ErrorJSONMsg returns a json-encoded error message.

ErrorJSONMsgf returns a json-encoded error message using the printf formatter.

NewStringMemoizer creates a new uninitialized StringMemoizer.

RedactURL is equivalent to parsing a URL string and then calling Redacted() to replace passwords, if any, with xxxxx.

StringMemoizer is a simple encapsulation of a lazily evaluated-only-once string function.

CleanupTasks accumulates a list of things which should be done at the end of a method unless Clear() is called.