IPvFoo：Display the server IP address, with a realtime summary of IPv4, IPv6, and HTTPS information across all page elements（所有页面元素）.
Here’s one of the first extensions to use the new webRequest API in Chrome 17. It watches as the browser downloads a webpage, picks out various bits of protocol-related information（协议相关信息）, and squishes it down into a convenient table（表）. Everything’s captured and displayed privately, without creating any additional network traffic.
The first thing you’ll see is an icon in the location bar（地址栏）. A large 4 or 6 shows whether the outer page（外部页面） was fetched using IPv4 or IPv6. If the page contains elements from other domains, then smaller numbers will appear alongside（在旁边） for those.
When you click the icon, a table pops up（弹出）, containing a row of information for each domain:
– A padlock icon（挂锁图标）, for HTTP, HTTPS, or a mix（混合） of both. This is helpful for tracking down mixed content warnings（混合内容警告）, but you shouldn’t treat it as absolute security advice.
– The IPv4 or IPv6 address. If connections span（跨越） more than one IP, then the most recent one wins. When the connection is still open, the address is highlighted in yellow.
– A “cached” symbol. This mainly exists to warn you that no actual connections（实际连接） took place, so the IP address might be stale（过时的）.
For convenient copying, clicking on a hostname（主机名） or address will select it. There’s also a right-click option to look up IP addresses with bgp.he.net. I’m not affiliated with that service, but it’s my personal favorite.
IPvFoo is Free Software (Apache 2.0 license).