Prefer grpc status over http status

test

src/core/ext/transport/chttp2/transport/parsing.cc

@@ -393,6 +393,7 @@ error_handler:
 static void free_timeout(void* p) { gpr_free(p); }
 
 static void on_initial_header(void* tp, grpc_mdelem md) {
+  gpr_log(GPR_INFO, "on initial header");
   GPR_TIMER_SCOPE("on_initial_header", 0);
 
   grpc_chttp2_transport* t = static_cast<grpc_chttp2_transport*>(tp);
@@ -475,6 +476,7 @@ static void on_initial_header(void* tp, grpc_mdelem md) {
 }
 
 static void on_trailing_header(void* tp, grpc_mdelem md) {
+  gpr_log(GPR_INFO, "on_trailing_header");
   GPR_TIMER_SCOPE("on_trailing_header", 0);
 
   grpc_chttp2_transport* t = static_cast<grpc_chttp2_transport*>(tp);

src/core/lib/surface/call.cc

@@ -685,10 +685,10 @@ static void cancel_with_status(grpc_call* c, grpc_status_code status,
 }
 
 static void set_final_status(grpc_call* call, grpc_error* error) {
-  if (grpc_call_error_trace.enabled()) {
+  //if (grpc_call_error_trace.enabled()) {
     gpr_log(GPR_DEBUG, "set_final_status %s", call->is_client ? "CLI" : "SVR");
     gpr_log(GPR_DEBUG, "%s", grpc_error_string(error));
-  }
+  //}
   if (call->is_client) {
     grpc_error_get_status(error, call->send_deadline,
                           call->final_op.client.status,

test/core/end2end/tests/filter_status_code.cc

@@ -249,6 +249,24 @@ typedef struct final_status_data {
   grpc_call_stack* call;
 } final_status_data;
 
+static void start_transport_stream_op_batch(grpc_call_element *elem,
+                                      grpc_transport_stream_op_batch *op) {
+  auto* data = static_cast<final_status_data*>(elem->call_data);
+  if(data->call == g_server_call_stack) {
+    gpr_log(GPR_INFO, "here");
+  }
+  if(op->send_initial_metadata) {
+    auto *batch = op->payload->send_initial_metadata.send_initial_metadata;
+    gpr_log(GPR_INFO, "init %p %p", batch->idx.named.status, batch->idx.named.grpc_status);
+    grpc_metadata_batch_substitute(batch, batch->idx.named.status, GRPC_MDELEM_STATUS_404);
+  }
+  if(op->send_trailing_metadata) {
+    auto *batch = op->payload->send_trailing_metadata.send_trailing_metadata;
+    gpr_log(GPR_INFO, "trai %p %p", batch->idx.named.status, batch->idx.named.grpc_status);
+  }
+  grpc_call_next_op(elem, op);
+}
+
 static grpc_error* init_call_elem(grpc_call_element* elem,
                                   const grpc_call_element_args* args) {
   final_status_data* data = static_cast<final_status_data*>(elem->call_data);
@@ -307,7 +325,7 @@ static const grpc_channel_filter test_client_filter = {
     "client_filter_status_code"};
 
 static const grpc_channel_filter test_server_filter = {
-    grpc_call_next_op,
+    start_transport_stream_op_batch,
     grpc_channel_next_op,
     sizeof(final_status_data),
     init_call_elem,