Proxies the specified {@code original} FilterChain with the named chain. The returned{@code FilterChain} instance will first execute the configured named chain and then lastly invoke the given{@code original} chain.
@param original the original FilterChain to proxy
@param chainName the name of the internal configured filter chain that should 'sit in front' of the specifiedoriginal chain.
@return a {@code FilterChain} instance that will execute the named chain and then finally thespecified {@code original} FilterChain instance.
@throws IllegalArgumentException if there is no configured chain with the given {@code chainName}.
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