红帽全球峰会174.10. 返回 HTTP 状态代码的默认行为
HTTP 状态代码的默认行为由 org.apache.camel.component.http.DefaultHttpBinding 类定义，该类处理如何编写响应，同时设置 HTTP 状态代码。
如果交换成功处理，则返回 200 HTTP 状态代码。
如果交换失败但异常失败，则返回 500 HTTP 状态代码，并在正文中返回堆栈追踪。如果要指定要返回的 HTTP 状态代码，请在 OUT 消息的 Exchange.HTTP_RESPONSE_CODE 标头中设置代码。
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