https://github.com/senchalabs/connect/blob/master/lib/middleware/cookieParser.js#L49
https://github.com/shtylman/node-cookie/blob/master/index.js#L46

This line uses the parse function from the cookie module. When the cookie value cannot be decoded properly this function throws (since the decodeURIComponent function throws). My concern is that this appears as a system error (plain error object) which usually results in the server responding with a 5xx error response versus a bad request or possibly not parsing the given value.

Now, I could wrap the decode call in the cookie module and just set the value to the raw value versus the decoded one. I am thinking this would be the proper thing to do (as I don't think failing with unable to decode URI component is good behavior here) but I wanted to first get some feedback since it would technically be a change in behavior.

Issue senchalabs/connect#652 is related.

/ping @visionmedia