Unit application library.

Library now used in all language modules.
Old 'nxt_app_*' code removed.

See src/test/nxt_unit_app_test.c for usage sample.

src/nxt_unit_response.h

@@ -0,0 +1,27 @@
+
+/*
+ * Copyright (C) NGINX, Inc.
+ */
+
+#ifndef _NXT_UNIT_RESPONSE_H_INCLUDED_
+#define _NXT_UNIT_RESPONSE_H_INCLUDED_
+
+
+#include <inttypes.h>
+
+#include "nxt_unit_sptr.h"
+#include "nxt_unit_field.h"
+
+struct nxt_unit_response_s {
+    uint64_t              content_length;
+    uint32_t              fields_count;
+    uint32_t              piggyback_content_length;
+    uint16_t              status;
+
+    nxt_unit_sptr_t       piggyback_content;
+
+    nxt_unit_field_t      fields[];
+};
+
+
+#endif /* _NXT_UNIT_RESPONSE_H_INCLUDED_ */