Why could Curl be slower than a web browser?

I am using this class to make one GET and another POST request to a website (the first request is to set a cookie). I am testing in a Win XP virtual machine with virtualbox, using wamp from wampserver dot com. The 2 requests takes from 10 to 18 seconds (with curl), but if I make those request directly via the webbrowser in that same virtual machine the website loads in just a few seconds, and it retrieves all the images, css, etc.

What could be causing curl开发者_StackOverflow中文版 to work so slow? is there a way to fix it?

I faced the same issue, using the curl command.

as suggested above - forcing ipv4 only dns lookup fixed it.

curl -4 $url # nice and fast

(I already had ::1 localhost in my hosts file - but that didn't help).

Curl is probably trying to Reverse DNS the server and, as it cant, it just hangs there a little waiting for the timeout.

If the timeout is given by IPV6 you can try CURL_IPRESOLVE_V4 to bypass it altogether. It really depends on your machine configuration and is more a question to Server Fault.

Check your web server logs and try to find any difference between the requests from the normal web browser and the requests from curl

It is probably due to IPv6.

Try add

curl_setopt($ch, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4 );

I ran into this issue with a local web server. I was able to fix by adding

::1 localhost

to /etc/hosts/ file.

This is the ipv6 notation for 127.0.0.1