prevent response splitting

[GoogleCodeExporter]

http://nealpoole.com/blog/2011/01/http-response-splitting-on-reddit-com/ goes 
to explain the issue

What steps will reproduce the problem?
1. aResponse headerAt: 'key' put: 'value', String crlf, 'Location: www.bad.com' 
String crlf, String crlf

What is the expected output? What do you see instead?
I'm not sure whether we should split the value or throw an exception. I'm 
leaning towards the later.

Original issue reported on code.google.com by philippe...@gmail.com on 16 Jan 2011 at 6:19