change header lower case rfc9113

diff --git a/src/kds_s2000w_client.c b/src/kds_s2000w_client.c
index c004d8eccc5054ce060fddde891831209ba9db77..45af6fef70e8b1294dddb005fba7409841822d6a 100644 (file)
--- a/src/kds_s2000w_client.c
+++ b/src/kds_s2000w_client.c
@@ -11,9 +11,9 @@
 #define HTTP_PUT "PUT"
 
 #define X_STATUS_HEADER "x-status"
-#define CONTENT_TYPE_HEADER "Content-Type: application/json"
-#define ACCEPT_JSON_HEADER "Accept: application/json"
-#define ACCEPT_IMAGE_HEADER "Accept: image/jpeg,image/tiff"
+#define CONTENT_TYPE_HEADER "content-type: application/json"
+#define ACCEPT_JSON_HEADER "accept: application/json"
+#define ACCEPT_IMAGE_HEADER "accept: image/jpeg,image/tiff"
 
 #define SESSION_PATH "/api/session"
 #define STATUS_PATH "/api/session/status"