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POHow to pipe one readable stream into two writable streams at once in Node.js?
 

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  1. POHow to pipe one readable stream into two writable streams at once in Node.js?
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    <p>The goal is to:</p> <ol> <li>Create a file read stream.</li> <li>Pipe it to gzip (<code>zlib.createGzip()</code>)</li> <li><p>Then pipe the read stream of zlib output to:</p> <p>1) HTTP <code>response</code> object</p> <p>2) <strong>and</strong> writable file stream to save the gzipped output.</p></li> </ol> <p>Now I can do down to 3.1:</p> <pre><code>var gzip = zlib.createGzip(), sourceFileStream = fs.createReadStream(sourceFilePath), targetFileStream = fs.createWriteStream(targetFilePath); response.setHeader('Content-Encoding', 'gzip'); sourceFileStream.pipe(gzip).pipe(response); </code></pre> <p>... which works fine, but I need to also <strong>save the gzipped data to a file</strong> so that I don't need to regzip every time and be able to directly stream the gzipped data as a response.</p> <p><strong>So how do I pipe one readable stream into two writable streams at once in Node?</strong></p> <p>Would <code>sourceFileStream.pipe(gzip).pipe(response).pipe(targetFileStream);</code> work in Node 0.8.x?</p>
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