ASP uses Request. ServerVariables to obtain the real IP address of the client

As we all know, using Request in ASP. serverVariables ("REMOTE_ADDR") can obtain the client's IP address. However, if the client uses a proxy server for access, the obtained IP address is the proxy server's IP address rather than the real client IP address. But how can I obtain the IP address of the client server? The following is a small Editor of the customer's house.

In fact, to obtain the real IP address of the client through the proxy server, you need to use Request. ServerVariables ("HTTP_X_FORWARDED_FOR") to read.

However, not every proxy server can use Request. serverVariables ("HTTP_X_FORWARDED_FOR") to read the real IP address of the client, some of which are still the IP address of the proxy server.

Note that if the client is not accessed through the proxy server, the value obtained using Request. ServerVariables ("HTTP_X_FORWARDED_FOR") will be null. Therefore, if you want to use this method in the program, you can do this:

......

Userip = Request. ServerVariables ("HTTP_X_FORWARDED_FOR ")

If userip = "" Then userip = Request. ServerVariables ("REMOTE_ADDR ")

......

That is, if the client uses the proxy server, the value of HTTP_X_FORWARDED_FOR is obtained. If the client does not pass the proxy server, the value of REMOTE_ADDR is obtained. Is this method very practical? Add it to favorites! It may be used.

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