1 files changed, 43 insertions, 0 deletions
diff --git a/src/zenhttp/httpclient_test.cpp b/src/zenhttp/httpclient_test.cpp
index b0e097a54..ea73ff7a3 100644
--- a/src/zenhttp/httpclient_test.cpp
+++ b/src/zenhttp/httpclient_test.cpp
@@ -300,6 +300,49 @@ struct TestServerFixture
 
 TEST_SUITE_BEGIN("http.httpclient");
 
+TEST_CASE("httpclient.response.findheader.arena")
+{
+	// Async client populates HeaderArena (raw "Key: Value\r\n" bytes); FindHeader
+	// scans it lazily without building the full KeyValueMap. Exercise arena scan
+	// path independent of any live HTTP transfer.
+	HttpClient::Response Resp;
+	Resp.HeaderArena =
+		"Content-Type: application/json\r\n"
+		"ETag: \"abc-123\"\r\n"
+		"Content-Length: 42\r\n"
+		"X-Amz-Request-Id: deadbeef\r\n"
+		"\r\n";
+
+	CHECK_EQ(Resp.FindHeader("Content-Type"), "application/json");
+	CHECK_EQ(Resp.FindHeader("etag"), "\"abc-123\"");	// case-insensitive
+	CHECK_EQ(Resp.FindHeader("CONTENT-LENGTH"), "42");	// case-insensitive
+	CHECK_EQ(Resp.FindHeader("x-amz-request-id"), "deadbeef");
+	CHECK_EQ(Resp.FindHeader("missing"), "");  // absent
+	CHECK_EQ(Resp.FindHeader(""), "");		   // empty name
+}
+
+TEST_CASE("httpclient.response.findheader.map_fallback")
+{
+	// Sync client populates Header KeyValueMap; FindHeader falls back to it
+	// when HeaderArena is empty.
+	HttpClient::Response Resp;
+	Resp.Header->insert_or_assign("Content-Type", "text/plain");
+	Resp.Header->insert_or_assign("ETag", "\"xyz\"");
+
+	CHECK_EQ(Resp.FindHeader("content-type"), "text/plain");
+	CHECK_EQ(Resp.FindHeader("ETag"), "\"xyz\"");
+	CHECK_EQ(Resp.FindHeader("missing"), "");
+}
+
+TEST_CASE("httpclient.response.findheader.arena_takes_priority")
+{
+	// If both populated (unusual), arena is scanned first.
+	HttpClient::Response Resp;
+	Resp.HeaderArena = "ETag: from-arena\r\n";
+	Resp.Header->insert_or_assign("ETag", "from-map");
+	CHECK_EQ(Resp.FindHeader("ETag"), "from-arena");
+}
+
 TEST_CASE("httpclient.verbs")
 {
 	TestServerFixture Fixture;