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In some cases we don't want to known if a fetch or converter fails. We just want a valid string. After this patch, we have two sets of fetches and two sets of converters. There are: txn.f, txn.sf, txn.c, txn.sc. The version prefixed by 's' always returns strings for any type, and returns an empty string in the error case or when the data are not available. This is particularly useful when manipulating headers or cookies.