diff --git a/protoburp.py b/protoburp.py
index fb19cc1..8ff98c2 100755
--- a/protoburp.py
+++ b/protoburp.py
@@ -36,7 +36,7 @@
 from ui import ParameterProcessingRulesTable
 
 
-CONTENT_PROTOBUF = ['application/x-protobuf', 'application/x-protobuffer', 'application/x-protobuffer; charset=utf-8', 'application/octet-stream', 'application/grpc-web+proto']
+CONTENT_PROTOBUF = ['application/x-protobuf', 'application/x-protobuffer', 'application/x-protobuffer; charset=utf-8', 'application/octet-stream', 'application/grpc-web+proto', 'application/grpc-web-text']
 
 PROTO_FILENAME_EXTENSION_FILTER = FileNameExtensionFilter("*.proto, *.py",
                                                           ["proto", "py"])