From beb41a10811c82a29ef95634f23cf5a0c2c5b9aa Mon Sep 17 00:00:00 2001
From: New Bing <iflamed@gmail.com>
Date: Mon, 7 Oct 2024 23:49:08 +0800
Subject: [PATCH 1/2] Add reverse proxy example

---
 examples/proxy.md | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/examples/proxy.md b/examples/proxy.md
index dc5537ea..7655fbb6 100644
--- a/examples/proxy.md
+++ b/examples/proxy.md
@@ -34,3 +34,21 @@ app.get('/', async (_c) => {
 
 The headers of `Response` returned by `fetch` are immutable. So, an error will occur if you modify it.
 :::
+
+## Simple Reverse Proxy
+
+```ts
+import { Hono } from 'hono'
+
+const app = new Hono()
+
+app.all('*', async (c) => {
+  // replace the origin `https://example.com` to the real origin
+  const res = await fetch('https://example.com', c.req.raw)
+  // clone the response to return a response with modifiable headers
+  const newResponse = new Response(res.body, res)
+  return newResponse
+})
+
+export default app
+```

From 4a2a3d1d7cf3a3cd7df7e85d74dd40633249739e Mon Sep 17 00:00:00 2001
From: New Bing <iflamed@gmail.com>
Date: Tue, 8 Oct 2024 20:37:22 +0800
Subject: [PATCH 2/2] fix http redirection of reverse proxy

---
 examples/proxy.md | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/examples/proxy.md b/examples/proxy.md
index 7655fbb6..ff51f25b 100644
--- a/examples/proxy.md
+++ b/examples/proxy.md
@@ -43,11 +43,26 @@ import { Hono } from 'hono'
 const app = new Hono()
 
 app.all('*', async (c) => {
-  // replace the origin `https://example.com` to the real origin
-  const res = await fetch('https://example.com', c.req.raw)
-  // clone the response to return a response with modifiable headers
-  const newResponse = new Response(res.body, res)
-  return newResponse
+  // replace the origin `https://example.com` to your real upstream
+  const api = new URL('https://www.example.com')
+  const url = new URL(c.req.url)
+  url.protocol = api.protocol
+  url.host = api.host
+  url.port = api.port
+  const upstream = url.toString()
+  return await fetch(upstream, {
+    method: c.req.raw.method,
+    body: c.req.raw.body,
+    credentials: c.req.raw.credentials,
+    cache: c.req.raw.cache,
+    headers: c.req.raw.headers,
+    referrer: c.req.raw.referrer,
+    referrerPolicy: c.req.raw.referrerPolicy,
+    integrity: c.req.raw.integrity,
+    keepalive: false,
+    mode: c.req.raw.mode,
+    redirect: 'manual'
+  })
 })
 
 export default app