module HTTP::Cookie::URIParser

def escape_path(path)

More specifically, gen-delims minus "/" / "?" / "#"
Escape RFC 3986 "reserved" characters minus valid characters for path 
def escape_path(path)
  path.sub(/\A[^?#]+/) { |p| p.gsub(/[:\[\]@]+/) { |r| CGI.escape(r) } }
end

def parse(uri)

Parse a URI string or object, relaxing the constraints on the path component 
def parse(uri)
  URI(uri)
rescue URI::InvalidURIError
  str = String.try_convert(uri) or
    raise ArgumentError, "bad argument (expected URI object or URI string)"
  m = URIREGEX.match(str) or raise
  path = m[:path]
  str[m.begin(:path)...m.end(:path)] = escape_path(path)
  uri = URI.parse(str)
  uri.__send__(:set_path, path)
  uri
end