Right now, when hosting a static website on Render, the file page1/index.html is available both at /page1 and at /page1/. However, if the page contains any relative links, it is impossible for both URLs to reference these links correctly. Most web servers handle this by redirecting /page1 to /page1/. Netlify does this as well. Vercel works the same way as Render in its default mode, but it also allows one to configure trailing slash behavior (always or never) in configuration.