From 9f1239c56ea8f0e284dea84fc1a66df2582288b8 Mon Sep 17 00:00:00 2001
From: Delyan Angelov <delian66@gmail.com>
Date: Sat, 17 Dec 2022 19:08:59 +0200
Subject: [PATCH] vweb,net: fix vweb crash when the connection was closed
 prematurely (tested with Chrome on windows, refreshing as fast as possible)

---
 vlib/net/tcp.v   | 3 +++
 vlib/vweb/vweb.v | 8 +++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/vlib/net/tcp.v b/vlib/net/tcp.v
index 0bc97f1961..788fc87f1e 100644
--- a/vlib/net/tcp.v
+++ b/vlib/net/tcp.v
@@ -151,6 +151,9 @@ pub fn (mut c TcpConn) read_deadline() !time.Time {
 
 // write_ptr blocks and attempts to write all data
 pub fn (mut c TcpConn) write_ptr(b &u8, len int) !int {
+	$if trace_tcp_sock_handle ? {
+		eprintln('>>> TcpConn.write_ptr | c: ${ptr_str(c)} | c.sock.handle: ${c.sock.handle} | b: ${ptr_str(b)} | len: ${len}')
+	}
 	$if trace_tcp ? {
 		eprintln(
 			'>>> TcpConn.write_ptr | c.sock.handle: ${c.sock.handle} | b: ${ptr_str(b)} len: ${len} |\n' +
diff --git a/vlib/vweb/vweb.v b/vlib/vweb/vweb.v
index 66feb024b5..ebeca9b3b3 100644
--- a/vlib/vweb/vweb.v
+++ b/vlib/vweb/vweb.v
@@ -717,10 +717,16 @@ pub fn not_found() Result {
 }
 
 fn send_string(mut conn net.TcpConn, s string) ! {
+	$if trace_send_string_conn ? {
+		eprintln('> send_string: conn: ${ptr_str(conn)}')
+	}
 	$if trace_response ? {
 		eprintln('> send_string:\n${s}\n')
 	}
-	conn.write(s.bytes())!
+	if voidptr(conn) == unsafe { nil } {
+		return error('connection was closed before send_string')
+	}
+	conn.write_string(s)!
 }
 
 // Do not delete.