copy protocol value when large request line is copied,
this fixes error "fastcgi: the request record is too big"

src/http/ngx_http_request.c

diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index 5ecdf12..3d06f96 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -1154,6 +1154,10 @@
             r->args_start = new + (r->args_start - old);
         }
 
+        if (r->http_protocol.data) {
+            r->http_protocol.data = new + (r->http_protocol.data - old);
+        }
+
     } else {
         r->header_name_start = new;
         r->header_name_end = new + (r->header_name_end - old);