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nginx - What is the difference between X-Forwarded-For and X-Real-IP?

伊謝爾倫 2017-05-16 17:26:04

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What is the difference between X-Forwarded-For and X-Real-IP?

After testing, I found that the IP obtained is the same.

伊謝爾倫

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曾經(jīng)蠟筆沒(méi)有小新2017-05-16 17:28:04 1 floor

Generally speaking, X-Forwarded-For是用于記錄代理信息的，每經(jīng)過(guò)一級(jí)代理(匿名代理除外)，代理服務(wù)器都會(huì)把這次請(qǐng)求的來(lái)源IP追加在X-Forwarded-For中

A request from 4.4.4.4, the header contains such a line

X-Forwarded-For: 1.1.1.1, 2.2.2.2, 3.3.3.3

means that the request is sent by 1.1.1.1 and passes through three layers of proxies. The first layer is 2.2.2.2 and the second layer is 3.3.3.3 , and the source IP of this request1.1.1.1發(fā)出，經(jīng)過(guò)三層代理，第一層是2.2.2.2，第二層是3.3.3.3，而本次請(qǐng)求的來(lái)源IP4.4.4.4 is the third layer proxy

AndX-Real-IP，沒(méi)有相關(guān)標(biāo)準(zhǔn)，上面的例子，如果配置了X-Read-IP, there may be two situations

// 最后一跳是正向代理，可能會(huì)保留真實(shí)客戶端IP
X-Real-IP: 1.1.1.1
// 最后一跳是反向代理，比如Nginx，一般會(huì)是與之直接連接的客戶端IP
X-Real-IP: 3.3.3.3

So, if there is only one layer of proxy, the values ??of these two headers are the same

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