This is all explained in the HTTP 1.1 Header Field Definitions: However, since the browser knows the number of downloaded bytes, when you click "resume", it can request the file download to be continued at exactly this point, with the HTTP Range field. If you then click "pause", the connection will just be aborted. Now, when you start a download, your browser will download the file as usual, but it will of course also keep track of the bytes downloaded and store everything in a temporary file. Content-Length tells you the whole size of the file.Accept-Ranges means that you can access the file part-by-part, if needed.What's important about this are the Content-Length and the Accept-Ranges fields. If the size of the file requested is known, the HTTP header reveals the "Content Length" to your browser.įor example, I'm trying to download a PDF file, and here's the response: charon:~ werner$ curl -I HTTP/1.1 200 OKĮTag: "230b73353fc7715f06267967df11be04:1241094925" The server responds with a HTTP message, which consists of a header and the actual content. It works as follows: Whenever you download a file, you send a HTTP request to the server with the file in question.
So, does the "pause" feature really work?
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