diff --git a/nginx-1.17.8/src/http/modules/ngx_http_grpc_module.c b/nginx-1.17.8/src/http/modules/ngx_http_grpc_module.c
index d4af66db..10d3aaed 100644
--- a/nginx-1.17.8/src/http/modules/ngx_http_grpc_module.c
+++ b/nginx-1.17.8/src/http/modules/ngx_http_grpc_module.c
@@ -8,6 +8,9 @@
 #include <ngx_config.h>
 #include <ngx_core.h>
 #include <ngx_http.h>
+#if (NGX_HTTP_LUA_KONG)
+#include <ngx_http_lua_kong_module.h>
+#endif
 
 
 typedef struct {
@@ -566,6 +569,10 @@ ngx_http_grpc_handler(ngx_http_request_t *r)
         }
     }
 
+#if (NGX_HTTP_LUA_KONG)
+    ngx_http_lua_kong_set_grpc_authority(r, &ctx->host);
+#endif
+
     u->output.tag = (ngx_buf_tag_t) &ngx_http_grpc_module;
 
     u->conf = &glcf->upstream;