add taler-terms-version header

src/mte.ml

@@ -34,10 +34,9 @@ module Static = struct
      - and finally apply compression if that is allowed by the client
      - set ETAG header
      - If it did not change, a "304 Not Modified" response will be returned
+     - A "Taler-Terms-Version" header is generated to indicate the legal version of the terms
 
      TODO:
-       - The ETAG is encoded in Crockford base-32
-       - A "Taler-Terms-Version" header is generated to indicate the legal version of the terms
        - When returning a full response (not a "304 Not Modified"), the server
          should also include a "Avail-Languages" header which includes a
          comma-separated list of the languages in which the terms of service are available in
@@ -71,6 +70,11 @@ module Static = struct
         let* () = Vif.Response.with_string ?compression req data in
         let etag_field_value = Headers.Etag.to_field_value etag in
         let* () = Vif.Response.add ~field:"etag" etag_field_value in
+        let* () =
+          (* todo: is it "taler-privacy-version" for /policy ? *)
+          Vif.Response.add ~field:"taler-terms-version"
+            Config.terms_legal_version
+        in
         (* TODO content-type *)
         let* () =
           Vif.Response.add ~field:"content-type" "html; charset=utf-8"