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Editorial Team
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Asked: 2026-05-31T19:17:10+00:00

I had request.env[‘http_host’] working on localhost, but it causes an error when referenced in

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I had request.env['http_host'] working on localhost, but it causes an error when referenced in a layout page on heroku.

This request works in a view and displays the correct base url, but it causes an error when I move the code to the layout. Note – I’m using this to build absolute urls for images in html emails. 

  <%= "#{request.env['HTTP_HOST']}/assets/email_header_image.png" %> 
  <%= image_tag "#{request.env['HTTP_HOST']}/assets/email_header_image.png" %>

error received: 

ActionView::Template::Error (undefined method `env' for nil:NilClass):
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1 Answer

  1. Editorial Team

    If you want the host without the port, just use:

    request.host

    edit: Oops, I’ve just noticed that you’re using the code in the view. I don’t know if it is visible over there, I’ve only used it in controllers, but that’s fairly simple to overcome by setting an instance variable.

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