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Editorial Team
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Asked: 2026-05-14T15:52:12+00:00

I have an Rails application with SayController , hello action and view template say/hello.html.erb

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I have an Rails application with SayController, hello action and view template say/hello.html.erb. When I add some cyrillic character like “ю”, I get an error:

ArgumentError in SayController#hello

invalid byte sequence in UTF-8

Headers: 

{"Cache-Control"=>"no-cache",
 "X-Runtime"=>"11",
 "Content-Type"=>"text/html; charset=utf-8"}

If I try to write this letter with embedded Ruby, 

<%= "ю" %>

I don’t get any error, but it displays a question mark in black square (�) instead of this letter.

I use Windows 7 x64, Ruby 1.9.1p378, Rails 2.3.5, WEBrick server.

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1 Answer

  1. Editorial Team

    A likely cause of this error is that the file which contains the cyrillic letters is not encoded in UTF8, but perhaps in some russian encoding like KOI8. This will cause the characters to be impossible to interpret in UTF8 (and rightly so!).

    So double check that your file is properly encoded in UTF8.

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