Swallow content-type at the client. Fixes #3368

src/core/surface/call.c

@@ -1485,6 +1485,8 @@ static void recv_metadata(grpc_call *call, grpc_metadata_batch *md) {
     } else if (key == grpc_channel_get_encodings_accepted_by_peer_string(
                           call->channel)) {
       set_encodings_accepted_by_peer(call, md->value->slice);
+    } else if (key == grpc_channel_get_content_type_string(call->channel)) {
+      continue; /* swallow "content-type" header */
     } else {
       dest = &call->buffered_metadata[is_trailing];
       if (dest->count == dest->capacity) {

src/core/surface/channel.c

@@ -69,6 +69,7 @@ struct grpc_channel {
   grpc_mdstr *grpc_compression_algorithm_string;
   grpc_mdstr *grpc_encodings_accepted_by_peer_string;
   grpc_mdstr *grpc_message_string;
+  grpc_mdstr *content_type_string;
   grpc_mdstr *path_string;
   grpc_mdstr *authority_string;
   grpc_mdelem *default_authority;
@@ -111,6 +112,8 @@ grpc_channel *grpc_channel_create_from_filters(
       grpc_mdstr_from_string(mdctx, "grpc-accept-encoding", 0);
   channel->grpc_message_string =
       grpc_mdstr_from_string(mdctx, "grpc-message", 0);
+  channel->content_type_string =
+      grpc_mdstr_from_string(mdctx, "content-type", 0);
   for (i = 0; i < NUM_CACHED_STATUS_ELEMS; i++) {
     char buf[GPR_LTOA_MIN_BUFSIZE];
     gpr_ltoa((long)i, buf);
@@ -281,6 +284,7 @@ static void destroy_channel(void *p, int ok) {
   GRPC_MDSTR_UNREF(channel->grpc_compression_algorithm_string);
   GRPC_MDSTR_UNREF(channel->grpc_encodings_accepted_by_peer_string);
   GRPC_MDSTR_UNREF(channel->grpc_message_string);
+  GRPC_MDSTR_UNREF(channel->content_type_string);
   GRPC_MDSTR_UNREF(channel->path_string);
   GRPC_MDSTR_UNREF(channel->authority_string);
   while (channel->registered_calls) {
@@ -364,6 +368,10 @@ grpc_mdstr *grpc_channel_get_message_string(grpc_channel *channel) {
   return channel->grpc_message_string;
 }
 
+grpc_mdstr *grpc_channel_get_content_type_string(grpc_channel *channel) {
+  return channel->content_type_string;
+}
+
 gpr_uint32 grpc_channel_get_max_message_length(grpc_channel *channel) {
   return channel->max_message_length;
 }

src/core/surface/channel.h

@@ -59,6 +59,7 @@ grpc_mdstr *grpc_channel_get_compression_algorithm_string(
 grpc_mdstr *grpc_channel_get_encodings_accepted_by_peer_string(
     grpc_channel *channel);
 grpc_mdstr *grpc_channel_get_message_string(grpc_channel *channel);
+grpc_mdstr *grpc_channel_get_content_type_string(grpc_channel *channel);
 gpr_uint32 grpc_channel_get_max_message_length(grpc_channel *channel);
 
 #ifdef GRPC_CHANNEL_REF_COUNT_DEBUG