springboot Whitelabel Error Page 找不到html页面

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浪费我这么久。主要我返回的页面是html，在pom.xml中添加thymeleaf依赖就好了

 @RequestMapping(value = "main",method = RequestMethod.GET)
    public String toMain(){
        return "main";
    }

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>