From 4da8ec0ac40a63f9a7089f330b128cdc05d63974 Mon Sep 17 00:00:00 2001
From: Mindy Batek <desisma@heidel.beer>
Date: Sat, 26 Jul 2025 00:51:26 +0200
Subject: [PATCH] Do not send empty chunk for HEAD requests
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HEAD requests are not supposed to have a body.

MDN suggests that…

> If a response to a HEAD request has a body, the response body must be ignored.

Web browser seem to handle such situations well.

Unfortunately, Node.js does not; instead it tries to parse the empty chunk
as a new HTTP response and reports an error.
(Code `HPE_INVALID_CONSTANT` with reason "Expected HTTP/")
---
 cgi.d | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cgi.d b/cgi.d
index 72cebbe..d1d2ad1 100644
--- a/cgi.d
+++ b/cgi.d
@@ -2735,7 +2735,7 @@ class Cgi {
 		}
 
 		// closing the last chunk...
-		if(nph && rawDataOutput !is null && responseChunked)
+		if(requestMethod != RequestMethod.HEAD && nph && rawDataOutput !is null && responseChunked)
 			rawDataOutput(cast(const(ubyte)[]) "0\r\n\r\n");
 
 		if(flushDelegate)