In my most recent personal project, I used the Vue framework and Vue Router to handle the routing. I host the site on Apache and it uses the mod_rewrite module to rewrite URLs. The only rewrite rules I initially had were to redirect all requests to HTTPS and to prevent hot-linking of any images.

Within the application, links to different pages were correctly handled by Vue Router. However, if I were to use the links directly in the address bar, I would get a 404 error. This is because Apache, and not Vue Router, was attempting to handle the URL.

To fix this, I had to update my rewrite rules to redirect certain requests to the index page so that Vue Router could handle the URLs. I added the following rules to my .htaccess file:

<IfModule mod_rewrite.c>
    RewriteEngine On   # enable the rewrite engine
    RewriteBase /      # set the base URL for relative paths
    # Other rules go in here ...
    RewriteRule ^index\.html$ - [L]      # don't rewrite index.html
    RewriteCond %{REQUEST_FILENAME} !-f  # if file doesn't exist
    RewriteCond %{REQUEST_FILENAME} !-d  # or if directory doesn't exist
    RewriteRule . index.html [L]         # serve index.html

This was a simple fix and now the URLs to separate pages in the application do not return 404 errors when entered directly in the address bar.