标头名称中不能有非ascii字元。

Header names cannot have non-ASCII chars in them.

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标头名称中不应该有空格。

Headers names should not have Spaces in them.

youdao

方法1：对订阅令牌符号的每次重复出现都使用唯一的消息头名称。

Approach 1: Use a unique header name for each iteration of the subscription token.

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仅当作为头名称的一部分，或在字符文字量或字符串文字量的引号字符之间时，空白才可以出现在预处理标记内部。

White space can appear within a preprocessing token only as a part of a header name or between the quotation characters in a character literal or string literal.

youdao

仅当作为头名称的一部分，或在字符文字量或字符串文字量的引号字符之间时，空白才可以出现在预处理标记内部。

White space can appear within a preprocessing token only as a part of a header name or between the quotation characters in a character literal or string literal.

youdao