Request. servervariables ("http_referer") Prevent download leeching

How request. servervariables ("http_referer") Works

In the following cases, the request. servervariables ("http_referer") is obtained from the address bar of the browser:
1. directly use <a href>
2. Form submitted with submit or <input type = image> (post or get)
3. Form submitted using JScript (post or get)

Request. servervariables ("http_referer") cannot be set properly:
1. Link from favorites
2. Click home or custom address.
3. Use location. href or location. Replace () of JScript ()
4. Enter the address in the browser.
5. <% response. Redirect %>
6. <% response. addheader %> or <meta http-equiv = Refresh> redirect
7. Load the address in XML

Apparently, request. servervariables ("http_referer") cannot work normally in most cases. For this reason, we can make request only when downloading leeching. servervariables ("http_referer ").

For example:

Below isCodeFragment: 'Download the system URL list. Do not include http :// Domain = "2ky.cn, 61.156.14.223 ″ Spldomain = Split (domain ,",") Strreferer = request. servervariables ("http_referer ") For IIi = 0 to ubound (spldomain) If instr (strreferer, trim (spldomain (III)> 0 then ishttp = true Next If isnull (strreferer) or ishttp = false then Response. write "the download link comes from illegal leeching. <a href =" http://www.2ky.cn/"> please go to the sharing century page and download it again. </A>" Closedatabase Response. End End if

The download system URL list is the domain name or IP address used to access your download page. For example, you can use multiple URLs to access your download page, which can be separated by commas.