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Re:Scala – 1 Star – Would Not Program Again by zaphar on Sunday December 01, 2013 @09:16PM (#6830951)
The author isn't wanting to write invalid headers. He's wanting to write perfectly valid headers that the framework he's using didn't allow him to write.

When the framework treats a a valid http header as invalid the framework is probably using the wrong abstraction for http headers.

Re:Scala – 1 Star – Would Not Program Again by ethzero on Sunday December 01, 2013 @09:36PM (#6831081)
Spray allows you to define custom (even invalid) headers, all you have to do is subclass HttpHeader. I'm sure the author knew this, but it's not obvious from his criticism.