Shulou(Shulou.com)06/01 Report--

Today, I will talk to you about how to get client-side IP in server-side applications. Many people may not know much about it. In order to make you understand better, the editor has summarized the following for you. I hope you can get something according to this article.

If there is a request header for x-forwarded-for, take the first IP, otherwise take the remoteAddr to establish a connection to the socket.

X-forwarded-for has basically become a standard HTTP header based on proxy. The format is as follows. You can see that the first IP represents its real IP. Please refer to MDN X-Forwarded-For [1].

X-Forwarded-For: 203.0.113.195, 70.41.3.18, 150.172.238.178

X-Forwarded-For:,

Here is how koa gets the IP

Get ips () {

Const proxy = this.app.proxy

Const val = this.get (this.app.proxyIpHeader)

Let ips = proxy & & val

? Val.split (/\ sstories,\ slots /)

: []

If (this.app.maxIpsCount > 0) {

Ips = ips.slice (- this.app.maxIpsCount)

}

Return ips

}

Get ip () {

If (! this [IP]) {

This [IP] = this.ips [0] | | this.socket.remoteAddress | |''

}

Return this [IP]

}

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