Ruby string concat with webrick -


I have this code that I want to modify (new in Ruby) 

  HRand = rand (10) .to_s if (request.path == '/ test') response.status = 200 response ['content-type'] = 'text / html' response.body = File.read ('C: \ # # {HRand} .html ')   
 When I use Localhost: 8080 / test me  
 
 "No such file or directory C: \ # {hRand} .html "  
 Why is not being changed? This is because string projection only works with double quoted strings:  
 pre>  file. ("C: \ # # hRand} .html")

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