The parse_cookies function in request.R attempts to split cookies on each occurrence of =; this appears to generate errors such as the following when multiple instances of = occur within a cookie:

ERROR: 'names' attribute [11] must be the same length as the vector [10]

This may be reproduced by using curl or a similar tool to pass a cookie string containing two or more =, e.g.

curl -v -H "Cookie: a=1=2" 127.0.0.1:8050

The original lines are here:

This pull request proposes to modify line 440:

cookies <- unlist(strsplit(sub("=", ";", cookies), ";"))

Since sub will only replace the first matching =, strsplit will split the line only once.