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    <p>I'm not sure where it's gone, but an answer popped in here and disappeared with a link to <a href="https://github.com/andyet/paddle" rel="nofollow">https://github.com/andyet/paddle</a> - a small library designed to provide callback execution "insurance". At least it suggests I'm not the first person to have scratched my head regarding this problem.</p> <p>From the docs on there is an anecdote validating the question somewhat:</p> <blockquote> <p>Node.js famously had an http client but where occasionally no callback would occur for an HTTP request if the response was too fast. If I wanted to make sure my http client callback occurred.</p> </blockquote> <p>The example they give is a little more sophisticated than my example and can handle event based callbacks, enabling code to regularly "check in" as intermediate activity like an ondata handler fires and then trigger an error if it stops or times out.</p> <pre><code>setTimeout(function() { paddle.stop(); }, 12000); var req = http.get(options, function(res) { var http_insurance = paddle.insure(function(res) { console.log("The request never had body events!"); console.log('STATUS: ' + res.statusCode); console.log('HEADERS: ' + JSON.stringify(res.headers)); }, 9, [res]); res.setEncoding('utf8'); res.on('data', function (chunk) { console.log('BODY: ' + chunk); http_insurance.check_in(); }); }); req.end(); </code></pre> <p>I'm answering my own question here, but I would still be interested to see if any other implementations, libraries or patterns exist to solve the same problem.</p>
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    1. POIn node.js programming, how do you handle the scenario where a callback doesn't fire?
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    1. COI've never heard about such thing as callback not firing, because response was too fast. :D This would imply serious bug in Node.js engine. And if that's the case, then I don't know how you can be sure that `setTimeout` callback will fire? You don't understand, it is impossible to ensure that and worrying about it is just a waste of time. And yes: it looks like you have a lack of faith in Node.js engine. Feel free to use other engines. Although I'm sure you won't be creating seperate thread per request just to make sure that the response have been received. :)
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    2. COAnyway, if it makes you feel better, then feel free to accept your own answer.
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    3. CO@freakish - I don't know why you're having such a hard time accepting that a callback not firing is a problem that could exist. Nowhere have I stated that it has to be core node engine code that does this, it could be a branch missed in your code that fails to callback correctly or something similar in a library you use. Spotting which callback fails to fire and logging it is the first step to finding the fault and fixing it, whether in your own code or upstream.
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