Allow to remove the version string in HTTP responses.

Normally Unit responds to HTTP requests by including a header like

  Server: Unit/1.30.0

however it can sometimes be beneficial to withhold the version
information and in this case just respond with

  Server: Unit

This patch adds a new "settings.http" boolean option called
server_version, which defaults to true, in which case the full version
information is sent. However this can be set to false, e.g

  "settings": {
      "http": {
          "server_version": false
      }
  },

in which case Unit responds without the version information as the
latter example above shows.

Link: <https://www.ietf.org/rfc/rfc9110.html#section-10.2.4>
Closes: <https://github.com/nginx/unit/issues/158>
Reviewed-by: Alejandro Colomar <alx@nginx.com>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/nxt_router.h b/src/nxt_router.h
index 64095b69..6f0ba5ad 100644
--- a/src/nxt_router.h
+++ b/src/nxt_router.h
@@ -201,6 +201,8 @@ typedef struct {
 
     uint8_t                discard_unsafe_fields;  /* 1 bit */
 
+    uint8_t                server_version;         /* 1 bit */
+
     nxt_http_forward_t     *forwarded;
     nxt_http_forward_t     *client_ip;