Why don't file uploads work during async postbacks?
为什么异步回送时不能使用文件上传？
Some types of postbacks might fail when using a GET request.
使用GET要求时，某些回传类型可能会失败。
In general, postbacks occur in one of two ways: through a Submit button or through a script.
通常，postback发生在下面两种方式之一：Submit按钮激发或通过script激发。
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