From 816d62b2ef72d16d6d72964c0b63bc086e2509cd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johan=20Bergstro=CC=88m?= <bugs@bergstroem.nu>
Date: Mon, 21 Mar 2022 12:43:10 -0300
Subject: [PATCH] feat: return a 500 request if the proxy errors

Instead of silently dropping the request, pass a 500 to the proxy consumer.
---
 packages/vite/src/node/server/middlewares/proxy.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/packages/vite/src/node/server/middlewares/proxy.ts b/packages/vite/src/node/server/middlewares/proxy.ts
index aa1100f13d5229..8e374cd8ef92a6 100644
--- a/packages/vite/src/node/server/middlewares/proxy.ts
+++ b/packages/vite/src/node/server/middlewares/proxy.ts
@@ -44,11 +44,16 @@ export function proxyMiddleware(
     }
     const proxy = httpProxy.createProxyServer(opts) as HttpProxy.Server
 
-    proxy.on('error', (err) => {
+    proxy.on('error', (err, req, res) => {
       config.logger.error(`${colors.red(`http proxy error:`)}\n${err.stack}`, {
         timestamp: true,
         error: err
       })
+      res
+        .writeHead(500, {
+          'Content-Type': 'text/plain'
+        })
+        .end()
     })
 
     if (opts.configure) {