本文介绍了一种测量网络上传下载带宽的方法，通过快速上传或下载1MB数据并记录时间来估算当前可用带宽，定期测量确保准确性。
出处：https://stackoverflow.com/questions/20190456/determine-available-upload-download-bandwidth
There's no way to determine the absolute network capacity between two points on a regular network. The reason is that the traffic can be rerouted in between, other data streams appear or disappear or links can be severed.
What you can do is figure out what is the available bandwidth right now. One way to do it is to upload/download a chunk of data (say 1MB) as fast as possible (no artificial caps), and measure how long it takes. From there you can figure out what bandwidth is available now and go from there.
You could periodically measure the bandwidth again to make sure you're not too way off.
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