Add --adapt-scheme flag to rewrite HTTPS URLs to HTTP in server responses (#94)

* Initial plan

* Add --adapt-scheme flag to replace HTTPS URLs with HTTP in server responses

Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>

* Apply suggestion from @swissspidy

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: swissspidy <841956+swissspidy@users.noreply.github.com>
Co-authored-by: Pascal Birchler <pascalb@google.com>

Author: Copilot

features/server.feature

@@ -51,3 +51,23 @@ Feature: Serve WordPress locally
       """
       Hello world!
       """
+
+  Scenario: Adapt HTTPS scheme to HTTP
+    Given a WP install
+    And a wp-content/mu-plugins/test-https-url.php file:
+      """
+      <?php add_filter( 'wp_head', function() { echo '<meta name="test-https" content="https://localhost:8184/wp-content/uploads/test.jpg">'; } );
+      """
+    And I run `wp option update home https://localhost:8184`
+    And I run `wp option update siteurl https://localhost:8184`
+    And I launch in the background `wp server --host=localhost --port=8184 --adapt-scheme`
+
+    When I run `curl -sS localhost:8184`
+    Then STDOUT should contain:
+      """
+      http://localhost:8184/wp-content/uploads/test.jpg
+      """
+    And STDOUT should not contain:
+      """
+      https://localhost:8184
+      """

router.php

@@ -116,6 +116,22 @@ function ( $url ) {
 
 add_filter( 'got_url_rewrite', '__return_true' );
 
+if ( getenv( 'WPCLI_SERVER_ADAPT_SCHEME' ) ) {
+	ob_start(
+		static function ( $buffer ) {
+			if ( ! isset( $GLOBALS['wpcli_server_original_url'] ) ) {
+				return $buffer;
+			}
+			$original_host = _get_full_host( $GLOBALS['wpcli_server_original_url'] );
+			return str_replace(
+				'https://' . $original_host,
+				'http://' . $_SERVER['HTTP_HOST'],
+				$buffer
+			);
+		}
+	);
+}
+
 $_SERVER['SERVER_ADDR'] = gethostbyname( $_SERVER['SERVER_NAME'] );
 $wpcli_server_root      = $_SERVER['DOCUMENT_ROOT'];
 // phpcs:ignore WordPress.WP.AlternativeFunctions.parse_url_parse_url

src/Server_Command.php

@@ -34,6 +34,10 @@ class Server_Command extends WP_CLI_Command {
 	 * [--config=<file>]
 	 * : Configure the server with a specific .ini file.
 	 *
+	 * [--adapt-scheme]
+	 * : Replace HTTPS URLs matching the original site URL with HTTP in server responses.
+	 * Useful when the site is configured with HTTPS but the development server runs on HTTP.
+	 *
 	 * [<passthrough>...]
 	 * : Optional arguments to pass to the PHP binary. Any arguments after `--`
 	 * will be passed through to the `php` command.
@@ -68,10 +72,17 @@ class Server_Command extends WP_CLI_Command {
 	 *     Document root is /var/www/public
 	 *     Press Ctrl-C to quit.
 	 *
+	 *     # Adapt HTTPS links when the site is configured with HTTPS
+	 *     $ wp server --adapt-scheme
+	 *     PHP 8.0.0 Development Server started at Wed Nov 10 18:00:00 2025
+	 *     Listening on http://localhost:8080
+	 *     Document root is /var/www/html
+	 *     Press Ctrl-C to quit.
+	 *
 	 * @when before_wp_load
 	 *
 	 * @param array<string> $args       Positional arguments passed through to the PHP binary.
-	 * @param array{host: string, port: string, docroot?: string, config?: string} $assoc_args Associative arguments passed to the command.
+	 * @param array{host: string, port: string, docroot?: string, config?: string, 'adapt-scheme'?: bool} $assoc_args Associative arguments passed to the command.
 	 * @return void
 	 */
 	public function __invoke( $args, $assoc_args ) {
@@ -123,6 +134,10 @@ public function __invoke( $args, $assoc_args ) {
 
 		$descriptors = array( STDIN, STDOUT, STDERR );
 
+		if ( Utils\get_flag_value( $assoc_args, 'adapt-scheme', false ) ) { // @phpstan-ignore argument.type
+			putenv( 'WPCLI_SERVER_ADAPT_SCHEME=1' );
+		}
+
 		// https://bugs.php.net/bug.php?id=60181
 		$options = array();
 		if ( Utils\is_windows() ) {