Determine TLS Handshake Failed vs Server Unavailable

[#1]

I have configured my proxy with 2-way SSL. When TLS hand shake failed, I get error Service temporarily unavailable by default and its default fault.name is "ServiceUnavailable". My usecase would like to change the default error message when TLS Handshake is failed. Because, "ServiceUnavailable" is generic even it is applicable when Server goes down and etc. Is there anyway i can determine the TLS handshake failed and customize the error message. When i see the system log, it shows Hand Shake failed message. But, i need to get something like that in Edge UI as well in order to determine the TLS Handshake failed.

com.apigee.messaging.adaptors.http.flow.data.LBTargetRequestSender$ResponseListenerForLBTarget$1.onException(LBTargetRequestSender.java:469)
[http-adaptor-1.0.0.jar:na]
        at
com.apigee.protocol.http.HTTPClient$Context.handshakeFailed(HTTPClient.java:1286)
[http-1.0.0.jar:na]
        at
com.apigee.nio.SSLTransport.run(SSLTransport.java:156) [nio-1.0.0.jar:na]
        at
com.apigee.nio.SSLTransport.process(SSLTransport.java:488) [nio-1.0.0.jar:na]
        at
com.apigee.nio.ClientChannel.process(ClientChannel.java:263) [nio-1.0.0.jar:na]
        at
com.apigee.nio.NIOSelector$SelectedIterator.findNext(NIOSelector.java:479)
[nio-1.0.0.jar:na]
        at
com.apigee.nio.NIOSelector$SelectedIterator.findNext(NIOSelector.java:449)
[nio-1.0.0.jar:na]
        at
com.apigee.nio.util.NonNullIterator.computeNext(NonNullIterator.java:16)
[nio-1.0.0.jar:na]
        at
com.apigee.nio.util.AbstractIterator.hasNext(AbstractIterator.java:36)
[nio-1.0.0.jar:na]
        at
com.apigee.nio.NIOSelector$2.findNext(NIOSelector.java:266) [nio-1.0.0.jar:na]
        at
com.apigee.nio.NIOSelector$2.findNext(NIOSelector.java:256) [nio-1.0.0.jar:na]
        at com.apigee.nio.util.NonNullIterator.computeNext(NonNullIterator.java:16)
[nio-1.0.0.jar:na]
        at
com.apigee.nio.util.AbstractIterator.hasNext(AbstractIterator.java:36)
[nio-1.0.0.jar:na]
        at
com.apigee.nio.handlers.NIOThread.run(NIOThread.java:59) [nio-1.0.0.jar:na]