Spring Security 3.x: How can I enable both BASIC and DIGEST authentication?

I want to configure Spring Security to enable both BASIC and DIGEST authentication for the same set of URL's, but it's unclear whether or not this is possible. I see that I need to enable multiple AuthenticationEntryPoint instances to set the appropriate HTTP headers, but I don't see any built in classes to accomodate this. DelegatingAuthenticationEntryPoint comes close, but ultimately it only selects one entry point.

I 开发者_StackOverflowimplemented a custom AuthenticationEntryPoint that calls the commence method on a supplied list of AuthenticationEntryPoint instances, but it eventually throws an IllegalStateException because each AuthenticationEntryPoint calls sendError (which I gather is not allowed).

Is there any way to do this without implementing a completely custom entry point?

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Id did it by configuring Spring security for Digest authentication only, and then adding a BasicProcessingFilter manually at the beginning of the filter chain, as explained There

<bean id="basicProcessingFilter" class="org.springframework.security.ui.basicauth.BasicProcessingFilter">
<property name="authenticationManager"><ref bean="authenticationManager"/></property>
 <security:custom-filter before="AUTHENTICATION_PROCESSING_FILTER"/>
<property name="authenticationEntryPoint"><ref bean="authenticationEntryPoint"/></property>