🔨 incorporate pr feedback

functions/_common/grapherRenderer.ts

@@ -218,7 +218,7 @@ export async function fetchGrapherConfig(
     const fetchResponse = await fetchUnparsedGrapherConfig(slug, env, etag)
 
     if (fetchResponse.status === 404) {
-        // we throw 404 errors instad of returning a 404 response so that the router
+        // we throw 404 errors instead of returning a 404 response so that the router
         // catch handler can do a lookup in the redirects file and maybe send
         // a 302 redirect response
         throw new StatusError(404)

functions/grapher/[slug].ts

@@ -51,6 +51,7 @@ export const onRequest: PagesFunction = async (context) => {
             // so that the common, happy path does not have to fetch the redirects file.
             if (e instanceof StatusError && e.status === 404) {
                 console.log("Handling 404 for ", url.pathname)
+
                 const fullslug = url.pathname.split("/").pop() as string
 
                 const allExtensions = Object.values(extensions)
@@ -64,6 +65,12 @@ export const onRequest: PagesFunction = async (context) => {
                 const slug = matchResult?.groups?.slug ?? fullslug
                 const extension = matchResult?.groups?.extension ?? ""
 
+                if (slug.toLowerCase() !== slug)
+                    return createRedirectResponse(
+                        `${slug.toLowerCase()}${extension}`,
+                        url
+                    )
+
                 console.log("Looking up slug and extension", {
                     slug,
                     extension,