Adjust xForwardedHeaders middleware to always use x-forwarded-for (#5311)

Author: OliverJAsh

.changeset/ten-singers-rest.md

@@ -0,0 +1,5 @@
+---
+"@effect/platform": patch
+---
+
+Adjust `xForwardedHeaders` middleware to always use `x-forwarded-for`

packages/platform/src/internal/httpMiddleware.ts

@@ -187,17 +187,14 @@ export const tracer = make((httpApp) =>
 
 /** @internal */
 export const xForwardedHeaders = make((httpApp) =>
-  Effect.updateService(httpApp, ServerRequest.HttpServerRequest, (request) =>
-    request.headers["x-forwarded-host"]
-      ? request.modify({
-        headers: Headers.set(
-          request.headers,
-          "host",
-          request.headers["x-forwarded-host"]
-        ),
-        remoteAddress: request.headers["x-forwarded-for"]?.split(",")[0].trim()
-      })
-      : request)
+  Effect.updateService(httpApp, ServerRequest.HttpServerRequest, (request) => {
+    const host = request.headers["x-forwarded-host"]
+    const remoteAddress = request.headers["x-forwarded-for"]?.split(",")[0].trim()
+    return request.modify({
+      headers: host !== undefined ? Headers.set(request.headers, "host", host) : undefined,
+      remoteAddress
+    })
+  })
 )
 
 /** @internal */