diff --git a/cmd/protoc-gen-go/internal_gengo/main.go b/cmd/protoc-gen-go/internal_gengo/main.go
index e29f52beb..90e381291 100644
--- a/cmd/protoc-gen-go/internal_gengo/main.go
+++ b/cmd/protoc-gen-go/internal_gengo/main.go
@@ -756,9 +756,22 @@ func fieldDefaultValue(g *protogen.GeneratedFile, f *fileInfo, m *messageInfo, f
 }
 
 func fieldJSONTagValue(field *protogen.Field) string {
+	if field.Desc.JSONName() == "-" {
+		return "-"
+	} else if field.Desc.JSONName() == "MUST" {
+		return string(field.Desc.Name())
+	}
 	return string(field.Desc.Name()) + ",omitempty"
 }
 
+func fieldFORMTagValue(field *protogen.Field) string {
+	return string(field.Desc.Name())
+}
+
+func fieldURITagValue(field *protogen.Field) string {
+	return string(field.Desc.Name())
+}
+
 func genExtensions(g *protogen.GeneratedFile, f *fileInfo) {
 	if len(f.allExtensions) == 0 {
 		return
diff --git a/cmd/protoc-gen-go/internal_gengo/opaque.go b/cmd/protoc-gen-go/internal_gengo/opaque.go
index 45749edd1..4b3c44d59 100644
--- a/cmd/protoc-gen-go/internal_gengo/opaque.go
+++ b/cmd/protoc-gen-go/internal_gengo/opaque.go
@@ -85,6 +85,8 @@ func opaqueGenMessageField(g *protogen.GeneratedFile, f *fileInfo, message *mess
 	}
 	protobufTagValue := fieldProtobufTagValue(field)
 	jsonTagValue := fieldJSONTagValue(field)
+	formTagValue := fieldFORMTagValue(field)
+	uriTagValue := fieldURITagValue(field)
 	if g.InternalStripForEditionsDiff() {
 		if field.Desc.ContainingOneof() != nil && field.Desc.ContainingOneof().IsSynthetic() {
 			protobufTagValue = strings.ReplaceAll(protobufTagValue, ",oneof", "")
@@ -95,7 +97,10 @@ func opaqueGenMessageField(g *protogen.GeneratedFile, f *fileInfo, message *mess
 		{"protobuf", protobufTagValue},
 	}
 	if !message.isOpaque() {
-		tags = append(tags, structTags{{"json", jsonTagValue}}...)
+		tags = append(tags, structTags{
+			{"json", jsonTagValue},
+			{"form", formTagValue},
+			{"uri", uriTagValue}}...)
 	}
 	if field.Desc.IsMap() {
 		keyTagValue := fieldProtobufTagValue(field.Message.Fields[0])