message Foo {
 string bar = 1;
}
message ListFoosResponse {
 repeated Foo foos = 1;
}
service FooService {
 rpc ListFoos(google.protobuf.Empty) returns (ListFoosResponse) {
 option (google.api.http) = {
 get: "/foo";
 response_body: "foos"; // This will not be handled when disable_default_responses=true
 };
 option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
 responses: {
 key: "200",
 value: {
 description: "List Foos"
 schema: {
 json_schema: {
 type: ARRAY;
 items: {ref: ".some.package.v1.Foo"};
 }
 }
 };
 };
 };
 };
};

 /foo:
 get:
 summary: List Foos.
 operationId: ListFoos
 responses:
 "200":
 description: List Foos
 schema:
 type: array
 items:
 $ref: '#/definitions/some.package.v1.Foo'