<https://larryullman.com/forums/index.php?/topic/29-part-3-physical-products-ch8-creating-a-catalog/#comment-54>
<http://schema.org/text>
"First, thanks for posting all the key information. Much appreciated. The cause of the problem is the directory structure. You say that the images and products folders are in the root directory, but are they really? Or are they in the physical_products directory (per your URL)? If it's the latter, then you need to change references in the header from /something to /physical_products/something. You'll also need to set a RewriteBase in the .htaccess file, just after turning the RewriteEngine on: \nRewriteBase /physical_products/ \n"
<https://larryullman.com/forums/index.php?/topic/29-part-3-physical-products-ch8-creating-a-catalog/#comment-308>