Append add err to the collection c, if err is not nil.

GetKind returns the Kind of the passed error, or Unspecified if the error has no Kind or is not an acmeproxy error.

HasCause returns true if the error err has the error cause in its chain of wrapped errors.

IsKind checks if the error is of the expected Kind.

Log logs the passed error to logger.

LogFunc calles the passed function f.

Match returns true iff err matches the template error tmpl.

New creates a new Error.

Wrap returns nil if err is nil.

InvalidArgument shows that an opperation was called with one or more invalid arguments.

NotFound shows that an error was returned because something could not be found.

Unspecified is the default value for the an Error's Kind if nothing else was specified.

Error represents an error within acmeproxy.

Collection contains multiple errors that occurred during an operation.

Kind categorizes the nature of an error.

Op encapsulates the name of an operation.