ngx_log_debug4    128 core/ngx_log.h #define ngx_log_debug4  ngx_log_debug
ngx_log_debug4    153 core/ngx_log.h #define ngx_log_debug4(level, log, err, fmt, arg1, arg2, arg3, arg4)          \
ngx_log_debug4    186 core/ngx_log.h #define ngx_log_debug4(level, log, err, fmt, arg1, arg2, arg3, arg4)