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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Multi Threaded Downloader</title>
<link rel="stylesheet" href="./examples/style.css">
</head>
<body>
<a class="github-corner" target="_blank" href="https://github.com/Backblaze-B2-Samples/multithreaded-downloader-js">
<svg width="100" height="100" viewbox="0 0 250 250" style="fill:#151513; color:#fff; position: absolute; top: 0; border: 0; right: 0;">
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<text class="github-corner-text" text-anchor="middle" x="175" y="25" transform="rotate(45)" font-size="30" font-weight="bold">Fork me on Github</text>
</svg>
</a>
<main>
<h2>Multi Threaded Downloader</h2>
<p>A browser based multi-threaded downloader implemented in vanilla JavaScript.</p>
<p>Fetches parts of a file using the HTTP Range header and downloads those pieces in parallel. When the pieces have all been downloaded, the original file is re-assembled and saved in the browser's Downloads folder.</p>
<ul>
<li>Sends HTTP HEAD request to get the file info</li>
<li>Calculate number of ranges and setup</li>
<li>Sends HTTP GET requests with "Range: bytes=start-end" header for each chunk</li>
<li>Monitor the progress of each response stream</li>
<li>Retry on fail or specific HTTP status codes (like 503 Service Unavailable)</li>
<li>Concatenates each response stream (in order) into a final output stream</li>
<li>Uses [StreamSaver.js](https://github.com/jimmywarting/StreamSaver.js) to simplify downloading the output stream.</li>
<li>100% client side JavaScript, no plug-ins or proxy required</li>
</ul>
This project is under development and still has some bugs.
<br/>
<h3>Demos</h3>
<ul>
<li>
<a href="examples/backblaze.html">Backblaze B2</a>
</li>
<li>
<a href="examples/googleDrive.html">Google Drive</a>
</li>
</ul>
<br/>
</main>
</body>
</html>