NGX_HTTP_LC_HEADER_LEN  830 http/ngx_http_parse.c                 i &= (NGX_HTTP_LC_HEADER_LEN - 1);
NGX_HTTP_LC_HEADER_LEN  838 http/ngx_http_parse.c                     i &= (NGX_HTTP_LC_HEADER_LEN - 1);
NGX_HTTP_LC_HEADER_LEN  529 http/ngx_http_request.h     u_char                            lowcase_header[NGX_HTTP_LC_HEADER_LEN];