From e244b63f872c3321fe9fbde325a1718dababef6d Mon Sep 17 00:00:00 2001
From: Sarper AVCI <50243344+sarperavci@users.noreply.github.com>
Date: Wed, 5 Nov 2025 22:53:51 +0300
Subject: [PATCH] Fix Content-Type header update for non-empty data in
 set_curl_options

---
 curl_cffi/requests/utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/curl_cffi/requests/utils.py b/curl_cffi/requests/utils.py
index 67bcd3ad..5055bbdc 100644
--- a/curl_cffi/requests/utils.py
+++ b/curl_cffi/requests/utils.py
@@ -455,7 +455,7 @@ def set_curl_options(
         update_header_line(
             header_lines, "Content-Type", "application/x-www-form-urlencoded"
         )
-    if isinstance(data, (str, bytes)):
+    if isinstance(data, (str, bytes)) and data:
         update_header_line(header_lines, "Content-Type", "application/octet-stream")
 
     # Never send `Expect` header.