From f7d4dbfb22b447dfff94fe00aee0690ee0301a2d Mon Sep 17 00:00:00 2001
From: Alfred Morgan <alfred@54.org>
Date: Tue, 15 Jul 2025 20:46:52 -0700
Subject: [PATCH] respond can send more data than 64k

---
 src/fastcgi/server.nim | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/src/fastcgi/server.nim b/src/fastcgi/server.nim
index 194466a..543ba03 100644
--- a/src/fastcgi/server.nim
+++ b/src/fastcgi/server.nim
@@ -143,10 +143,20 @@ proc respond*(req: Request, content = "", headers: HttpHeaders = nil, appStatus:
   if content.len > 0:
     payload.add(&"\c\L{content}")
 
-  var header = initHeader(FCGI_STDOUT, req.id, payload.len, 0)
-  await req.client.send(addr header, FCGI_HEADER_LENGTH)
-  if payload.len > 0:
-    await req.client.send(payload.cstring, payload.len)
+  var header = initHeader(FCGI_STDOUT, req.id, -1, 0)
+  var sent = 0
+  var remaining = payload.len
+
+  while remaining > 0:
+    let chunkLen = min(remaining, FCGI_MAX_LENGTH)
+    header.contentLengthB1 = uint8((chunkLen shr 8) and 0xff)
+    header.contentLengthB0 = uint8(chunkLen and 0xff)
+    await req.client.send(addr header, FCGI_HEADER_LENGTH)
+    await req.client.send(addr payload[sent], chunkLen)
+    sent.inc(chunkLen)
+    remaining.dec(chunkLen)
+
+  if sent > 0:
     header.contentLengthB1 = 0
     header.contentLengthB0 = 0
     await req.client.send(addr header, FCGI_HEADER_LENGTH)