The method is to treat the protocol as structured data instead of a bunch of concatenated text. I.e. use a library that processes each piece of data, escaping a

The method is to treat the protocol as structured data instead of a bunch of concatenated text. I.e. use a library that processes each piece of data, escaping any invalid characters, before putting the pieces together. Strong typing isn't relevant here, this is applicable in any language. But the lib needs to know when you're putting text in a header name and when in the value.