Test for content-length mismatch problems with Drupal repository

drupal_repo_test.php

<?php

// Test for content-length mismatch problems with Drupal repository
// (adapted from mickaelperrin/test.php)

// william@wturrell.co.uk 20161031

$test_urls = [
    'http://cgit.drupalcode.org/drupal/plain/.csslintrc?h=8.2.1',
    'http://cgit.drupalcode.org/drupal/plain/.htaccess?h=8.2.1',
    'http://cgit.drupalcode.org/drupal/plain/.eslintignore?h=8.2.1',
    'http://cgit.drupalcode.org/drupal/plain/.eslintrc?h=8.2.1',
    'http://cgit.drupalcode.org/drupal/plain/.gitattributes?h=8.2.1',
    'http://cgit.drupalcode.org/drupal/plain/index.php?h=8.2.1',
    'http://cgit.drupalcode.org/drupal/plain/robots.txt?h=8.2.1',
    'http://cgit.drupalcode.org/drupal/plain/sites/default/default.settings.php?h=8.2.1',
    'http://cgit.drupalcode.org/drupal/plain/sites/default/default.services.yml?h=8.2.1'
];

foreach ($test_urls as $url) {
    // Test each file in turn
    echo "Testing: " . $url;

    test_download( [ 'protocol_version' => 1.1 ], $url);
    test_download( [ 'protocol_version' => 1.0 ], $url);
    echo "\n\n";
}

function test_download(array $http_headers, string $url)
{
    $protocol = sprintf('%0.1f', $http_headers['protocol_version']);

    echo "\nHTTP protocol " . $protocol;
    $context = array(
        'http' => $http_headers
    );

    $ctx    = stream_context_create($context);
    $result = file_get_contents($url, false, $ctx);
    analysis($result, $http_response_header);
}


function analysis(string $result, array $http_response_header)
{
    $result_content_length = strlen($result);
    $header_content_length = null;
    $etag = null;

    foreach ($http_response_header as $header) {
        if (preg_match('{^content-length:\s*(.+?)\s*$}i', $header, $match)) {
            $header_content_length = $match[1];
        }
        if (preg_match('{^etag:\s*(.+?)\s*$}i', $header, $match)) {
            $etag = $match[1];
        }

    }

    if ($result_content_length == $header_content_length) {
        echo "\n[SUCCESS] Content-lengths match (" . $header_content_length . ")";
    } else {
        echo "\n[FAIL] Content-lengths different ", sprintf("\nDownloaded: %d vs reported: %d", $result_content_length, $header_content_length);
        if ( ! empty($etag)) {
            echo "\nEtag = ".$etag;
        }
    }
}