4 files changed, 12 insertions, 0 deletions
diff --git a/cgit.c b/cgit.c
index 19adadd..ae20257 100644
--- a/cgit.c
+++ b/cgit.c
@@ -208,2 +208,3 @@ static void prepare_context(struct cgit_context *ctx)
 	ctx->page.expires = ctx->page.modified;
+	ctx->page.etag = NULL;
 }
@@ -433,2 +434,3 @@ int main(int argc, const char **argv)
 	const char *cgit_config_env = getenv("CGIT_CONFIG");
+	const char *method = getenv("REQUEST_METHOD");
 	const char *path;
@@ -479,2 +481,4 @@ int main(int argc, const char **argv)
 	ctx.page.expires += ttl*60;
+	if (method && !strcmp(method, "HEAD"))
+		ctx.cfg.nocache = 1;
 	if (ctx.cfg.nocache)
diff --git a/cgit.h b/cgit.h
index 00aca4c..07a277a 100644
--- a/cgit.h
+++ b/cgit.h
@@ -182,2 +182,3 @@ struct cgit_page {
 	char *filename;
+	char *etag;
 	char *title;
diff --git a/ui-plain.c b/ui-plain.c
index 9a9ae7d..93a3a05 100644
--- a/ui-plain.c
+++ b/ui-plain.c
@@ -39,2 +39,3 @@ static void print_object(const unsigned char *sha1, const char *path)
 	ctx.page.size = size;
+	ctx.page.etag = sha1_to_hex(sha1);
 	cgit_print_http_headers(&ctx);
diff --git a/ui-shared.c b/ui-shared.c
index 29036d0..10be3c0 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -469,2 +469,4 @@ void cgit_print_http_headers(struct cgit_context *ctx)
 {
+	const char *method = getenv("REQUEST_METHOD");
+
 	if (ctx->page.status)
@@ -483,3 +485,7 @@ void cgit_print_http_headers(struct cgit_context *ctx)
 	htmlf("Expires: %s\n", http_date(ctx->page.expires));
+	if (ctx->page.etag)
+		htmlf("ETag: \"%s\"\n", ctx->page.etag);
 	html("\n");
+	if (method && !strcmp(method, "HEAD"))
+		exit(0);
 }