@type t() :: %Envoy.Config.Common.MutationRules.V3.HeaderMutationRules{
__unknown_fields__: [
{field_number :: integer(), Protobuf.Wire.Types.wire_type(),
value :: term()}
],
allow_all_routing: Google.Protobuf.BoolValue.t() | nil,
allow_envoy: Google.Protobuf.BoolValue.t() | nil,
allow_expression: Envoy.Type.Matcher.V3.RegexMatcher.t() | nil,
disallow_all: Google.Protobuf.BoolValue.t() | nil,
disallow_expression: Envoy.Type.Matcher.V3.RegexMatcher.t() | nil,
disallow_is_error: Google.Protobuf.BoolValue.t() | nil,
disallow_system: Google.Protobuf.BoolValue.t() | nil
}