metadataHeaders选项失败，并带有多个标题 [英] metadataHeaders option failing with multiple headers

问题描述

这是我的代码段:

    if messages['messages']:
        for message in messages['messages']:
            batch.add(gmail_client.users().messages().get(userId='me', id=message['id'], format='metadata', fields="payload,threadId,id", metadataHeaders="from,to,date,subject"), callback=messageCallback)

    batch.execute()

这仅适用于metadataHeaders中的一个选项，但是列出了多个标头，它根本不返回任何标头.有什么想法吗?

This works fine with just one option in metadataHeaders, but with multiple headers listed it's not returning any headers at all. Any ideas?

推荐答案

只需弄清楚就可以了.文档不正确，此参数的正确格式是字符串数组，而不是单个字符串.您可以在此页面上看到错误:

Just figured it out. The documentation is incorrect, the correct format for this parameter is an array of strings rather than a single string. You can see the error on this page:

https://developers.google.com/gmail/api/v1/reference/users/messages/get

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