http2 is failing with

[punkpeye]

capturing exception: could not handle request (058f571aa3784fe995c9e28941c65312) TypeError: Headers.append: ":method" is an invalid header name.
    at webidl.errors.exception (/Users/punkpeye/Developer/punkpeye/glama/node_modules/.pnpm/[email protected]/node_modules/undici/lib/web/fetch/webidl.js:13:10)
    at webidl.errors.invalidArgument (/Users/punkpeye/Developer/punkpeye/glama/node_modules/.pnpm/[email protected]/node_modules/undici/lib/web/fetch/webidl.js:29:24)
    at appendHeader (/Users/punkpeye/Developer/punkpeye/glama/node_modules/.pnpm/[email protected]/node_modules/undici/lib/web/fetch/headers.js:89:25)
    at Headers.append (/Users/punkpeye/Developer/punkpeye/glama/node_modules/.pnpm/[email protected]/node_modules/undici/lib/web/fetch/headers.js:390:12)

If I enable http2 in fastify, then the requests fail with the above error.

[punkpeye]

Not sure if this is the solution, but refactoring createRemixHeaders helped.

(
  fastifyHeaders: FastifyRequest['headers'],
): Headers => {
  const headers = new Headers();

  for (const [key, value] of Object.entries(fastifyHeaders)) {
    if (key.startsWith(':')) {
      if (key === ':authority' && typeof value === 'string') {
        headers.set('host', value);
      }

      continue;
    }

    if (Array.isArray(value)) {
      for (const member of value) headers.append(key, member);
    } else if (value) {
      headers.append(key, value);
    }
  }

  return headers;
};

[mcansh]

wait jk, i got it by removing installGlobals

old

what does your server look like? im not able to reproduce using the following

import fs from "node:fs";
import process from "node:process";
import chalk from "chalk";
import { remixFastify } from "@mcansh/remix-fastify";
import { installGlobals } from "@remix-run/node";
import { fastify } from "fastify";
import sourceMapSupport from "source-map-support";
import getPort, { portNumbers } from "get-port";

installGlobals();
sourceMapSupport.install();

const app = fastify({
  http2: true,
  https: {
    key: fs.readFileSync("server-key.pem"),
    cert: fs.readFileSync("server-cert.pem"),
  },
});

await app.register(remixFastify);

const host = process.env.HOST === "true" ? "0.0.0.0" : "127.0.0.1";
const desiredPort = Number(process.env.PORT) || 3000;
const portToUse = await getPort({
  port: portNumbers(desiredPort, desiredPort + 100),
});

let address = await app.listen({ port: portToUse, host });

if (portToUse !== desiredPort) {
  console.warn(
    chalk.yellow(
      `⚠️  Port ${desiredPort} is not available, using ${portToUse} instead.`,
    ),
  );
}

console.log(chalk.green(`✅ app ready: ${address}`));