SpringBoot 2.2.X not supported by default put, delete, etc. the requested method.
First need to open them in the configuration file, the code is as follows:
spring.mvc.hiddenmethod.filter.enabled=true
And then form the label inside the statement method to post
Finally, use the following tags in the form inside
<input th:type="hidden" name="_method" value="put">
name must be "_method", value is the value that you want to use the request method, put or delete, etc.