thodg/libgit2

diff --git a/src/remote.c b/src/remote.c
index 84b8d59..2f8ffcb 100644
--- a/src/remote.c
+++ b/src/remote.c
@@ -689,7 +689,7 @@ int set_transport_callbacks(git_transport *t, const git_remote_callbacks *cbs)
 
 static int set_transport_custom_headers(git_transport *t, const git_strarray *custom_headers)
 {
-	if (!t->set_custom_headers || !custom_headers)
+	if (!t->set_custom_headers)
 		return 0;
 
 	return t->set_custom_headers(t, custom_headers);
diff --git a/src/transports/http.c b/src/transports/http.c
index 73ea050..e5f2b9f 100644
--- a/src/transports/http.c
+++ b/src/transports/http.c
@@ -211,11 +211,9 @@ static int gen_request(
 	} else
 		git_buf_puts(buf, "Accept: */*\r\n");
 
-	if (t->owner->custom_headers) {
-		for (i = 0; i < t->owner->custom_headers->count; i++) {
-			if (t->owner->custom_headers->strings[i])
-				git_buf_printf(buf, "%s\r\n", t->owner->custom_headers->strings[i]);
-		}
+	for (i = 0; i < t->owner->custom_headers.count; i++) {
+		if (t->owner->custom_headers.strings[i])
+			git_buf_printf(buf, "%s\r\n", t->owner->custom_headers.strings[i]);
 	}
 
 	/* Apply credentials to the request */
diff --git a/src/transports/smart.c b/src/transports/smart.c
index 8c5bc89..b0611c3 100644
--- a/src/transports/smart.c
+++ b/src/transports/smart.c
@@ -124,6 +124,12 @@ static int git_smart__set_custom_headers(
 	transport_smart *t = (transport_smart *)transport;
 	size_t i;
 
+	if (t->custom_headers.count)
+		git_strarray_free(&t->custom_headers);
+
+	if (!custom_headers)
+		return 0;
+
 	for (i = 0; i < custom_headers->count; i++) {
 		if (is_malformed_http_header(custom_headers->strings[i])) {
 			giterr_set(GITERR_INVALID, "custom HTTP header '%s' is malformed", custom_headers->strings[i]);
@@ -135,9 +141,7 @@ static int git_smart__set_custom_headers(
 		}
 	}
 
-	t->custom_headers = custom_headers;
-
-	return 0;
+	return git_strarray_copy(&t->custom_headers, custom_headers);
 }
 
 int git_smart__update_heads(transport_smart *t, git_vector *symrefs)
@@ -436,6 +440,8 @@ static void git_smart__free(git_transport *transport)
 
 	git_vector_free(refs);
 
+	git_strarray_free(&t->custom_headers);
+
 	git__free(t);
 }
 
diff --git a/src/transports/smart.h b/src/transports/smart.h
index 2c87e02..800466a 100644
--- a/src/transports/smart.h
+++ b/src/transports/smart.h
@@ -139,7 +139,7 @@ typedef struct {
 	git_transport_message_cb error_cb;
 	git_transport_certificate_check_cb certificate_check_cb;
 	void *message_cb_payload;
-	const git_strarray *custom_headers;
+	git_strarray custom_headers;
 	git_smart_subtransport *wrapped;
 	git_smart_subtransport_stream *current_stream;
 	transport_smart_caps caps;
diff --git a/src/transports/winhttp.c b/src/transports/winhttp.c
index 5b00d90..b364e90 100644
--- a/src/transports/winhttp.c
+++ b/src/transports/winhttp.c
@@ -410,21 +410,19 @@ static int winhttp_stream_connect(winhttp_stream *s)
 		}
 	}
 
-	if (t->owner->custom_headers) {
-		for (i = 0; i < t->owner->custom_headers->count; i++) {
-			if (t->owner->custom_headers->strings[i]) {
-				git_buf_clear(&buf);
-				git_buf_puts(&buf, t->owner->custom_headers->strings[i]);
-				if (git__utf8_to_16(ct, MAX_CONTENT_TYPE_LEN, git_buf_cstr(&buf)) < 0) {
-					giterr_set(GITERR_OS, "Failed to convert custom header to wide characters");
-					goto on_error;
-				}
+	for (i = 0; i < t->owner->custom_headers.count; i++) {
+		if (t->owner->custom_headers.strings[i]) {
+			git_buf_clear(&buf);
+			git_buf_puts(&buf, t->owner->custom_headers.strings[i]);
+			if (git__utf8_to_16(ct, MAX_CONTENT_TYPE_LEN, git_buf_cstr(&buf)) < 0) {
+				giterr_set(GITERR_OS, "Failed to convert custom header to wide characters");
+				goto on_error;
+			}
 
-				if (!WinHttpAddRequestHeaders(s->request, ct, (ULONG)-1L,
-					WINHTTP_ADDREQ_FLAG_ADD | WINHTTP_ADDREQ_FLAG_REPLACE)) {
-					giterr_set(GITERR_OS, "Failed to add a header to the request");
-					goto on_error;
-				}
+			if (!WinHttpAddRequestHeaders(s->request, ct, (ULONG)-1L,
+				WINHTTP_ADDREQ_FLAG_ADD | WINHTTP_ADDREQ_FLAG_REPLACE)) {
+				giterr_set(GITERR_OS, "Failed to add a header to the request");
+				goto on_error;
 			}
 		}
 	}