Pipe after successful condition Node js [duplicate]

问题

This question already has answers here:

How to modify pipe to return custom response? (2 answers)

Closed last year.

request.get(fileLink)
    .on('response', function(response) {
        if (response.statusCode == 200 && response.headers['content-type'] == 'application/vnd.ms-excel') {
           return true;
        } else {
         return false;
        }
    })
    .pipe(fs.createWriteStream('data.xls'));

I need to save file if response code is 200 and content-type is application/vnd.ms-excel. How to organize code?

回答1:

The way to do it, is to pipe response if the condition is met, and destroy the response stream otherwise.

request.get(fileLink)
    .on('response', function(response) {
        if (response.statusCode == 200 && response.headers['content-type'] == 'application/vnd.ms-excel') {
            return response
                .pipe(fs.createWriteStream('data.xls'))
                .on('error', console.error)
        }

        response.destroy();
    });

来源：https://stackoverflow.com/questions/51407928/pipe-after-successful-condition-node-js