Why Is My CURL Request Through a Proxy Failing, and How Can I Fix It?

How to Use CURL via a Proxy: A Troubleshooting Guide

Using a proxy server can enhance curl's functionality, but improper setup can lead to errors. Here's a thorough analysis of your code and a solution to the issues you've encountered:

Issue 1: Missing Variable

In the initial code snippet, line 12 attempted to use $url without initializing it:

$url = '$_POST[1]';

Solution:

Initialize $url with the appropriate value from the HTML form.

Issue 2: Blank Screen

The updated code now only returns a blank screen. This is most likely because $curl_scraped_page is not echoing the output:

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);

Solution:

Set CURLOPT_RETURNTRANSFER to 1 to enable output to $curl_scraped_page.

Final Working Code:

$url = 'http://dynupdate.no-ip.com/ip.php';
$proxy = '66.96.200.39:80';

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_PROXY, $proxy);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 1);
$curl_scraped_page = curl_exec($ch);
curl_close($ch);

echo $curl_scraped_page;

Additional Notes:

• CURLOPT_PROXYUSERPWD can be used to provide username and password for proxy authentication.
• CURLOPT_HEADER can be commented out if headers are not desired in the output.
• Setting CURLOPT_PROXY to null disables the proxy for specific requests.

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