Bug fix. Called c_str on a temp string
diff --git a/src/cpp/client/channel.cc b/src/cpp/client/channel.cc
index 9695a0f..17f31c2 100644
--- a/src/cpp/client/channel.cc
+++ b/src/cpp/client/channel.cc
@@ -71,7 +71,7 @@
   } else {
     const char* host_str = NULL;
     if (!context->authority().empty()) {
-      host_str = context->authority().c_str();
+      host_str = context->authority_.c_str();
     } else if (!host_.empty()) {
       host_str = host_.c_str();
     }