On the client side, when a user sends or receives a file attachment, the client code has to handle the base64 encoding and decoding itself.
在客户端，当一名用户发送或接收一个文件附件时，客户机代码必须处理base64编码，并自行解码。
On the client side, when a user sends or receives a file attachment, the client code has to handle the base64 encoding and decoding itself.
在客户端，当一名用户发送或接收一个文件附件时，客户机代码必须处理base64编码，并自行解码。
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