ServiceUnavailableError: Response timeout

[expressjs]

ServiceUnavailableError: Response timeout

[dougwilson]

Check the README... https://github.com/expressjs/timeout#express-3x and the multiple examples.

[mikeuduc]

Edit: having issues with my comment. Will update shortly...

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@Omar1123 The problem is that connect-timeout will call next(err) if you do not pass {respond: false} in the options. This will cause the express router to skip all of your middleware(s) and to your error handler. - https://expressjs.com/en/guide/error-handling.html

To me, the documentation seems outdated (express v3) or incorrect because haltOnTimedout will never get called unless you pass {respond: false}, yet the example uses the default { respond: true } with haltOnTimedout as middleware.

Putting it together, you can either pass { respond: false } and create your own error to pass to your error handler as follows:

function haltOnTimedout(req, res, next){
	if (!req.timedout){
		next();
	}
	else{
		let err = new Error("My custom timeout error");
		err.status = 504;
		next(err);
	}
}

function errorHandler( function(err, req, res, next) {
        //handle your timeout error here
        res.sendStatus(err.status)
});

router.post( '/upload', connectTimeout('1s', { respond: false } ), multipartMiddleware, haltOnTimedout, successHandler, errorHandler)

Or you can use default {respond: true} which will skip your haltOnTimedout middleware and process the error from connect-timeout

router.post( '/upload', connectTimeout('1s'), multipartMiddleware, successHandler, timedoutErrorHandler)