+5  A: 

If the entire cookie cannot be stored, the cookie won't be stored at all (at least, not in a compliant implementation). From RFC 2965, Section 5.3:

The information in a Set-Cookie2 response header MUST be retained in its entirety. If for some reason there is inadequate space to store the cookie, it MUST be discarded, not truncated.

T.J. Crowder  2010-10-01 09:50:49

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