httpd: send location: header for 307 and 308 status codes

[Sebastian Benoit]

308 and 307 are the new 301 and 302 HTTP Status Codes:

https://tools.ietf.org/html/rfc7538
https://tools.ietf.org/html/rfc7231#section-6.4.7

   ...
   The server SHOULD generate a Location header field ([RFC7231],
   Section 7.1.2) in the response containing a preferred URI reference
   ...


ok?

diff --git usr.sbin/httpd/server_http.c usr.sbin/httpd/server_http.c
index e64de0d2f9c..48bc773332a 100644
--- usr.sbin/httpd/server_http.c
+++ usr.sbin/httpd/server_http.c
@@ -875,6 +875,8 @@ server_abort_http(struct client *clt, unsigned int code, 
const char *msg)
        case 301:
        case 302:
        case 303:
+       case 307:
+       case 308:
                if (msg == NULL)
                        break;
                memset(buf, 0, sizeof(buf));