protobuff

message Request {
	required Header header = 1; // Header message
	required bytes data = 2; // Serialized message
}

message Header{
	required string type = 3; // Message type. Equals message name (case-sensitive).
}

message Text {
	required string text= 1;
}


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message Request {
	required Header header = "Header message (dole)"; // Header message
	required bytes data = "Text message (dole); // Serialized message
}

message Header{
	required string type = "Text"; // Message type. Equals message name (case-sensitive).
}

message Text {
	required string text= "abc";
}