diff --git a/core/src/requests/threads.rs b/core/src/requests/threads.rs
index a3eddf8..ed6e5c3 100644
--- a/core/src/requests/threads.rs
+++ b/core/src/requests/threads.rs
@@ -109,6 +109,7 @@ pub mod create {
 
     #[data]
     pub enum Err {
+        #[display("{_0}")]
         NoSuchBoard(#[from] errors::boards::NotFound),
     }
 }
diff --git a/http/src/requests/mod.rs b/http/src/requests/mod.rs
index ca774b7..9761f3c 100644
--- a/http/src/requests/mod.rs
+++ b/http/src/requests/mod.rs
@@ -4,7 +4,7 @@ pub trait Request:
     Send + Sync + 'static + for<'de> serde::Deserialize<'de> + serde::Serialize
 {
     type Response: IsResponse;
-    type Error: IsResponse;
+    type Error: IsResponse + std::fmt::Display;
 }
 
 eva::trait_set! {
diff --git a/http/src/server/mod.rs b/http/src/server/mod.rs
index f07dd24..fcfa416 100644
--- a/http/src/server/mod.rs
+++ b/http/src/server/mod.rs
@@ -1,4 +1,6 @@
-use eva::{logging as log, perfect_derive, component_configs::ComponentConfig, supervisor::SlaveRx};
+use eva::{
+    component_configs::ComponentConfig, logging as log, perfect_derive, supervisor::SlaveRx,
+};
 
 use eyre::Context;
 use viendesu_core::{
@@ -23,14 +25,20 @@ pub trait Types: Send + Sync + 'static {
     type Service: Service + Clone;
 }
 
-pub async fn serve(rx: SlaveRx, config: ComponentConfig<Config>, router: axum::Router) -> eyre::Result<()> {
+pub async fn serve(
+    rx: SlaveRx,
+    config: ComponentConfig<Config>,
+    router: axum::Router,
+) -> eyre::Result<()> {
     // TODO: use it.
     _ = rx;
     let config::Config {
         unencrypted,
         ssl: _,
     } = &*config;
-    let unencrypted = unencrypted.as_ref().expect("SSL-only currently is not supported");
+    let unencrypted = unencrypted
+        .as_ref()
+        .expect("SSL-only currently is not supported");
 
     if !unencrypted.enable {
         return Ok(());
diff --git a/http/src/server/response/mod.rs b/http/src/server/response/mod.rs
index f0ab89b..68dfd9f 100644
--- a/http/src/server/response/mod.rs
+++ b/http/src/server/response/mod.rs
@@ -1,3 +1,5 @@
+use std::fmt;
+
 use axum::{
     http::StatusCode,
     response::{IntoResponse, Response as AxumResponse},
@@ -17,10 +19,11 @@ macro_rules! header {
 }
 
 #[track_caller]
-pub fn err<E: IsResponse>(format: Format, error: E) -> AxumResponse {
+pub fn err<E: IsResponse + fmt::Display>(format: Format, error: E) -> AxumResponse {
     #[derive(Serialize, Deserialize)]
     struct Failure<E> {
         pub error: E,
+        pub description: String,
     }
 
     impl<T: HasStatusCode> HasStatusCode for Failure<T> {
@@ -29,7 +32,13 @@ pub fn err<E: IsResponse>(format: Format, error: E) -> AxumResponse {
         }
     }
 
-    respond(format, Failure { error })
+    respond(
+        format,
+        Failure {
+            description: error.to_string(),
+            error,
+        },
+    )
 }
 
 #[track_caller]