Unicode Cookie Value

Question

I am about to start to make a cookie with Unicode value (Japanese characters) is there any problem with Unicode Cookie value? in IE 7 IE 8 Firefox, Safari, Chrome?

Thank you

Answer 1

you can't transfer Unicode like that in headers, you might need to encode it into base64 or quoted-printable

Answer 2

Technically speaking, the content of the cookie value is opaque and can be anything the server wants, even binary data, as long as the resulting HTTP headers follow the rules of the HTTP specifications. By convention, most servers encode non-ASCII data, typically with URL-encoding (a non-ASCII byte is represented as "%XX", where XX is the hex value of the byte).