From 8c803b503c13c383577c829bf9c2007483142039 Mon Sep 17 00:00:00 2001
From: WeidiDeng <weidi_deng@icloud.com>
Date: Thu, 17 Oct 2024 16:22:17 +0800
Subject: [PATCH] check if body is less than anticipated when there is no error
 reported

---
 modules/caddyhttp/reverseproxy/fastcgi/client.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/modules/caddyhttp/reverseproxy/fastcgi/client.go b/modules/caddyhttp/reverseproxy/fastcgi/client.go
index 18c9d0ba..b654bc84 100644
--- a/modules/caddyhttp/reverseproxy/fastcgi/client.go
+++ b/modules/caddyhttp/reverseproxy/fastcgi/client.go
@@ -157,13 +157,13 @@ func (c *client) Do(p map[string]string, req io.Reader) (r io.Reader, err error)
 	writer.recType = Stdin
 	if req != nil {
 		_, err = io.Copy(writer, req)
+		if err != nil {
+			return nil, err
+		}
 		// body length mismatch
 		if lr, ok := req.(*io.LimitedReader); ok && lr.N > 0 {
 			return nil, io.ErrUnexpectedEOF
 		}
-		if err != nil {
-			return nil, err
-		}
 	}
 	err = writer.FlushStream()
 	if err != nil {