The string to be prepended to the key of each parameter to be retrieved; defaults to the empty string, looking keys up as they are given
A Vault retrieving parameters from the environment variables of the process
Error While retrieving a parameter, if no variable is defined under its key
Creates an environment vault.
Parameters are looked up among the environment variables of the process as each request is served, so that a variable defined after the vault was constructed is retrieved as well.
Keys may be prefixed, so that parameters are namespaced within a shared environment:
prefixis prepended as given, without a separator of its own.