discrease slightly ngx_http_parse_header_line() size:
this line is not required for LF, however, this case is very seldom
diff --git a/src/http/ngx_http_parse.c b/src/http/ngx_http_parse.c
index c1fba52..9865564 100644
--- a/src/http/ngx_http_parse.c
+++ b/src/http/ngx_http_parse.c
@@ -739,11 +739,11 @@
 
         /* first char */
         case sw_start:
+            r->header_name_start = p;
             r->invalid_header = 0;
 
             switch (ch) {
             case CR:
-                r->header_name_start = p;
                 r->header_end = p;
                 state = sw_header_almost_done;
                 break;
@@ -752,7 +752,6 @@
                 goto header_done;
             default:
                 state = sw_name;
-                r->header_name_start = p;
 
                 c = lowcase[ch];