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This article is about how to use Nginx reverse proxy to get real IP, the editor thinks it is very practical, so I share it with you to learn. I hope you can get something after reading this article.

I. Preface

In solving the WebApi cross-domain secondary request and the Vue single page problem, Nginx solves the secondary request caused by the cross-domain problem, but it also gives rise to a new problem, that is, if you need to obtain a user's IP, the IP address is always the local address.

Second, the reason

Because after the Nginx reverse proxy, the IP obtained in the application is the IP of the reverse proxy server, and the domain name obtained is also the domain name of the Url configured by the reverse proxy.

III. Solutions

To solve this problem, you need to add some configuration information to the Nginx reverse proxy configuration in order to pass the real IP and domain name of the client to the application. At the same time, you need to modify the method of obtaining the IP address.

It is important to note, however, that after a reverse proxy through Nginx, if you go through several layers of proxies to access IP, the IP address you may get is in this format: clientIP,proxy1,proxy2.

If you need to insert an IP address into the database, you need to do something to prevent injection. Therefore, it is necessary to intercept the format of the above IP address.

3.1 Nginx is configured as follows

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Server {

Listen 9461; # listener port number

Server_name localhost 192.168.88.22; # access address

Location / {

Root project path; # for example: E:/Publish/xxx/

Index index.html

# this is used to deal with the problem of rewriting when Vue, Angular and React use H5's History

If (!-e $request_filename) {

Rewrite ^ (. *) / index.html last

Break

}

}

# proxy server interface

Location / api {

Proxy_pass http://localhost:9460/api;# proxy interface address

# Host configuration and domain name delivery

Proxy_set_header Host $host

Proxy_set_header X-Real-IP $remote_addr

Proxy_set_header REMOTE-HOST $remote_addr

Proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for

}

}

3.2 C # code to get the real IP method

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# region Ip (client IP address)

/ / /

/ / client IP address

/ / /

Public static string Ip

{

Get

{

Var result = string.Empty

If (HttpContext.Current! = null)

{

Result = GetWebClientIp ()

}

If (string.IsNullOrWhiteSpace (result))

{

Result = GetLanIp ()

}

Return result

}

}

/ / /

/ get the IP of the Web client

/ / /

/ / /

Private static string GetWebClientIp ()

{

Var ip = GetWebProxyRealIp ()? GetWebRemoteIp ()

Foreach (var hostAddress in Dns.GetHostAddresses (ip))

{

If (hostAddress.AddressFamily = = AddressFamily.InterNetwork)

{

Return hostAddress.ToString ()

}

}

Return string.Empty

}

/ / /

/ get Web remote IP

/ / /

/ / /

Private static string GetWebRemoteIp ()

{

Try

{

Return HttpContext.Current.Request.ServerVariables ["HTTP_X_FORWARDED_FOR"]?

HttpContext.Current.Request.ServerVariables ["REMOTE_ADDR"]?

}

Catch (Exception e)

{

Return string.Empty

}

}

/ / /

/ get the real IP of Web proxy

/ / /

/ / /

Private static string GetWebProxyRealIp ()

{

Var request = HttpContext.Current.Request

String ip = request.Headers.Get ("x-forwarded-for")

If (string.IsNullOrEmpty (ip) | | string.Equals ("unknown", ip, StringComparison.OrdinalIgnoreCase))

{

Ip = request.Headers.Get ("Proxy-Client-IP")

}

If (string.IsNullOrEmpty (ip) | | string.Equals ("unknown", ip, StringComparison.OrdinalIgnoreCase))

{

Ip = request.Headers.Get ("WL-Proxy-Client-IP")

}

If (string.IsNullOrEmpty (ip) | | string.Equals ("unknown", ip, StringComparison.OrdinalIgnoreCase))

{

Ip = request.UserHostAddress

}

If (string.IsNullOrEmpty (ip))

{

Return string.Empty

}

/ / the following formats may exist: X-Forwarded-For: client, proxy1, proxy2

If (ip.Contains (",")

{

/ / if there are multiple reverse proxies, the resulting IP is a comma-separated collection of IP, taking the first

/ / X-Forwarded-For: the first client

String [] ips = ip.Split (new string [1] {","}, StringSplitOptions.RemoveEmptyEntries)

Var I = 0

For (I = 0; I)

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