Fixed crash when trying to resolve schema based on USE_HTTPS env var

CHANGELOG.md

@@ -4,6 +4,23 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com), and this project adheres to [Semantic Versioning](https://semver.org).
 
+## [Unreleased]
+### Added
+* *Nothing*
+
+### Changed
+* *Nothing*
+
+### Deprecated
+* *Nothing*
+
+### Removed
+* *Nothing*
+
+### Fixed
+* [#1201](https://github.com/shlinkio/shlink/issues/1201) Fixed crash when using the new `USE_HTTPS`, as it's boolean raw value was being used instead of resolving "https" or "http".
+
+
 ## [2.9.0] - 2021-10-10
 ### Added
 * [#1015](https://github.com/shlinkio/shlink/issues/1015) Shlink now accepts configuration via env vars even when not using docker.

config/autoload/url-shortener.global.php

@@ -10,14 +10,22 @@ use const Shlinkio\Shlink\MIN_SHORT_CODES_LENGTH;
 return (static function (): array {
     $shortCodesLength = (int) env('DEFAULT_SHORT_CODES_LENGTH', DEFAULT_SHORT_CODES_LENGTH);
     $shortCodesLength = $shortCodesLength < MIN_SHORT_CODES_LENGTH ? MIN_SHORT_CODES_LENGTH : $shortCodesLength;
-    $useHttps = env('USE_HTTPS'); // Deprecated. For v3, set this to true by default, instead of null
+    $resolveSchema = static function (): string {
+        $useHttps = env('USE_HTTPS'); // Deprecated. For v3, set this to true by default, instead of null
+        if ($useHttps !== null) {
+            $boolUseHttps = (bool) $useHttps;
+            return $boolUseHttps ? 'https' : 'http';
+        }
+
+        return env('SHORT_DOMAIN_SCHEMA', 'http');
+    };
 
     return [
 
         'url_shortener' => [
             'domain' => [
                 // Deprecated SHORT_DOMAIN_* env vars
-                'schema' => $useHttps !== null ? (bool) $useHttps : env('SHORT_DOMAIN_SCHEMA', 'http'),
+                'schema' => $resolveSchema(),
                 'hostname' => env('DEFAULT_DOMAIN', env('SHORT_DOMAIN_HOST', '')),
             ],
             'validate_url' => (bool) env('VALIDATE_URLS', false), // Deprecated