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    <p>EDIT : before going too far, you may want to check this other answer relying on apache configuration : <a href="https://stackoverflow.com/questions/307679/using-jquery-restricting-file-size-before-uploading#307861">Using jQuery, Restricting File Size Before Uploading</a> . the description below is only useful if you really need even more custom feedback.</p> <p>Yes, you can get some information upfront, before allowing the upload of the whole file.</p> <p>Here's an example of header coming from a form with the <code>enctype="multipart/form-data"</code> attribute :</p> <pre><code>POST / HTTP/1.1 Host: 127.0.0.1:8000 User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.0.3) Gecko/2008092414 Firefox/3.0.3 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.7,fr-be;q=0.3 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 300 Connection: keep-alive Content-Type: multipart/form-data; boundary=---------------------------886261531333586100294758961 Content-Length: 135361 -----------------------------886261531333586100294758961 Content-Disposition: form-data; name=""; filename="IMG_1132.jpg" Content-Type: image/jpeg (data starts here and ends with -----------------------------886261531333586100294758961 ) </code></pre> <p>You have the Content-Length in the header, and additionally there is the Content-Type in the header of the file part ( each file has its own header, which is the purpose of multipart encoding ). Beware that it's the browser responsibility to set a relevant Content-Type by guessing the file type ; you can't guarantee it, but it should be fairly reliable for early rejection ( yet you'd better check the whole file when it's entirely available ).</p> <p>Now, there is a gotcha. I used to filter image files like that, not on the size, but on the content-type ; but as you want to stop the request as soon as possible, the same problem arises : <strong>the browser only gets your response once the whole request is sent, including form content and thus uploaded files</strong>.</p> <p>If you don't want the provided content and stop the upload, you have no choice but to brutally close the socket. The user will only see a confusing "connection reset by peer" message. And that sucks, but it's by design.</p> <p>So you only want to use this method in cases of background asynchronous checks ( using a timer that checks the file field ). So I had that hack :</p> <ul> <li>I use jquery to tell me if the file field has changed</li> <li>When a new file is chosen, <em>disable all other file fields on the same form</em> to get only that one.</li> <li>Send the file asynchronously ( jQuery can do it for you, it uses a hidden frame )</li> <li>Server-side, check the header ( content-length, content-type, ... ), cut the connection as soon as you got what you need.</li> <li>Set a session variable telling if that file was OK or not.</li> <li>Client-side, as the file is uploaded to a frame <strong>you don't even get any kind of feedback if the connection is closed</strong>. Your only alternative is a timer.</li> <li>Client-side, a timer polls the server to get a status for the uploaded file. Server side, you have that session variable set, send it back to the brower.</li> <li>The client has the status code ; render it to your form : error message, green checkmark/red X, whatever. Reset the file field or disable the form, you decide. Don't forget to re-enable other file fields.</li> </ul> <p>Quite messy, eh ? If any of you has a better alternative, I'm all ears.</p>
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