From 4b1264cb26a481faf8448322ebb19b8993ae6aaf Mon Sep 17 00:00:00 2001
From: Dirk Engling <erdgeist@erdgeist.org>
Date: Fri, 30 Oct 2026 13:16:16 +0100
Subject: Don't treat a full send buffer as an error when sending http. Retry
 later

---
 ot_http.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ot_http.c b/ot_http.c
index d4c7363..e8ba3da 100644
--- a/ot_http.c
+++ b/ot_http.c
@@ -6,6 +6,7 @@
 /* System */
 #define _GNU_SOURCE
 #include <arpa/inet.h>
+#include <errno.h>
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -85,6 +86,12 @@ static void http_senddata(const int64_t sock, struct ot_workstruct *ws) {
     buf_reset(&cookie->request);
 
   written_size = write(sock, ws->reply, ws->reply_size);
+  /* A send buffer with no room in it is not a failure: nothing went out, so
+     the whole reply goes into the batch below and leaves when the socket
+     drains. Only a real error ends the connection here. */
+  if (written_size < 0 && (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR))
+    written_size = 0;
+
   if ((written_size < 0) || ((written_size == ws->reply_size) && !ws->keep_alive)) {
     http_close(sock);
     return;
-- 
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