I would like to determine if a given URL is an image without relying on the file’s extension. In JavaScript, is there a way to get a URL’s HTTP response headers without retrieving the entire contents of the file?
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I would like to determine if a given URL is an image without relying on the file’s extension. In JavaScript, is there a way to get a URL’s HTTP response headers without retrieving the entire contents of the file?
You can do an http HEAD. This is covered in Accessing the web page's HTTP Headers in JavaScript
http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html