Firefox（或 dld 管理器）如何确定正在下载的文件的大小？
其实我想做的是愚弄浏览器，说要下载的文件是1KB，无论文件大小是多少，但它应该下载整个文件！
Actually what I want to do is to FOOL the browser by saying that the file to be downloaded is 1KB, no matter what the file size is but it should download the entire file!
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Content-length: 1024，但某些浏览器将此视为福音，并在传输该千字节后切断传输。您无法控制客户端下载后执行的操作。你最多可以给出一些提示（内容类型、长度、倾向），之后就不再由你掌控了。Content-length: 1024in the headers, but some browsers make take that as gospel and cut off the transfer after that kilobyte's transferred. You have no control over what the client does with a download. At most you can give some hints (content type, length, disposition) and after that it's out of your hands.