/site-packages/urllib3/request.py", line 150, in request_encode_body
    return self.urlopen(method, url, **extra_kw)
  File "/usr/local/lib/python3.7/site-packages/urllib3/poolmanager.py", line 315, in urlopen
    conn = self.connection_from_host(u.host, port=u.port, scheme=u.scheme)
  File "/usr/local/lib/python3.7/site-packages/urllib3/poolmanager.py", line 222, in connection_from_host
    raise LocationValueError("No host specified.")
urllib3.exceptions.LocationValueError: No host specified.

1. (Optional) Cleanup

docker-compose down
docker rmi localhost/urllib3:latest

[sethmlarson]

(Also I suspect you can fix your issue by adding http:// to the beginning of your URL)

[AndreiPy13]

When i change http://selenium:4444/wd/hub on http://X.X.X.X:4444/wd/hub it working