i suppose it would depend on the protocol you expect to be using. for instance, if its standard HTTP protocol, you could send a HEAD request to see if its alive (being sure to set a timeout first), or if its FTP protocol, you could send a NOOP request. you could then factor that check into a subroutine, and call it before each
actual request you make.
Of course, if you're using a standard protocol, you can probably find an existing module to handle the low-level stuff for you and avoid sockets altogether (one of the many LWP modules for instance).
__________
Systems development is like banging your head against a wall...
It's usually very painful, but if you're persistent, you'll get through it.
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