From 86058e710790e453d139d5cb03e38c7f62de1dbf Mon Sep 17 00:00:00 2001
From: Max Wittal <max.wittal@mwittal.de>
Date: Sun, 5 Apr 2020 21:19:58 +0200
Subject: [PATCH] SSL_shutdown() only if not already closed by remote

---
 httplib.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/httplib.h b/httplib.h
index dffc58a3a6..ed48c9a21f 100644
--- a/httplib.h
+++ b/httplib.h
@@ -4397,7 +4397,9 @@ inline bool process_and_close_socket_ssl(
     }
   }
 
-  SSL_shutdown(ssl);
+  if (ret) {
+    SSL_shutdown(ssl);		// shutdown only if not already closed by remote
+  }
   {
     std::lock_guard<std::mutex> guard(ctx_mutex);
     SSL_free(ssl);