diff --git a/src/server/proxy.ts b/src/server/proxy.ts
index 0258496..ed1ff23 100644
--- a/src/server/proxy.ts
+++ b/src/server/proxy.ts
@@ -38,12 +38,20 @@ export async function proxySubdomain(subdomain: string, req: Request): Promise<R
 
   const url = new URL(req.url)
   const target = `http://localhost:${app.port}${url.pathname}${url.search}`
+  const hasBody = req.method !== 'GET' && req.method !== 'HEAD'
+  const body = hasBody ? await req.arrayBuffer() : undefined
+
+  const headers = new Headers(req.headers)
+  headers.delete('host')
+  headers.delete('connection')
+  headers.delete('keep-alive')
+  headers.delete('transfer-encoding')
 
   try {
     return await fetch(target, {
       method: req.method,
-      headers: req.headers,
-      body: req.method !== 'GET' && req.method !== 'HEAD' ? req.body : undefined,
+      headers,
+      body,
     })
   } catch (e) {
     console.error(`Proxy error for ${subdomain}:`, e)