outgoingMessage.setHeader(name, value)

• name <string> 标头名称

  ¥name <string> Header name

• value <any> 标头值

  ¥value <any> Header value

• 返回：<this>

  ¥Returns: <this>

设置单个标头值。如果待发送标头中已经存在该标头，则替换其值。使用字符串数组发送多个同名标头。

¥Sets a single header value. If the header already exists in the to-be-sent headers, its value will be replaced. Use an array of strings to send multiple headers with the same name.