Installing WordPress with localhost as absoluteURL fails with getaddrinfo ENOTFOUND localhost

[adamziel]

Description

This code:

    const php = await PHP.load('7.4', {
        requestHandler: {
            documentRoot: '/wordpress',
            absoluteUrl: `http://localhost:1235/`,
        }
    })
    await php.request({
        url: '/wp-admin/install.php?step=2',
        method: 'POST',
        formData: {
            language: 'en',
            prefix: 'wp_',
            weblog_title: 'My WordPress Website',
            user_name: 'admin',
            admin_password: 'password',
            admin_password2: 'password',
            Submit: 'Install WordPress',
            pw_weak: '1',
            admin_email: '[email protected]'
        }
    });

Results in the following error:

Error: getaddrinfo ENOTFOUND localhost
at GetAddrInfoReqWrap.on lookup [as oncomplete] (node:dns: 107:26) {
errno: -3008,
code: 'ENOTFOUND*
syscall: 'getaddrinfo'
hostname: "Localhost'
}

Workaround

Use 127.0.0.1 instead of localhost

Why does it happen?

I'm not sure! My guess is it tries to resolve localhost using DNS resolution and is unaware of /etc/hosts. I think there's an emscripten function that handles getaddrinfo – there should be a way to hook into that and provide a custom resolution mechanism.

[adamziel]

This one needs testing – there is a chance this now works after a localhost resolution mechanism was added:

wordpress-playground/packages/php-wasm/compile/build-assets/esm-suffix.js

Lines 1 to 5 in 413d07f

	/**
	* Emscripten resolves `localhost` to a random IP address. Let's
	* make it always resolve to 127.0.0.1.
	*/
	DNS.address_map.addrs.localhost = '127.0.0.1';