WP HTTP Debug

wp_http_debug.php

<?php

add_action( 'http_api_debug', 'viper_http_api_debug', 10, 5 );

public function viper_http_api_debug( $response, $type, $class, $args, $url ) {
    $output = 'Request URL: ' . var_export( $url, true );
    $output .= 'Request Args: ' . var_export( $args, true );
    $output .= 'Request Response : ' . var_export( $response, true );

    echo $output;
}