响应中的标头“VTag”是什么？
我使用 curl 请求 MS 的 jquery cdn，并得到以下响应：
C:\Documents and Settings\zhidao.it>curl http://ajax.microsoft.com/ajax/jquery/jquery-1.4.2.min.js -I
HTTP/1.1 200 OK
Cache-Control: public,max-age=31536000
Content-Length: 72413
Content-Type: application/x-javascript
Accept-Ranges: bytes
ETag: "90df7dfe29b4ca1:0"
Server: Microsoft-IIS/7.5
VTag: 79140211700000000
P3P: CP="ALL IND DSP COR ADM CONo CUR CUSo IVAo IVDo PSA PSD TAI TELo OUR SAMo CNT COM INT NAV ONL PHY PRE PUR UNI"
X-Powered-By: ASP.NET
Age: 15694
Date: Sun, 17 Apr 2011 11:16:14 GMT
Last-Modified: Tue, 23 Feb 2010 01:46:18 GMT
Expires: Mon, 16 Apr 2012 06:54:40 GMT
Connection: keep-alive
我注意到有一个奇怪的标头 VTag。我用谷歌搜索过，但什么也没找到。那是什么？以及如何使用它？
I use curl to request MS' jquery cdn, and get the follow response:
C:\Documents and Settings\zhidao.it>curl http://ajax.microsoft.com/ajax/jquery/jquery-1.4.2.min.js -I
HTTP/1.1 200 OK
Cache-Control: public,max-age=31536000
Content-Length: 72413
Content-Type: application/x-javascript
Accept-Ranges: bytes
ETag: "90df7dfe29b4ca1:0"
Server: Microsoft-IIS/7.5
VTag: 79140211700000000
P3P: CP="ALL IND DSP COR ADM CONo CUR CUSo IVAo IVDo PSA PSD TAI TELo OUR SAMo CNT COM INT NAV ONL PHY PRE PUR UNI"
X-Powered-By: ASP.NET
Age: 15694
Date: Sun, 17 Apr 2011 11:16:14 GMT
Last-Modified: Tue, 23 Feb 2010 01:46:18 GMT
Expires: Mon, 16 Apr 2012 06:54:40 GMT
Connection: keep-alive
I noticed there is a strange header VTag. I have googled for it, but found nothing. What is that? and how to use it?
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如果它没有在任何地方的互联网上记录，那么它可能是 MS 内部使用的。可能与虚拟服务器有关？
您在其他网站（非 MS 网站）上看到过它吗？
If it's not documented on the interwebs anywhere, it's probably used internally by MS. Possibly to do with virtual servers?
Have you seen it on other sites (non-MS ones)?
我猜它标识了您请求的对象的同级/版本。
I guess it identifies the sibling/version of the object you're requesting.