Debug HTTP API calls in WordPress

http-api-debug.php

<?php

add_action( 'http_api_debug', 'viper_http_api_debug', 15, 5 );

function viper_http_api_debug( $response, $type, $class, $args, $url ) {
	// You can change this from error_log() to var_dump() but it can break AJAX requests
	var_dump( "\n<br />" . 'Request URL: ' . var_export( $url, true ) );
	var_dump( "\n<br />" . 'Request Args: ' . var_export( $args, true ) );
	var_dump( "\n<br />" . 'Request Response : ' . var_export( $response, true ) );
}