Add response to proto

Author: all-seeing-code

pydgraph/proto/api.proto

@@ -52,12 +52,21 @@ message Request {
 
 	repeated Mutation mutations = 12;
 	bool commit_now = 13;
+	enum RespFormat {
+		JSON = 0;
+		RDF = 1;
+	}
+	RespFormat resp_format = 14;
 }
 
 message Uids {
 	repeated string uids = 1;
 }
 
+message ListOfString {
+    repeated string value = 1;
+}
+
 message Response {
 	bytes json = 1;
 	TxnContext txn = 2;
@@ -67,6 +76,8 @@ message Response {
 	// uids contains a mapping of blank_node => uid for the node. It only returns uids
 	// that were created as part of a mutation.
 	map<string, string> uids = 12;
+	bytes rdf = 13;
+	map<string, ListOfString> hdrs = 14;
 }
 
 message Mutation {