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I have a Java client that uses HttpClient to connect to a server and wait a response. The response may return after a long time (the client essentially waits for an event from the server).
Other than using timeouts, is there a way to detect when the server crashes?
Considering that a server which has “crashed” cannot be relied upon to send you a message indicating that it has crashed, no.
The solution is to use a timeout, to set an upper limit on the amount of time your client is willing to wait for a request.