Make go's cookie jar more url encoding tolerant.

cooookie.patch

--- /usr/local/go/src/net/http/cookiejar/jar.go	2018-05-11 10:28:23.000000000 +1000
+++ cooookie/jar.go	2018-05-11 11:27:43.000000000 +1000
@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.

 // Package cookiejar implements an in-memory RFC 6265-compliant http.CookieJar.
-package cookiejar
+package cooookie

 import (
 	"errors"
@@ -369,6 +369,10 @@
 	if i == 0 {
 		return "/" // Path has the form "/abc".
 	}
+
+	if s, err := url.PathUnescape(path[:i]); err == nil {
+		return s
+	}
 	return path[:i] // Path is either of form "/abc/xyz" or "/abc/xyz/".
 }

@@ -386,6 +390,8 @@

 	if c.Path == "" || c.Path[0] != '/' {
 		e.Path = defPath
+	} else if path, err := url.PathUnescape(c.Path); err == nil {
+		e.Path = path
 	} else {
 		e.Path = c.Path
 	}