diff --git a/filed/src/web/forms.rs b/filed/src/web/forms.rs
index 1aafa80..6593938 100644
--- a/filed/src/web/forms.rs
+++ b/filed/src/web/forms.rs
@@ -5,11 +5,12 @@
 
 use std::collections::HashMap;
 
-use warp::{Filter, reply::Reply, reject::Rejection, filters::multipart::FormData};
+use askama::Template;
+use warp::{Filter, reply::{Reply, Html}, reject::Rejection, filters::multipart::FormData, http::StatusCode, Error};
 use futures_util::TryStreamExt;
 use bytes::BufMut;
 
-use super::state::SharedState;
+use super::{state::SharedState, pages::BadActionReq, rejection::HttpReject};
 
 pub async fn upload(form: FormData, _state: SharedState) -> Result<Box<dyn Reply>, Rejection> {
 
@@ -20,7 +21,31 @@ pub async fn upload(form: FormData, _state: SharedState) -> Result<Box<dyn Reply
         }
         
         Ok((field.name().into(), String::from_utf8_lossy(&bytes).to_string()))
-    }).try_collect().await.unwrap();
+    }).try_collect()
+      .await
+      .map_err(|err| warp::reject::custom(HttpReject::WarpError(err.into())))?;
+
+    // check that required fields exist
+    let mut all_exist = true;
+    let _ = vec!["delmode", "file"].iter().for_each(|x| {
+        let field = x.to_string();
+        if ! params.contains_key(&field) {
+            all_exist = false;
+        }
+    });
+
+    if ! all_exist {
+        return Ok(Box::new(
+            warp::reply::with_status(
+                warp::reply::html(
+                    BadActionReq {}
+                        .render()
+                        .map_err(|err| warp::reject::custom(HttpReject::AskamaError(err.into())))?
+                ),
+                StatusCode::BAD_REQUEST
+            )
+        ))
+    }
 
     Ok(Box::new(warp::reply::json(&params)))
 }
diff --git a/filed/src/web/mod.rs b/filed/src/web/mod.rs
index 521786b..b0af05a 100644
--- a/filed/src/web/mod.rs
+++ b/filed/src/web/mod.rs
@@ -11,6 +11,7 @@ use crate::env::Env;
 mod pages;
 mod forms;
 mod state;
+mod rejection;
 
 use state::SharedState;
 
diff --git a/filed/src/web/pages.rs b/filed/src/web/pages.rs
index 3a91a8a..d39fa36 100644
--- a/filed/src/web/pages.rs
+++ b/filed/src/web/pages.rs
@@ -9,7 +9,12 @@ use super::state::SharedState;
 
 #[derive(Template)]
 #[template( path = "index.html" )]
-struct Index {}
+pub struct Index {}
+
+#[derive(Template)]
+#[template( path = "bad_action_req.html" )]
+pub struct BadActionReq {}
+
 
 pub fn index() -> Html<String> {
     let rendered = Index {};
diff --git a/filed/src/web/rejection.rs b/filed/src/web/rejection.rs
new file mode 100644
index 0000000..e35816a
--- /dev/null
+++ b/filed/src/web/rejection.rs
@@ -0,0 +1,7 @@
+
+#[derive(Debug)]
+pub enum HttpReject {
+    WarpError(warp::Error),
+    AskamaError(askama::Error)
+}
+impl warp::reject::Reject for HttpReject {}
\ No newline at end of file
diff --git a/filed/templates/bad_action_req.html b/filed/templates/bad_action_req.html
new file mode 100644
index 0000000..63913c1
--- /dev/null
+++ b/filed/templates/bad_action_req.html
@@ -0,0 +1 @@
+{% extends "base.html" %}
\ No newline at end of file