anchor.diff:  ** Added support for https://github.com/spring-projects/spring-security/issues/7711[AuthNRequest signatures]
   ** Added support for https://github.com/spring-projects/spring-security/pull/7759[AuthNRequest POST binding]
   
  +[[whats-new-webflux]]
   === WebFlux
   
   * Added https://github.com/spring-projects/spring-security/issues/7636[DSL support for custom header writers]
  
positive.code: Spring Security 5.3 provides a number of new features.
  Below are the highlights of the release.
  
  === Documentation Updates
  
  We will continue our effort to rewrite the documentation.
  
negative.code: ** Added <<servlet-authentication-userdetailsservice,toggle>>
  ** Updated styles
  
  [[whats-new-servlet]]
  === Servlet
  
  * Added <<kotlin-config-httpsecurity,Kotlin DSL>>
  