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POHow can binary files be requested from GreaseMonkey userscripts?
 

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  1. POHow can binary files be requested from GreaseMonkey userscripts?
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    <p><strong>Backstory</strong></p> <p>I wrote a specialized image inliner script that is intended to be used with both GreaseMonkey and Google Chrome. It is supposed to download PNG files and store them in <code>data:</code> urls in image <code>src</code> attributes. This may sound ridiculous, but a certain website sets <code>Content-Disposition</code> to <code>attachment</code> for images, and I don't want the «Save As» dialog to pop up every time.</p> <p><strong>The actual question</strong></p> <p>The script fetches data with an <code>XMLHttpRequest</code>, encodes it into base64 and stores it in a proper place. So far, good. But it only works when I run it through both Firebug and Chrome dev consoles, and does not when I use it as a proper userscript. As far as I understand, this is because Greasemonkey scripts cannot use <code>XMLHttpRequest</code> objects directly and should rely on calls to <code>GM_xmlhttpRequest</code> instead. However, I cannot set <code>responseType</code> to <code>"blob"</code> or <code>"arraybuffer"</code> that way, and the <code>binary</code> parameter seems to only work for sending data through POST requests. I only get Unicode strings.</p> <p>Just in case, the images are served from the same domain as the page that links to them. I believe it satisfies the «same origin» thingy.</p> <p><a href="http://wiki.greasespot.net/GM_xmlhttpRequest" rel="nofollow">http://wiki.greasespot.net/GM_xmlhttpRequest</a> here are the GM_xmlhttpRequest docs.</p> <p>Is there a way to fetch an <code>arraybuffer</code> from within a Greasemonkey userscript?</p>
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    1. USMischa Arefiev
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    1. COpossible duplicate of [Downloading an image using XMLHttpRequest in a userscript](http://stackoverflow.com/questions/8778863/downloading-an-image-using-xmlhttprequest-in-a-userscript)
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      1. USBrock Adams
 

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