Seven cows upload video Why sometimes there is no callback?

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Seven cows upload video Why sometimes there is no callback?

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Seven cows upload video Why sometimes there is no callback?

From seven kn

Upload process
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在七牛云存储中,整个上传流程大体分为这样几步:    业务服务器颁发 上传凭证给客户端(终端用户)    客户端凭借 上传凭证 上传文件到七牛    在七牛获得完整数据后,发起一个 HTTP 请求回调到业务服务器    业务服务器保存相关信息,并返回一些信息给七牛    七牛原封不动地将这些信息转发给客户端(终端用户)需要注意的是,【回调到业务服务器的过程是(可选的)】,它取决于业务服务器颁发的 上传凭证。如果没有回调,七牛会返回一些标准的信息(比如文件的 hash)给客户端。如果上传发生在业务服务器,以上流程可以自然简化为:    业务服务器生成 uptoken(不设置回调,自己回调到自己这里没有意义)    凭借 上传凭证 上传文件到七牛    善后工作,比如保存相关的一些信息    服务端生成 上传凭证 代码如下:
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