# request.env\['HTTP\_USER\_AGENT'\]

**URL:** <https://www.ruby-forum.com/t/request-env-http-user-agent/188171>\
**Category:** Ruby\
**Created:** [May 6, 2010, 9:17pm UTC](https://www.ruby-forum.com/t/request-env-http-user-agent/188171 "2010-05-06T21:17:20Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mmcolli00](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/85e7bf/32.png) [@mmcolli00](https://www.ruby-forum.com/u/mmcolli00)\
**Post date:** [May 6, 2010, 9:17pm UTC](https://www.ruby-forum.com/t/request-env-http-user-agent/188171/1 "2010-05-06T21:17:20Z")

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Hi

I just want to do a simple output on my machine showing the ie browser.  
Every example of request.env[‘HTTP\_USER\_AGENT’] that I have seen shows  
no gem requirement. However, when I try to run this on my computer, I am  
getting the error below. Do you know what I am doing wrong here? Thanks  
MC

puts request.env[‘HTTP\_USER\_AGENT’].gsub(//| /, ‘’)

Error:  
browserVersion.rb:3: undefined local variable or method `request’ for  
main:Object (NameError)

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<div class="post-metadata">

**Author:** ![mmcolli00](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/85e7bf/32.png) [@mmcolli00](https://www.ruby-forum.com/u/mmcolli00)\
**Post date:** [May 6, 2010, 9:38pm UTC](https://www.ruby-forum.com/t/request-env-http-user-agent/188171/2 "2010-05-06T21:38:49Z")

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On Thu, May 6, 2010 at 9:17 PM, Mmcolli00 Mom [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> Error:  
> browserVersion.rb:3: undefined local variable or method `request’ for  
> main:Object (NameError)

The request object is usually something a web framework gives you. You  
don’t have a request for a regular ruby program.  
You should run that piece of code inside the scope of a request  
initiated by a browser to a URL served by your web server.

Jesus.