🔨 tweak route handling

functions/grapher/[slug].ts

@@ -7,7 +7,7 @@ import {
 import { IRequestStrict, Router, error, cors } from "itty-router"
 
 const { preflight, corsify } = cors({
-    allowMethods: "GET",
+    allowMethods: ["GET", "OPTIONS", "HEAD"],
 })
 
 const router = Router<IRequestStrict, [URL, Env, string]>({
@@ -27,7 +27,7 @@ router
     )
     .all("*", () => error(404, "Route not defined"))
 
-export const onRequestGet: PagesFunction = async (context) => {
+export const onRequest: PagesFunction = async (context) => {
     // Makes it so that if there's an error, we will just deliver the original page before the HTML rewrite.
     // Only caveat is that redirects will not be taken into account for some reason; but on the other hand the worker is so simple that it's unlikely to fail.
     context.passThroughOnException()