Initial setup from simple-proxy

src/utils/headers.ts

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+import { H3Event } from 'h3';
+
+const blacklistedHeaders = [
+  'cf-connecting-ip',
+  'cf-worker',
+  'cf-ray',
+  'cf-visitor',
+  'cf-ew-via',
+  'x-forwarded-for',
+  'x-forwarded-host',
+  'x-forwarded-proto',
+  'forwarded',
+  'x-real-ip',
+];
+
+function copyHeader(
+  headers: Headers,
+  outputHeaders: Headers,
+  inputKey: string,
+  outputKey: string,
+) {
+  if (headers.has(inputKey))
+    outputHeaders.set(outputKey, headers.get(inputKey) ?? '');
+}
+
+export function getProxyHeaders(headers: Headers): Headers {
+  const output = new Headers();
+
+  const headerMap: Record<string, string> = {
+    'X-Cookie': 'Cookie',
+    'X-Referer': 'Referer',
+    'X-Origin': 'Origin',
+  };
+  Object.entries(headerMap).forEach((entry) => {
+    copyHeader(headers, output, entry[0], entry[1]);
+  });
+
+  output.set(
+    'User-Agent',
+    'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0',
+  );
+
+  return output;
+}
+
+export function getAfterResponseHeaders(
+  headers: Headers,
+  finalUrl: string,
+): Record<string, string> {
+  const output: Record<string, string> = {};
+
+  if (headers.has('Set-Cookie'))
+    output['X-Set-Cookie'] = headers.get('Set-Cookie') ?? '';
+
+  return {
+    'Access-Control-Allow-Origin': '*',
+    'Access-Control-Expose-Headers': '*',
+    Vary: 'Origin',
+    'X-Final-Destination': finalUrl,
+  };
+}
+
+export function removeHeadersFromEvent(event: H3Event, key: string) {
+  const normalizedKey = key.toLowerCase();
+  if (event.node.req.headers[normalizedKey])
+    delete event.node.req.headers[normalizedKey];
+}
+
+export function cleanupHeadersBeforeProxy(event: H3Event) {
+  blacklistedHeaders.forEach((key) => {
+    removeHeadersFromEvent(event, key);
+  });
+}