Posted about 1 year ago. Visible to the public.

Headless Chrome: Changing the Accept-Language header is not possible

It seems like changing the HTTP_ACCEPT_LANGUAGE is not possible for a headless chrome.

  • On Ubuntu the headless Chrome derives the Accept-Language from the operation system
  • Adding the option options.add_argument('--lang=de') to the Capybara::Selenium::Driver has no effect
  • Adding the preference options.add_preference('intl.accept_languages', 'de') to the Capybara::Selenium::Driver has only effects if the --headless option is skipped (see bug ticket #775911 Archive )
  • Changing the request header in Capybara only works without Selenium

You still can add logic to your application code that helps to modify the Accept-Language in tests. Here is an example for a Rails application with Cucumber integration tests:

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class ApplicationController OVERRIDE_HTTP_ACCEPT_LANGUAGE = nil def accept_language OVERRIDE_HTTP_ACCEPT_LANGUAGE || request.env['HTTP_ACCEPT_LANGUAGE'].to_s end end
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# Override the Accept-Language header for all Cucumber scenarios Before do stub_const('ApplicationController::OVERRIDE_HTTP_ACCEPT_LANGUAGE', 'de') end

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Owner of this card:

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Emanuel De
Last edit:
about 1 year ago
by Emanuel De
About this deck:
We are makandra and do test-driven, agile Ruby on Rails software development.
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Posted by Emanuel De to makandra dev
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