From f39a2aafd35a70effc298d53b0b7539fbac79e89 Mon Sep 17 00:00:00 2001
From: Timo Zander <timo---zander@live.de>
Date: Wed, 13 Jan 2021 17:15:20 +0100
Subject: [PATCH] feat(vite): support RegExp strings as server.proxy keys
 (#1510)

---
 docs/config/index.md                               | 10 +++++++++-
 packages/vite/src/node/server/middlewares/proxy.ts |  5 ++++-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/docs/config/index.md b/docs/config/index.md
index 9ed1d9d6de9136..2ae7362aa705fb 100644
--- a/docs/config/index.md
+++ b/docs/config/index.md
@@ -239,7 +239,9 @@ export default ({ command, mode }) => {
 
 - **Type:** `Record<string, string | ProxyOptions>`
 
-  Configure custom proxy rules for the dev server. Expects an object of `{ key: options }` pairs. Uses [`http-proxy`](https://github.com/http-party/node-http-proxy). Full options [here](https://github.com/http-party/node-http-proxy#options).
+  Configure custom proxy rules for the dev server. Expects an object of `{ key: options }` pairs. If the key starts with `^`, it will be interpreted as a `RegExp`.
+
+  Uses [`http-proxy`](https://github.com/http-party/node-http-proxy). Full options [here](https://github.com/http-party/node-http-proxy#options).
 
   **Example:**
 
@@ -255,6 +257,12 @@ export default ({ command, mode }) => {
           changeOrigin: true,
           rewrite: (path) => path.replace(/^\/api/, '')
         }
+        // with RegEx
+        '^/fallback/.*': {
+          target: 'http://jsonplaceholder.typicode.com',
+          changeOrigin: true,
+          rewrite: (path) => path.replace(/^\/fallback/, '')
+        }
       }
     }
   }
diff --git a/packages/vite/src/node/server/middlewares/proxy.ts b/packages/vite/src/node/server/middlewares/proxy.ts
index 51dbb956b5e7fd..59750b35f84eed 100644
--- a/packages/vite/src/node/server/middlewares/proxy.ts
+++ b/packages/vite/src/node/server/middlewares/proxy.ts
@@ -78,7 +78,10 @@ export function proxyMiddleware({
   return (req, res, next) => {
     const url = req.url!
     for (const context in proxies) {
-      if (url.startsWith(context)) {
+      if (
+        (context.startsWith('^') && new RegExp(context).test(url)) ||
+        url.startsWith(context)
+      ) {
         const [proxy, opts] = proxies[context]
 
         if (opts.bypass) {