ResourceLoaderTest.php

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<?php
 
use Wikimedia\TestingAccessWrapper;
 
class ResourceLoaderTest extends ResourceLoaderTestCase {
 
    protected function setUp() {
        parent::setUp();
 
        $this->setMwGlobals( [
            'wgResourceLoaderLESSImportPaths' => [
                dirname( dirname( __DIR__ ) ) . '/data/less/common',
            ],
            'wgResourceLoaderLESSVars' => [
                'foo'  => '2px',
                'Foo' => '#eeeeee',
                'bar' => 5,
            ],
            // Clear ResourceLoaderGetConfigVars hooks (called by StartupModule)
            // to avoid notices during testMakeModuleResponse for missing
            // wgResourceLoaderLESSVars keys in extension hooks.
            'wgHooks' => [],
            'wgShowExceptionDetails' => true,
        ] );
    }
 
    public function testConstructRegistrationHook() {
        $resourceLoaderRegisterModulesHook = false;
 
        $this->setMwGlobals( 'wgHooks', [
            'ResourceLoaderRegisterModules' => [
                function ( &$resourceLoader ) use ( &$resourceLoaderRegisterModulesHook ) {
                    $resourceLoaderRegisterModulesHook = true;
                }
            ]
        ] );
 
        $unused = new ResourceLoader();
        $this->assertTrue(
            $resourceLoaderRegisterModulesHook,
            'Hook ResourceLoaderRegisterModules called'
        );
    }
 
    public function testRegisterValidObject() {
        $module = new ResourceLoaderTestModule();
        $resourceLoader = new EmptyResourceLoader();
        $resourceLoader->register( 'test', $module );
        $this->assertEquals( $module, $resourceLoader->getModule( 'test' ) );
    }
 
    public function testRegisterValidArray() {
        $module = new ResourceLoaderTestModule();
        $resourceLoader = new EmptyResourceLoader();
        // Covers case of register() setting $rl->moduleInfos,
        // but $rl->modules lazy-populated by getModule()
        $resourceLoader->register( 'test', [ 'object' => $module ] );
        $this->assertEquals( $module, $resourceLoader->getModule( 'test' ) );
    }
 
    public function testRegisterEmptyString() {
        $module = new ResourceLoaderTestModule();
        $resourceLoader = new EmptyResourceLoader();
        $resourceLoader->register( '', $module );
        $this->assertEquals( $module, $resourceLoader->getModule( '' ) );
    }
 
    public function testRegisterInvalidName() {
        $resourceLoader = new EmptyResourceLoader();
        $this->setExpectedException( 'MWException', "name 'test!invalid' is invalid" );
        $resourceLoader->register( 'test!invalid', new ResourceLoaderTestModule() );
    }
 
    public function testRegisterInvalidType() {
        $resourceLoader = new EmptyResourceLoader();
        $this->setExpectedException( 'MWException', 'ResourceLoader module info type error' );
        $resourceLoader->register( 'test', new stdClass() );
    }
 
    public function testGetModuleNames() {
        // Use an empty one so that core and extension modules don't get in.
        $resourceLoader = new EmptyResourceLoader();
        $resourceLoader->register( 'test.foo', new ResourceLoaderTestModule() );
        $resourceLoader->register( 'test.bar', new ResourceLoaderTestModule() );
        $this->assertEquals(
            [ 'test.foo', 'test.bar' ],
            $resourceLoader->getModuleNames()
        );
    }
 
    public function provideTestIsFileModule() {
        $fileModuleObj = $this->getMockBuilder( ResourceLoaderFileModule::class )
            ->disableOriginalConstructor()
            ->getMock();
        return [
            'object' => [ false,
                new ResourceLoaderTestModule()
            ],
            'FileModule object' => [ false,
                $fileModuleObj
            ],
            'simple empty' => [ true,
                []
            ],
            'simple scripts' => [ true,
                [ 'scripts' => 'example.js' ]
            ],
            'simple scripts, raw and targets' => [ true, [
                'scripts' => [ 'a.js', 'b.js' ],
                'raw' => true,
                'targets' => [ 'desktop', 'mobile' ],
            ] ],
            'FileModule' => [ true,
                [ 'class' => ResourceLoaderFileModule::class, 'scripts' => 'example.js' ]
            ],
            'TestModule' => [ false,
                [ 'class' => ResourceLoaderTestModule::class, 'scripts' => 'example.js' ]
            ],
            'SkinModule (FileModule subclass)' => [ true,
                [ 'class' => ResourceLoaderSkinModule::class, 'scripts' => 'example.js' ]
            ],
            'JqueryMsgModule (FileModule subclass)' => [ true, [
                'class' => ResourceLoaderJqueryMsgModule::class,
                'scripts' => 'example.js',
            ] ],
            'WikiModule' => [ false, [
                'class' => ResourceLoaderWikiModule::class,
                'scripts' => [ 'MediaWiki:Example.js' ],
            ] ],
        ];
    }
 
    public function testIsFileModule( $expected, $module ) {
        $rl = TestingAccessWrapper::newFromObject( new EmptyResourceLoader() );
        $rl->register( 'test', $module );
        $this->assertSame( $expected, $rl->isFileModule( 'test' ) );
    }
 
    public function testIsFileModuleUnknown() {
        $rl = TestingAccessWrapper::newFromObject( new EmptyResourceLoader() );
        $this->assertSame( false, $rl->isFileModule( 'unknown' ) );
    }
 
    public function testIsModuleRegistered() {
        $rl = new EmptyResourceLoader();
        $rl->register( 'test', new ResourceLoaderTestModule() );
        $this->assertTrue( $rl->isModuleRegistered( 'test' ) );
        $this->assertFalse( $rl->isModuleRegistered( 'test.unknown' ) );
    }
 
    public function testGetModuleUnknown() {
        $rl = new EmptyResourceLoader();
        $this->assertSame( null, $rl->getModule( 'test' ) );
    }
 
    public function testGetModuleClass() {
        $rl = new EmptyResourceLoader();
        $rl->register( 'test', [ 'class' => ResourceLoaderTestModule::class ] );
        $this->assertInstanceOf(
            ResourceLoaderTestModule::class,
            $rl->getModule( 'test' )
        );
    }
 
    public function testGetModuleFactory() {
        $factory = function ( array $info ) {
            $this->assertArrayHasKey( 'kitten', $info );
            return new ResourceLoaderTestModule( $info );
        };
 
        $rl = new EmptyResourceLoader();
        $rl->register( 'test', [ 'factory' => $factory, 'kitten' => 'little ball of fur' ] );
        $this->assertInstanceOf(
            ResourceLoaderTestModule::class,
            $rl->getModule( 'test' )
        );
    }
 
    public function testGetModuleClassDefault() {
        $rl = new EmptyResourceLoader();
        $rl->register( 'test', [] );
        $this->assertInstanceOf(
            ResourceLoaderFileModule::class,
            $rl->getModule( 'test' ),
            'Array-style module registrations default to FileModule'
        );
    }
 
    public function testLessFileCompilation() {
        $context = $this->getResourceLoaderContext();
        $basePath = __DIR__ . '/../../data/less/module';
        $module = new ResourceLoaderFileModule( [
            'localBasePath' => $basePath,
            'styles' => [ 'styles.less' ],
        ] );
        $module->setName( 'test.less' );
        $styles = $module->getStyles( $context );
        $this->assertStringEqualsFile( $basePath . '/styles.css', $styles['all'] );
    }
 
    public static function providePackedModules() {
        return [
            [
                'Example from makePackedModulesString doc comment',
                [ 'foo.bar', 'foo.baz', 'bar.baz', 'bar.quux' ],
                'foo.bar,baz|bar.baz,quux',
            ],
            [
                'Example from expandModuleNames doc comment',
                [ 'jquery.foo', 'jquery.bar', 'jquery.ui.baz', 'jquery.ui.quux' ],
                'jquery.foo,bar|jquery.ui.baz,quux',
            ],
            [
                'Regression fixed in r88706 with dotless names',
                [ 'foo', 'bar', 'baz' ],
                'foo,bar,baz',
            ],
            [
                'Prefixless modules after a prefixed module',
                [ 'single.module', 'foobar', 'foobaz' ],
                'single.module|foobar,foobaz',
            ],
            [
                'Ordering',
                [ 'foo', 'foo.baz', 'baz.quux', 'foo.bar' ],
                'foo|foo.baz,bar|baz.quux',
                [ 'foo', 'foo.baz', 'foo.bar', 'baz.quux' ],
            ]
        ];
    }
 
    public function testMakePackedModulesString( $desc, $modules, $packed ) {
        $this->assertEquals( $packed, ResourceLoader::makePackedModulesString( $modules ), $desc );
    }
 
    public function testExpandModuleNames( $desc, $modules, $packed, $unpacked = null ) {
        $this->assertEquals(
            $unpacked ?: $modules,
            ResourceLoaderContext::expandModuleNames( $packed ),
            $desc
        );
    }
 
    public static function provideAddSource() {
        return [
            [ 'foowiki', 'https://example.org/w/load.php', 'foowiki' ],
            [ 'foowiki', [ 'loadScript' => 'https://example.org/w/load.php' ], 'foowiki' ],
            [
                [
                    'foowiki' => 'https://example.org/w/load.php',
                    'bazwiki' => 'https://example.com/w/load.php',
                ],
                null,
                [ 'foowiki', 'bazwiki' ]
            ]
        ];
    }
 
    public function testAddSource( $name, $info, $expected ) {
        $rl = new ResourceLoader;
        $rl->addSource( $name, $info );
        if ( is_array( $expected ) ) {
            foreach ( $expected as $source ) {
                $this->assertArrayHasKey( $source, $rl->getSources() );
            }
        } else {
            $this->assertArrayHasKey( $expected, $rl->getSources() );
        }
    }
 
    public function testAddSourceDupe() {
        $rl = new ResourceLoader;
        $this->setExpectedException( 'MWException', 'ResourceLoader duplicate source addition error' );
        $rl->addSource( 'foo', 'https://example.org/w/load.php' );
        $rl->addSource( 'foo', 'https://example.com/w/load.php' );
    }
 
    public function testAddSourceInvalid() {
        $rl = new ResourceLoader;
        $this->setExpectedException( 'MWException', 'with no "loadScript" key' );
        $rl->addSource( 'foo',  [ 'x' => 'https://example.org/w/load.php' ] );
    }
 
    public static function provideLoaderImplement() {
        return [
            [ [
                'title' => 'Implement scripts, styles and messages',
 
                'name' => 'test.example',
                'scripts' => 'mw.example();',
                'styles' => [ 'css' => [ '.mw-example {}' ] ],
                'messages' => [ 'example' => '' ],
                'templates' => [],
 
                'expected' => 'mw.loader.implement( "test.example", function ( $, jQuery, require, module ) {
mw.example();
}, {
    "css": [
        ".mw-example {}"
    ]
}, {
    "example": ""
} );',
            ] ],
            [ [
                'title' => 'Implement scripts',
 
                'name' => 'test.example',
                'scripts' => 'mw.example();',
                'styles' => [],
 
                'expected' => 'mw.loader.implement( "test.example", function ( $, jQuery, require, module ) {
mw.example();
} );',
            ] ],
            [ [
                'title' => 'Implement styles',
 
                'name' => 'test.example',
                'scripts' => [],
                'styles' => [ 'css' => [ '.mw-example {}' ] ],
 
                'expected' => 'mw.loader.implement( "test.example", [], {
    "css": [
        ".mw-example {}"
    ]
} );',
            ] ],
            [ [
                'title' => 'Implement scripts and messages',
 
                'name' => 'test.example',
                'scripts' => 'mw.example();',
                'messages' => [ 'example' => '' ],
 
                'expected' => 'mw.loader.implement( "test.example", function ( $, jQuery, require, module ) {
mw.example();
}, {}, {
    "example": ""
} );',
            ] ],
            [ [
                'title' => 'Implement scripts and templates',
 
                'name' => 'test.example',
                'scripts' => 'mw.example();',
                'templates' => [ 'example.html' => '' ],
 
                'expected' => 'mw.loader.implement( "test.example", function ( $, jQuery, require, module ) {
mw.example();
}, {}, {}, {
    "example.html": ""
} );',
            ] ],
            [ [
                'title' => 'Implement unwrapped user script',
 
                'name' => 'user',
                'scripts' => 'mw.example( 1 );',
                'wrap' => false,
 
                'expected' => 'mw.loader.implement( "user", "mw.example( 1 );" );',
            ] ],
        ];
    }
 
    public function testMakeLoaderImplementScript( $case ) {
        $case += [
            'wrap' => true,
            'styles' => [], 'templates' => [], 'messages' => new XmlJsCode( '{}' )
        ];
        ResourceLoader::clearCache();
        $this->setMwGlobals( 'wgResourceLoaderDebug', true );
 
        $rl = TestingAccessWrapper::newFromClass( 'ResourceLoader' );
        $this->assertEquals(
            $case['expected'],
            $rl->makeLoaderImplementScript(
                $case['name'],
                ( $case['wrap'] && is_string( $case['scripts'] ) )
                    ? new XmlJsCode( $case['scripts'] )
                    : $case['scripts'],
                $case['styles'],
                $case['messages'],
                $case['templates']
            )
        );
    }
 
    public function testMakeLoaderImplementScriptInvalid() {
        $this->setExpectedException( 'MWException', 'Invalid scripts error' );
        $rl = TestingAccessWrapper::newFromClass( 'ResourceLoader' );
        $rl->makeLoaderImplementScript(
            'test', // name
            123, // scripts
            null, // styles
            null, // messages
            null // templates
        );
    }
 
    public function testMakeLoaderRegisterScript() {
        $this->assertEquals(
            'mw.loader.register( [
    [
        "test.name",
        "1234567"
    ]
] );',
            ResourceLoader::makeLoaderRegisterScript( [
                [ 'test.name', '1234567' ],
            ] ),
            'Nested array parameter'
        );
 
        $this->assertEquals(
            'mw.loader.register( "test.name", "1234567" );',
            ResourceLoader::makeLoaderRegisterScript(
                'test.name',
                '1234567'
            ),
            'Variadic parameters'
        );
    }
 
    public function testMakeLoaderSourcesScript() {
        $this->assertEquals(
            'mw.loader.addSource( "local", "/w/load.php" );',
            ResourceLoader::makeLoaderSourcesScript( 'local', '/w/load.php' )
        );
        $this->assertEquals(
            'mw.loader.addSource( {
    "local": "/w/load.php"
} );',
            ResourceLoader::makeLoaderSourcesScript( [ 'local' => '/w/load.php' ] )
        );
        $this->assertEquals(
            'mw.loader.addSource( {
    "local": "/w/load.php",
    "example": "https://example.org/w/load.php"
} );',
            ResourceLoader::makeLoaderSourcesScript( [
                'local' => '/w/load.php',
                'example' => 'https://example.org/w/load.php'
            ] )
        );
        $this->assertEquals(
            'mw.loader.addSource( [] );',
            ResourceLoader::makeLoaderSourcesScript( [] )
        );
    }
 
    private static function fakeSources() {
        return [
            'examplewiki' => [
                'loadScript' => '//example.org/w/load.php',
                'apiScript' => '//example.org/w/api.php',
            ],
            'example2wiki' => [
                'loadScript' => '//example.com/w/load.php',
                'apiScript' => '//example.com/w/api.php',
            ],
        ];
    }
 
    public function testGetLoadScript() {
        $this->setMwGlobals( 'wgResourceLoaderSources', [] );
        $rl = new ResourceLoader();
        $sources = self::fakeSources();
        $rl->addSource( $sources );
        foreach ( [ 'examplewiki', 'example2wiki' ] as $name ) {
            $this->assertEquals( $rl->getLoadScript( $name ), $sources[$name]['loadScript'] );
        }
 
        try {
            $rl->getLoadScript( 'thiswasneverreigstered' );
            $this->assertTrue( false, 'ResourceLoader::getLoadScript should have thrown an exception' );
        } catch ( MWException $e ) {
            $this->assertTrue( true );
        }
    }
 
    protected function getFailFerryMock() {
        $mock = $this->getMockBuilder( ResourceLoaderTestModule::class )
            ->setMethods( [ 'getScript' ] )
            ->getMock();
        $mock->method( 'getScript' )->will( $this->throwException(
            new Exception( 'Ferry not found' )
        ) );
        return $mock;
    }
 
    protected function getSimpleModuleMock( $script = '' ) {
        $mock = $this->getMockBuilder( ResourceLoaderTestModule::class )
            ->setMethods( [ 'getScript' ] )
            ->getMock();
        $mock->method( 'getScript' )->willReturn( $script );
        return $mock;
    }
 
    public function testGetCombinedVersion() {
        $rl = $this->getMockBuilder( EmptyResourceLoader::class )
            // Disable log from outputErrorAndLog
            ->setMethods( [ 'outputErrorAndLog' ] )->getMock();
        $rl->register( [
            'foo' => self::getSimpleModuleMock(),
            'ferry' => self::getFailFerryMock(),
            'bar' => self::getSimpleModuleMock(),
        ] );
        $context = $this->getResourceLoaderContext( [], $rl );
 
        $this->assertEquals(
            '',
            $rl->getCombinedVersion( $context, [] ),
            'empty list'
        );
 
        $this->assertEquals(
            ResourceLoader::makeHash( self::BLANK_VERSION ),
            $rl->getCombinedVersion( $context, [ 'foo' ] ),
            'compute foo'
        );
 
        // Verify that getCombinedVersion() does not throw when ferry fails.
        // Instead it gracefully continues to combine the remaining modules.
        $this->assertEquals(
            ResourceLoader::makeHash( self::BLANK_VERSION . self::BLANK_VERSION ),
            $rl->getCombinedVersion( $context, [ 'foo', 'ferry', 'bar' ] ),
            'compute foo+ferry+bar (T152266)'
        );
    }
 
    public static function provideMakeModuleResponseConcat() {
        $testcases = [
            [
                'modules' => [
                    'foo' => 'foo()',
                ],
                'expected' => "foo()\n" . 'mw.loader.state( {
    "foo": "ready"
} );',
                'minified' => "foo()\n" . 'mw.loader.state({"foo":"ready"});',
                'message' => 'Script without semi-colon',
            ],
            [
                'modules' => [
                    'foo' => 'foo()',
                    'bar' => 'bar()',
                ],
                'expected' => "foo()\nbar()\n" . 'mw.loader.state( {
    "foo": "ready",
    "bar": "ready"
} );',
                'minified' => "foo()\nbar()\n" . 'mw.loader.state({"foo":"ready","bar":"ready"});',
                'message' => 'Two scripts without semi-colon',
            ],
            [
                'modules' => [
                    'foo' => "foo()\n// bar();"
                ],
                'expected' => "foo()\n// bar();\n" . 'mw.loader.state( {
    "foo": "ready"
} );',
                'minified' => "foo()\n" . 'mw.loader.state({"foo":"ready"});',
                'message' => 'Script with semi-colon in comment (T162719)',
            ],
        ];
        $ret = [];
        foreach ( $testcases as $i => $case ) {
            $ret["#$i"] = [
                $case['modules'],
                $case['expected'],
                true, // debug
                $case['message'],
            ];
            $ret["#$i (minified)"] = [
                $case['modules'],
                $case['minified'],
                false, // debug
                $case['message'],
            ];
        }
        return $ret;
    }
 
    public function testMakeModuleResponseConcat( $scripts, $expected, $debug, $message = null ) {
        $rl = new EmptyResourceLoader();
        $modules = array_map( function ( $script ) {
            return self::getSimpleModuleMock( $script );
        }, $scripts );
        $rl->register( $modules );
 
        $this->setMwGlobals( 'wgResourceLoaderDebug', $debug );
        $context = $this->getResourceLoaderContext(
            [
                'modules' => implode( '|', array_keys( $modules ) ),
                'only' => 'scripts',
            ],
            $rl
        );
 
        $response = $rl->makeModuleResponse( $context, $modules );
        $this->assertSame( [], $rl->getErrors(), 'Errors' );
        $this->assertEquals( $expected, $response, $message ?: 'Response' );
    }
 
    public function testMakeModuleResponseError() {
        $modules = [
            'foo' => self::getSimpleModuleMock( 'foo();' ),
            'ferry' => self::getFailFerryMock(),
            'bar' => self::getSimpleModuleMock( 'bar();' ),
        ];
        $rl = new EmptyResourceLoader();
        $rl->register( $modules );
        $context = $this->getResourceLoaderContext(
            [
                'modules' => 'foo|ferry|bar',
                'only' => 'scripts',
            ],
            $rl
        );
 
        // Disable log from makeModuleResponse via outputErrorAndLog
        $this->setLogger( 'exception', new Psr\Log\NullLogger() );
 
        $response = $rl->makeModuleResponse( $context, $modules );
        $errors = $rl->getErrors();
 
        $this->assertCount( 1, $errors );
        $this->assertRegExp( '/Ferry not found/', $errors[0] );
        $this->assertEquals(
            "foo();\nbar();\n" . 'mw.loader.state( {
    "ferry": "error",
    "foo": "ready",
    "bar": "ready"
} );',
            $response
        );
    }
 
    public function testMakeModuleResponseStartupError() {
        $rl = new EmptyResourceLoader();
        $rl->register( [
            'foo' => self::getSimpleModuleMock( 'foo();' ),
            'ferry' => self::getFailFerryMock(),
            'bar' => self::getSimpleModuleMock( 'bar();' ),
            'startup' => [ 'class' => 'ResourceLoaderStartUpModule' ],
        ] );
        $context = $this->getResourceLoaderContext(
            [
                'modules' => 'startup',
                'only' => 'scripts',
            ],
            $rl
        );
 
        $this->assertEquals(
            [ 'foo', 'ferry', 'bar', 'startup' ],
            $rl->getModuleNames(),
            'getModuleNames'
        );
 
        // Disable log from makeModuleResponse via outputErrorAndLog
        $this->setLogger( 'exception', new Psr\Log\NullLogger() );
 
        $modules = [ 'startup' => $rl->getModule( 'startup' ) ];
        $response = $rl->makeModuleResponse( $context, $modules );
        $errors = $rl->getErrors();
 
        $this->assertRegExp( '/Ferry not found/', $errors[0] );
        $this->assertCount( 1, $errors );
        $this->assertRegExp(
            '/isCompatible.*function startUp/s',
            $response,
            'startup response undisrupted (T152266)'
        );
        $this->assertRegExp(
            '/register\([^)]+"ferry",\s*""/s',
            $response,
            'startup response registers broken module'
        );
        $this->assertRegExp(
            '/state\([^)]+"ferry":\s*"error"/s',
            $response,
            'startup response sets state to error'
        );
    }
 
    public function testMakeModuleResponseExtraHeaders() {
        $module = $this->getMockBuilder( ResourceLoaderTestModule::class )
            ->setMethods( [ 'getPreloadLinks' ] )->getMock();
        $module->method( 'getPreloadLinks' )->willReturn( [
             'https://example.org/script.js' => [ 'as' => 'script' ],
        ] );
 
        $rl = new EmptyResourceLoader();
        $rl->register( [
            'foo' => $module,
        ] );
        $context = $this->getResourceLoaderContext(
            [ 'modules' => 'foo', 'only' => 'scripts' ],
            $rl
        );
 
        $modules = [ 'foo' => $rl->getModule( 'foo' ) ];
        $response = $rl->makeModuleResponse( $context, $modules );
        $extraHeaders = TestingAccessWrapper::newFromObject( $rl )->extraHeaders;
 
        $this->assertEquals(
            [
                'Link: <https://example.org/script.js>;rel=preload;as=script'
            ],
            $extraHeaders,
            'Extra headers'
        );
    }
 
    public function testMakeModuleResponseExtraHeadersMulti() {
        $foo = $this->getMockBuilder( ResourceLoaderTestModule::class )
            ->setMethods( [ 'getPreloadLinks' ] )->getMock();
        $foo->method( 'getPreloadLinks' )->willReturn( [
             'https://example.org/script.js' => [ 'as' => 'script' ],
        ] );
 
        $bar = $this->getMockBuilder( ResourceLoaderTestModule::class )
            ->setMethods( [ 'getPreloadLinks' ] )->getMock();
        $bar->method( 'getPreloadLinks' )->willReturn( [
             '/example.png' => [ 'as' => 'image' ],
             '/example.jpg' => [ 'as' => 'image' ],
        ] );
 
        $rl = new EmptyResourceLoader();
        $rl->register( [ 'foo' => $foo, 'bar' => $bar ] );
        $context = $this->getResourceLoaderContext(
            [ 'modules' => 'foo|bar', 'only' => 'scripts' ],
            $rl
        );
 
        $modules = [ 'foo' => $rl->getModule( 'foo' ), 'bar' => $rl->getModule( 'bar' ) ];
        $response = $rl->makeModuleResponse( $context, $modules );
        $extraHeaders = TestingAccessWrapper::newFromObject( $rl )->extraHeaders;
        $this->assertEquals(
            [
                'Link: <https://example.org/script.js>;rel=preload;as=script',
                'Link: </example.png>;rel=preload;as=image,</example.jpg>;rel=preload;as=image'
            ],
            $extraHeaders,
            'Extra headers'
        );
    }
}