--- a/src/http/v3/ngx_http_v3_module.c
+++ b/src/http/v3/ngx_http_v3_module.c
@@ -102,6 +102,8 @@ static ngx_command_t  ngx_http_v3_comman
 
 static ngx_int_t ngx_http_variable_quic(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
+static ngx_int_t ngx_http_variable_http3(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
 static ngx_int_t ngx_http_v3_add_variables(ngx_conf_t *cf);
 static void *ngx_http_v3_create_srv_conf(ngx_conf_t *cf);
 static char *ngx_http_v3_merge_srv_conf(ngx_conf_t *cf,
@@ -143,6 +145,9 @@ static ngx_http_variable_t  ngx_http_v3_
     { ngx_string("quic"), NULL, ngx_http_variable_quic,
       0, 0, 0 },
 
+    { ngx_string("http3"), NULL, ngx_http_variable_http3,
+      0, 0, 0 },
+
       ngx_http_null_variable
 };
 
@@ -168,6 +173,25 @@ ngx_http_variable_quic(ngx_http_request_
 
 
 static ngx_int_t
+ngx_http_variable_http3(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    v->valid = 1;
+    v->no_cacheable = 1;
+    v->not_found = 0;
+
+    v->data = ngx_pnalloc(r->pool, sizeof("h3-xx") - 1);
+    if (v->data == NULL) {
+        return NGX_ERROR;
+    }
+
+    v->len = ngx_sprintf(v->data, "h3-%d", NGX_QUIC_DRAFT_VERSION) - v->data;
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
 ngx_http_v3_add_variables(ngx_conf_t *cf)
 {
     ngx_http_variable_t  *var, *v;