outgoingMessage.hasHeader(name)

• name <string>

• 返回：<boolean>

  ¥Returns: <boolean>

如果 name 标识的标头当前设置在传出标头中，则返回 true。标头名称不区分大小写。

¥Returns true if the header identified by name is currently set in the outgoing headers. The header name is case-insensitive.

const hasContentType = outgoingMessage.hasHeader('content-type'); 拷贝