I am using the following tools for my site:

1. Windows + WSL (Windows Subsystem for Linux)
2. Node.js is installed through WSL
3. My app is running through WSL
4. I'm using Local by Flywheel installed on Windows

With this setup, I spent an agonizing amount of time trying to figure out why I was getting a "fetch failed" error. To get around it, I had to do the following:

1. in your WSL terminal: cat /etc/resolv.conf
2. The IP address associated with the "nameserver" in the response is your IP. Keep this for later.
3. In Local, click the main menu button >> preferences >> Advanced >> set "Router Mode" to "localhost".
4. Note the port for your site beside "site host"
5. Set your WORDPRESS_URL in your .env file to the IP address you received with the port set on the Localhost in Local.

Given these settings:

cat /etc/resolv.conf
# This file was automatically generated by WSL. To stop automatic generation of this file, add the following entry to /etc/wsl.conf:
# [network]
# generateResolvConf = false
nameserver 172.17.48.1

After changing this:

I see this:

And my resulting configuration is this:

# Your WordPress URL.
WORDPRESS_URL="http://172.17.48.1:10005"