httpd: Don't add Date header to response

RFC 2616 sec. 14.18 says that server MUST send Date header.
But in fact the header make sense only for Cache-Control and can be omitted.
In the same time the Date eats power, CPU and network resources which are critical for embedded systems.

Signed-off-by: Sergey Ponomarev <stokito@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 16 insertions, 2 deletions

diff --git a/networking/httpd.c b/networking/httpd.c
index 9141442c8..a1f841aa8 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -214,6 +214,14 @@
 //config:       help
 //config:       Makes httpd send files using GZIP content encoding if the
 //config:       client supports it and a pre-compressed <file>.gz exists.
+//config:
+//config:config FEATURE_HTTPD_DATE
+//config:       bool "Add Date header to response"
+//config:       default y
+//config:       depends on HTTPD
+//config:       help
+//config:       RFC2616 says that server MUST add Date header to response.
+//config:       But it is almost useless and can be omitted.
 
 //applet:IF_HTTPD(APPLET(httpd, BB_DIR_USR_SBIN, BB_SUID_DROP))
 
@@ -1071,14 +1079,20 @@ static void send_headers(unsigned responseNum)
          * always fit into those kbytes.
          */
 
+#if ENABLE_FEATURE_HTTPD_DATE
         strftime(date_str, sizeof(date_str), RFC1123FMT, gmtime_r(&timer, &tm));
         /* ^^^ using gmtime_r() instead of gmtime() to not use static data */
+#endif
         len = sprintf(iobuf,
                         "HTTP/1.1 %u %s\r\n"
+#if ENABLE_FEATURE_HTTPD_DATE
                         "Date: %s\r\n"
+#endif
                         "Connection: close\r\n",
-                        responseNum, responseString,
-                        date_str
+                        responseNum, responseString
+#if ENABLE_FEATURE_HTTPD_DATE
+                        ,date_str
+#endif
         );
 
         if (responseNum != HTTP_OK || found_mime_type) {