From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 22 Sep 2025 07:10:39 +0000 (+0200)
Subject: Revert "cf_socket_recv: don't count reading zero bytes as first byte"
X-Git-Tag: rc-8_17_0-1~266
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=66c7e92ae4ab824d5c838a207f742af1df6edaec;p=thirdparty%2Fcurl.git

Revert "cf_socket_recv: don't count reading zero bytes as first byte"

This reverts commit df60e8fe701e189e7629fd08b61950a0fb1b697a.

The "first byte" checkpoint is not strictly the first byte received, but
the sign of first traffic from the server, which a closed connection
also is.

Closes #18676
---

diff --git a/lib/cf-socket.c b/lib/cf-socket.c
index 2f0429efea..d5add9723f 100644
--- a/lib/cf-socket.c
+++ b/lib/cf-socket.c
@@ -1578,7 +1578,7 @@ static CURLcode cf_socket_recv(struct Curl_cfilter *cf, struct Curl_easy *data,
     *pnread = (size_t)nread;
 
   CURL_TRC_CF(data, cf, "recv(len=%zu) -> %d, %zu", len, result, *pnread);
-  if(!result && !ctx->got_first_byte && nread) {
+  if(!result && !ctx->got_first_byte) {
     ctx->first_byte_at = curlx_now();
     ctx->got_first_byte = TRUE;
   }