问题描述
我只是感兴趣firefox插件如何像DownloadHelper，能够自动找到.flv网址
im just interested how firefox plugins like DownloadHelper, is able to automatically find .flv URL
推荐答案
有一堆可能的方法和DownloadHelper似乎实现了其中的几个。如果您提取.xpi文件（这是一个ZIP文件）并查看组件文件夹，您将看到许多用于获取视频的不同处理程序。我没有彻底看过它，但你会注意到dhYoutubeProbe.js基本上从DOM中提取视频ID，然后将其插入标准的YouTube URL模式以获取FLV。
There are a bunch of possible approaches and DownloadHelper seems to implement a couple of them. If you extract the .xpi file (which is a ZIP file) and look in the components folder, you'll see a bunch of different handlers for getting videos. I haven't looked at it thoroughly but you'll notice that dhYoutubeProbe.js basically extracts the video ID from the DOM and then plugs that into a standard YouTube URL pattern for fetching FLVs.
dhNetworkProbe似乎实现了一种更加偷偷摸摸和有趣的方法 - 它监视浏览器缓存和/或HTTP请求以传输媒体文件以获取底层文件的URL。
dhNetworkProbe seems to implement a more sneaky and interesting approach - it monitors the browser cache and/or HTTP requests for transfers of media files to get the underlying file's URL.
您还可以查看Firebug或类似的监控HTTP请求和响应的方式。通过Flash播放器播放FLV会像任何其他（非流媒体）请求一样记录到Firebug。
You could also look at how Firebug or similar monitor HTTP requests and responses. Playing an FLV via Flash player logs to Firebug like any other (non-streaming) request.
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