asp.net中RewritePath重新導向HTTP頭Content-Location暴露真實路徑

ASP.NET使用RewritePath重新導向後，伺服器響應的HTTP頭會多個Content-Location：

HTTP/1.1 200 OK
Content-Length: 48150
Content-Type: image/jpeg
Content-Location: http://www.111cn.net /test.jpg
Last-Modified: Tue, 18 Dec 2012 15:01:50 GMT
Accept-Ranges: bytes
ETag: "e119ee9b30ddcd1:1c48"
Server: Microsoft-IIS/6.0
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Date: Mon, 08 Sep 2014 01:29:40 GMT

Content-Location值為重新導向檔案的真實路徑，在一些場合下我們不想讓用戶端知道這個路徑，有辦法去掉它嗎？去不掉，但可以手工在IIS中給網站設定一個同名HTTP頭藉以隱藏真實路徑：

HTTP/1.1 200 OK
Content-Length: 48150
Content-Type: image/jpeg
Content-Location: mzwu.com
Last-Modified: Tue, 18 Dec 2012 15:01:50 GMT
Accept-Ranges: bytes
ETag: "e119ee9b30ddcd1:1c58"
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
Date: Mon, 08 Sep 2014 01:42:50 GMT