Another header that you might want to set explicitly is content-id.

您可能希望显式地设置的另一个标头是Content - id。

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Let's assume you want to add an attachment under a new Content-Id, Id2.

假设您希望在新的Content - Id Id 2下添加一个附件。

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Let's assume you want to add an attachment under a new Content-Id, Id2.

假设您希望在新的Content - Id Id 2下添加一个附件。

youdao