Hello, I believe the following behaviour is a bug: (drakma::parse-set-cookie "session=\"1,2,3\"; domain=example.com; path=/") generates an error: While parsing cookie header "session=\"1,2,3\"; domain=example.com; path=/": Read character #\,, but expected #\=. [Condition of type SIMPLE-ERROR] Restarts: 0: [ABORT] Return to SLIME's top level. 1: [TERMINATE-THREAD] Terminate this thread (#<THREAD "new-repl-thread" {1004560551}>) Backtrace: 0: (CHUNGA::SIGNAL-UNEXPECTED-CHARS #\, #\=) 1: (CHUNGA:ASSERT-CHAR #<SB-IMPL::STRING-INPUT-STREAM {1004562A51}> #\=) 2: (CHUNGA:READ-NAME-VALUE-PAIR #<SB-IMPL::STRING-INPUT-STREAM {1004562A51}>)[:EXTERNAL] 3: (DRAKMA::PARSE-SET-COOKIE "session=\"1,2,3\"; domain=example.com; path=/") According to RFC2965[1], av-pairs = av-pair *(";" av-pair) av-pair = attr ["=" value] ; optional value attr = token value = token | quoted-string value is either a token or a quoted string. According to RFC2616[2], quoted-string = ( <"> *(qdtext | quoted-pair ) <"> ) qdtext = <any TEXT except <">> quoted string can contain any text except \", including commas. I know a particular web-site (reddit.com) that sets cookies of that form, and Firefox parses them without any problem. The problem seem to be in read-name-value-pair from CHUNGA: DRAKMA> (with-input-from-string (in "session=\"1,2,3\"; domain=example.com; path=/") (read-name-value-pair in :cookie-syntax t)) ("session" . "\"1") Best Regards, Victor. [1] http://www.faqs.org/rfcs/rfc2965.html [2] http://www.faqs.org/rfcs/rfc2616.html -- http://macrodefinition.blogspot.com