服务器 5xx error 错误
用上 google site map 插件已经几天了，今天查了一下状态是居然是: Error ， 真是晕菜。
| Error | Detail |
| 5xx error | Network unreachable |
不明白什么是 5xx error ， google之： URL unreachable /5xx error
See RFC 2616 for a complete list of these status codes. Likely reasons for this error are an internal server error or a server busy error. If the server is busy, it may have returned an overloaded status to ask the Googlebot to crawl the site more slowly. In this case, we’ll return again later to crawl additional pages.
原来是web server在google spider来的时候down了。 还好， 等待下次crawl。