Addressed review feedback
1. modified documentation
2. changed test slightly to make it more robust to accidental cache hits
diff --git a/test/cpp/interop/interop_server.cc b/test/cpp/interop/interop_server.cc
index ac2567e..64eec42 100644
--- a/test/cpp/interop/interop_server.cc
+++ b/test/cpp/interop/interop_server.cc
@@ -159,7 +159,7 @@
gpr_timespec ts = gpr_now(GPR_CLOCK_REALTIME);
std::string timestamp = std::to_string(ts.tv_nsec);
response->mutable_payload()->set_body(timestamp.c_str(), timestamp.size());
- context->AddInitialMetadata("Cache-Control", "max-age=100000, public");
+ context->AddInitialMetadata("cache-control", "max-age=100000, public");
return Status::OK;
}