it appears actix-web's scope behaviour has changed in the latest beta

release:

Routes 404'd when scope contained trailing slash like so:
let scope = "/api/v1/pow/";
web::scope(scope)//

So had to rm trailing slash in scope

src/errors.rs

@@ -19,10 +19,9 @@ use std::convert::From;
 
 use actix::MailboxError;
 use actix_web::{
-    dev::BaseHttpResponseBuilder as HttpResponseBuilder,
     error::ResponseError,
     http::{header, StatusCode},
-    HttpResponse,
+    HttpResponse, HttpResponseBuilder,
 };
 use argon2_creds::errors::CredsError;
 use derive_more::{Display, Error};