Curious questions about Curl

[teguh123]

curl_setopt ($ch, CURLOPT_INTERFACE, $ipUsed);

If we do not use this command, can anyone tell me what would be the IP used by curl?

Usually I set this up as $_SERVER['SERVER_ADDR']

However, when I install my own server

$_SERVER['SERVER_ADDR'] is 127.0.0.1

Setting curl_setopt ($ch, CURLOPT_INTERFACE, '127.0.0.1'); will means that curl will stop working.

If I do not call the line, curl will work though.

So I wonder what's the default CURLOPT_INTERFACE that curl use if we do not use curl_setopt ($ch, CURLOPT_INTERFACE, $ipUsed);

[bpat1434]

cURL should use the IP of the default ethernet interface. So if you have only one IP for your home, and you use a router to serve your network, then cURL will use the internal IP it gets (192.168.x.x) instead of 127.0.0.1.

Now I'm not 100% absolutely certain that that's entirely true; however, there is a simple solution:
Create a php page which just gives back the $_SERVER['REMOTE_ADDR']; of the request, and point cURL to there 😉 Answer your question in about 2 minutes 😉