1 files changed, 44 insertions, 0 deletions
diff --git a/test/cpp/interop/interop_client.cc b/test/cpp/interop/interop_client.cc
index ea5a1fd861..effbb8a42e 100644
--- a/test/cpp/interop/interop_client.cc
+++ b/test/cpp/interop/interop_client.cc
@@ -846,6 +846,50 @@ bool InteropClient::DoStatusWithMessage() {
   return true;
 }
 
+bool InteropClient::DoCacheableUnary() {
+  gpr_log(GPR_DEBUG, "Sending RPC with cacheable response");
+
+  // Create request with current timestamp
+  gpr_timespec ts = gpr_now(GPR_CLOCK_PRECISE);
+  std::string timestamp = std::to_string((long long unsigned)ts.tv_nsec);
+  SimpleRequest request;
+  request.mutable_payload()->set_body(timestamp.c_str(), timestamp.size());
+
+  // Request 1
+  ClientContext context1;
+  SimpleResponse response1;
+  context1.set_cacheable(true);
+  // Add fake user IP since some proxy's (GFE) won't cache requests from
+  // localhost.
+  context1.AddMetadata("x-user-ip", "1.2.3.4");
+  Status s1 =
+      serviceStub_.Get()->CacheableUnaryCall(&context1, request, &response1);
+  if (!AssertStatusOk(s1)) {
+    return false;
+  }
+  gpr_log(GPR_DEBUG, "response 1 payload: %s",
+          response1.payload().body().c_str());
+
+  // Request 2
+  ClientContext context2;
+  SimpleResponse response2;
+  context2.set_cacheable(true);
+  context2.AddMetadata("x-user-ip", "1.2.3.4");
+  Status s2 =
+      serviceStub_.Get()->CacheableUnaryCall(&context2, request, &response2);
+  if (!AssertStatusOk(s2)) {
+    return false;
+  }
+  gpr_log(GPR_DEBUG, "response 2 payload: %s",
+          response2.payload().body().c_str());
+
+  // Check that the body is same for both requests. It will be the same if the
+  // second response is a cached copy of the first response
+  GPR_ASSERT(response2.payload().body() == response1.payload().body());
+
+  return true;
+}
+
 bool InteropClient::DoCustomMetadata() {
   const grpc::string kEchoInitialMetadataKey("x-grpc-test-echo-initial");
   const grpc::string kInitialMetadataValue("test_initial_metadata_value");