上传文件错误！
第一次以后的每次上传都会产生错误18,curle_partial_file，提示文件传输没有全部完成。
Every upload after the first yields error 18, CURLE_PARTIAL_FILE, claiming that the file was not completely transferred.
最后，我们需要对大于1 MB的上传文件进行错误处理。
The last thing we need to do is add some error-handling code for uploads larger than 1mb.
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