GRPC_ARG_WORKAROUND_CRONET_COMPRESSION

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C)
static if(!is(typeof(GRPC_ARG_WORKAROUND_CRONET_COMPRESSION)))
enum GRPC_ARG_WORKAROUND_CRONET_COMPRESSION = "grpc.workaround.cronet_compression";

Meta