How Can I Debug POST Fields in PHP cURL Requests?

Debugging Post Fields in PHP cURL Requests

Understanding an existing cURL library can be challenging, especially when debugging requests. To inspect the post fields sent in a request, you have several options:

Enabling Verbose Logging

cURL provides a verbose logging feature that outputs information about the request-response process to a specified stream:

curl_setopt($curlHandle, CURLOPT_VERBOSE, true);
$streamVerboseHandle = fopen('php://temp', 'w+');
curl_setopt($curlHandle, CURLOPT_STDERR, $streamVerboseHandle);

After executing the request, you can rewind the stream and read its contents, which will contain the verbose log.

Retrieving Metrics with curl_getinfo

In addition to verbose logging, cURL offers the curl_getinfo function to retrieve metrics about the last request. This information can include details about the URL, HTTP status code, content type, timing, and transfer rates:

$metrics = curl_getinfo($curlHandle);

This data can be helpful for debugging performance issues or other request-related problems.

Custom Debugging Function

You can also create a custom function to wrap the curl_getinfo call and provide a more user-friendly representation of the metrics:

function curl_metrics($curlHandle) {
  $info = curl_getinfo($curlHandle);
  $version = curl_version();
  return sprintf("URL: %s\nHTTP Status: %d (%d redirect(s) in %d seconds)\nContent: %s\nSize: %d\nTime: %d seconds",
    $info['url'], $info['http_code'], $info['redirect_count'], $info['redirect_time'],
    $info['content_type'], $info['total_time'], $version['version']);
}

By incorporating these techniques into your debugging process, you can gain insights into the behavior of your cURL requests and efficiently address any issues that may arise.

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