Springboot中thymeleaf使用th:include时遇到的问题

Caused by: org.thymeleaf.exceptions.TemplateInputException: Error resolving template “header”, template might not exist or might not be accessible by any of the configured Template Resolvers (template: “/index.html” - line 46, col 10)
我的header.html与index.html是放在同一个目录下的。
错误根源：

    <div th:replace="header::header"></div>

解决：

    <div th:replace="/header::header"></div>