Thymeleaf本頁面通過controller跳轉到本頁面的坑

當你嘗試用spring boot+thymeleaf，來實現本頁面跳轉到本頁面功能時，我們以index通過controller跳轉到index爲例，你會發現，return"index"，會報如下錯，太坑了解決辦法，我用的是重定向"redirect:/index"

 [THYMELEAF][http-nio-8080-exec-10] Exception processing template "index": An error happened during template parsing (template: "class path resource [templates/index.html]")

org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/index.html]")
	at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parse(AbstractMarkupTemplateParser.java:241) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
	at org.thymeleaf.templateparser.markup.AbstractMarkupTemplateParser.parseStandalone(AbstractMarkupTemplateParser.java:100) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
	at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:666) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]
	```