Nodejs getting the client IP address

Why to get client IP:

PHP: We need to get the IP information of the user client to identify the user location, but now we get the address is always Hangzhou front-end: I check, a little wait .... Understand, we added a layer node server, the server in Hangzhou, you get the node server ipphp: What to do? Front end: I'll give you an IP field. php: Oh, the front end: (crackling ...) Okay, do you have a look at the value? PHP: Yes, but the value is not right, you pass to me is  :: FFFF:127.0. 0.1

Analysis Reason:

The IP field value of the front-end to PHP is req.connection.remoteAddress , theoretically nothing wrong, but actually get is IPv6 address, PHP need IPv4 address.

Nodejs website API:

NET Module Lookup Server.listen ()

Server.listen ([port][, host][, backlog][, callback])

Start a TCP service to listen for the input port and host.

If host is omitted, if IPv6 is available, the server will receive a link based on unspecified IPv6 address (::), otherwise receive unspecified IPV4 address (0.0.0.0)

Modification Method:

Specifies that the host parameter is 0.0.0.0, which is listen (port, ' 0.0.0.0 ', () = {});

For example:

Final Result:

Front End: Yes, you can look at PHP: I'll try ~ wait ... ok,bingo.

Summarizes a method of acquiring IP:

/** *function  getclientip (req    ) {return//  Determine if there is a reverse proxy IP        // determine the IP of the connection remote IP        //  judgment backend socket         req.connection.socket.remoteAddress;};

Nodejs getting the client IP address