addressed review feedback.

moved method computation in a if block only when send_initial_metadata
is true.

src/core/lib/channel/http_client_filter.c

@@ -208,14 +208,14 @@ static void hc_mutate_op(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
   call_data *calld = elem->call_data;
   channel_data *channeld = elem->channel_data;
 
+  if (op->send_initial_metadata != NULL) {
     /* Decide which HTTP VERB to use. We use GET if the request is marked
-  cacheable, and the operation contains both initial metadata and send message,
-  and the payload is below the size threshold, and all the data
+    cacheable, and the operation contains both initial metadata and send
+    message, and the payload is below the size threshold, and all the data
     for this request is immediately available. */
     grpc_mdelem *method = GRPC_MDELEM_METHOD_POST;
     calld->send_message_blocked = false;
-  if (op->send_initial_metadata != NULL &&
-      (op->send_initial_metadata_flags &
+    if ((op->send_initial_metadata_flags &
          GRPC_INITIAL_METADATA_CACHEABLE_REQUEST) &&
         op->send_message != NULL &&
         op->send_message->length < channeld->max_payload_size_for_get) {
@@ -225,6 +225,7 @@ static void hc_mutate_op(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
                GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST) {
       method = GRPC_MDELEM_METHOD_PUT;
     }
+
     /* Attempt to read the data from send_message and create a header field. */
     if (method == GRPC_MDELEM_METHOD_GET) {
       /* allocate memory to hold the entire payload */
@@ -258,7 +259,6 @@ static void hc_mutate_op(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
       }
     }
 
-  if (op->send_initial_metadata != NULL) {
     grpc_metadata_batch_filter(op->send_initial_metadata, client_strip_filter,
                                elem);
     /* Send : prefixed headers, which have to be before any application