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POSending/Displaying a base64 encoded Image
 

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    <p>I need to send a <code>base64</code> encoded string to a client. Therefore, I'm opening and reading an image file on the server, encode it and send that data along with the <code>image/jpeg</code> content-type to the browser. <strong>Example in php:</strong></p> <pre><code>$image = $imagedir . 'example.jpg'; $image_file = fopen($image, 'r'); $image_data = fread($image_file, filesize($image)); header("Content-type: image/jpeg"); echo 'data:image/jpeg;base64,' . base64_encode($image_data); </code></pre> <p><strong>Clientside</strong>, I'm calling:</p> <pre><code>var img = new Image(); img.src = "http://www.myserver.com/generate.php"; img.onerror = function(){alert('error');} $(img).appendTo(document.body); </code></pre> <p>That does not work for some reason. <code>onerror</code> always fires. Watching the FireBug <code>Network task</code> for instance, tells me that I'm receiving the correct header information and a correct value of transfered bytes.</p> <p>If I send that data as <code>Content-type: text/plain</code> it works, the <code>base64</code> string is shown in the browser (if I call the script directly). Copying and pasting that output into the <code>src</code> of a <code>&lt;img&gt;</code> element shows the image as expected.</p> <p>What am I doing wrong here?</p> <p><strong>Solution</strong></p> <p>Thanks <code>Pekka</code> for pointing me on my mistake. You don't need (you can't!) encode that binary image data as base64 string in that kind of approach. Without base64 encoding, it just works.</p>
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    1. COLooks like you should be setting the `src` attribute's value to the response text directly (i.e. `img.src = "data:image/jpeg;base64,..."`... and the right-hand side here could be a return value from an Ajax call) - otherwise the browser will try to request an image from the URL you're setting it to, which won't work because it's returning `data:image...` instead of the image bytes directly.
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    2. COWhat do you want to do?
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    3. COI don't want the overhead of an `ajax call`. I need it as quick as even possible. To get somekind of a 'response' I need a valid image to check for a width for instance.
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