How to debug a get request in php using curl - php

Question

I'm trying to make a get request in php using curl. This is what I'm doing:
$curl = curl_init();
curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($curl, CURLOPT_USERPWD, "username:password");
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$result = curl_exec($curl);
curl_close($curl);
printf($result);
But $result doesn't print out anything, no success or failure message. I've successfully reached the endpoint via postman and in a web browser so I know it works. Printing out $curl prints: "Resource #1" which makes me think curl is properly installed on the server.
I'm not sure what steps to take next to make things work.

Answer 1

Add a few more option for troubleshooting purposes.
Check for an error response.
If no error, get the details:
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($ch, CURLOPT_TIMEOUT,10);
curl_setopt($ch, CURLOPT_FAILONERROR,true);
curl_setopt($ch, CURLOPT_ENCODING,"");
curl_setopt($ch, CURLOPT_VERBOSE, true);
curl_setopt($ch, CURLINFO_HEADER_OUT, true);
curl_setopt($ch, CURLOPT_HEADER, true);
$data = curl_exec($ch);
if (curl_errno($ch)){
$data .= 'Retreive Base Page Error: ' . curl_error($ch);
}
else {
$skip = intval(curl_getinfo($ch, CURLINFO_HEADER_SIZE));
$head = substr($data,0,$skip);
$data = substr($data,$skip);
$info = curl_getinfo($ch);
$info = var_export($info,true);
}
echo $head;
echo $info;

Answer 2

You can utilize curl's CURLOPT_VERBOSE and CURLOPT_STDERR like this:
$curl = curl_init();
curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
curl_setopt($curl, CURLOPT_USERPWD, "username:password");
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$verbose = fopen('php://temp', 'w+');
curl_setopt($curl, CURLOPT_VERBOSE, true);
curl_setopt($curl, CURLOPT_STDERR, $verbose);
$result = curl_exec($curl);
curl_close($curl);
rewind($verbose);
$verboseLog = stream_get_contents($verbose);
echo "Verbose information:\n<pre>", htmlspecialchars($verboseLog), "</pre>\n";
printf($result);