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 2f0429efeae627a6f225ea6b1890e7f5055e683f..d5add9723f0d8ad8fb7e48e358164c15feac54e0 100644 (file)
--- 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;
   }