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$ IP = $ _ SERVER ['remote _ ADDR '] How does one obtain an IP address? The HTTP header does not contain this field.

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$ IP $ _ SERVER [REMOTE_ADDR] How does one obtain an IP address? This field does not exist in the HTTP header. $ IP = $ _ SERVER ['remote _ ADDR '] What is the principle of obtaining an IP address? The HTTP header does not contain this field.


Reply to discussion (solution)

It extracts the ip from the TCP/IP packet for your reference.

It extracts the ip from the TCP/IP packet for your reference.

It extracts the ip from the TCP/IP packet for your reference.


That is to say, when the TCP handshake occurs, what belongs to the network layer?

Yes!

REMOTE_ADDR is a CGI environment variable.

I know the reason. thank you for choosing the first floor.

I know the reason. thank you for choosing the first floor.

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