Any library that supports custom HTTP headers, such as libcurl, will work.
You need to spawn several threads. In each thread, set the Range field in you request header to specify which part of the file this thread needs to download.
And for libcurl specially, you can use the CURLOPT_RANGE option to do partial file download.
Pass a char * as parameter, which should contain the specified range you want. It should be in the format "X-Y", where X or Y may be left out. HTTP transfers also support several intervals, separated with commas as in "X-Y,N-M". Using this kind of multiple intervals will cause the HTTP server to send the response document in pieces (using standard MIME separation techniques). For RTSP, the formatting of a range should follow RFC 2326 Section 12.29. For RTSP, byte ranges are not permitted. Instead, ranges should be given in npt, utc, or smpte formats.
Pass a NULL to this option to disable the use of ranges.
Ranges work on HTTP, FTP, FILE (since 7.18.0), and RTSP (since 7.20.0) transfers only.
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任何支持自定义 HTTP 标头的库（例如 libcurl）都可以使用。
您需要生成多个线程。在每个线程中，设置请求标头中的
Range字段以指定该线程需要下载文件的哪一部分。特别是对于 libcurl ，您可以使用
CURLOPT_RANGE选项来执行部分操作文件下载。请参阅 libcurl 的 文档。
Any library that supports custom HTTP headers, such as libcurl, will work.
You need to spawn several threads. In each thread, set the
Rangefield in you request header to specify which part of the file this thread needs to download.And for libcurl specially, you can use the
CURLOPT_RANGEoption to do partial file download.See the description form libcurl's documentation.