diff --git a/Cargo.lock b/Cargo.lock
index 9a06d31d..4e1ad32f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -430,6 +430,7 @@ dependencies = [
  "bytes 0.4.12",
  "chrono",
  "crypto-mac",
+ "err-derive",
  "futures",
  "futures-util",
  "garage_model 0.1.1",
diff --git a/src/web/error.rs b/src/web/error.rs
new file mode 100644
index 00000000..094b22d0
--- /dev/null
+++ b/src/web/error.rs
@@ -0,0 +1,51 @@
+use err_derive::Error;
+use hyper::StatusCode;
+
+use garage_util::error::Error as GarageError;
+
+#[derive(Debug, Error)]
+pub enum Error {
+	// Category: internal error
+	#[error(display = "Internal error: {}", _0)]
+	InternalError(#[error(source)] GarageError),
+
+	#[error(display = "Internal error (Hyper error): {}", _0)]
+	Hyper(#[error(source)] hyper::Error),
+
+	#[error(display = "Internal error (HTTP error): {}", _0)]
+	HTTP(#[error(source)] http::Error),
+
+	// Category: cannot process
+	#[error(display = "Forbidden: {}", _0)]
+	Forbidden(String),
+
+	#[error(display = "Not found")]
+	NotFound,
+
+	// Category: bad request
+	#[error(display = "Invalid UTF-8: {}", _0)]
+	InvalidUTF8(#[error(source)] std::str::Utf8Error),
+
+	#[error(display = "Invalid XML: {}", _0)]
+	InvalidXML(#[error(source)] roxmltree::Error),
+
+	#[error(display = "Invalid header value: {}", _0)]
+	InvalidHeader(#[error(source)] hyper::header::ToStrError),
+
+	#[error(display = "Bad request: {}", _0)]
+	BadRequest(String),
+}
+
+impl Error {
+	pub fn http_status_code(&self) -> StatusCode {
+		match self {
+			Error::NotFound => StatusCode::NOT_FOUND,
+			Error::Forbidden(_) => StatusCode::FORBIDDEN,
+			Error::InternalError(GarageError::RPC(_)) => StatusCode::SERVICE_UNAVAILABLE,
+			Error::InternalError(_) | Error::Hyper(_) | Error::HTTP(_) => {
+				StatusCode::INTERNAL_SERVER_ERROR
+			}
+			_ => StatusCode::BAD_REQUEST,
+		}
+	}
+}
diff --git a/src/web/lib.rs b/src/web/lib.rs
index c0c668a1..f28937b9 100644
--- a/src/web/lib.rs
+++ b/src/web/lib.rs
@@ -1,4 +1,6 @@
 #[macro_use]
 extern crate log;
 
+pub mod error;
+
 pub mod web_server;
diff --git a/src/web/web_server.rs b/src/web/web_server.rs
index 3cc0fa43..4771d209 100644
--- a/src/web/web_server.rs
+++ b/src/web/web_server.rs
@@ -11,12 +11,13 @@ use hyper::service::{make_service_fn, service_fn};
 use hyper::{Body, Request, Response, Server};
 
 use garage_model::garage::Garage;
-use garage_util::error::Error;
+use garage_util::error::Error as GarageError;
+use crate::error::*;
 
 pub async fn run_web_server(
 	garage: Arc<Garage>,
 	shutdown_signal: impl Future<Output = ()>,
-) -> Result<(), Error> {
+) -> Result<(), GarageError> {
 	let addr = &garage.config.s3_web.bind_addr;
 
 	let service = make_service_fn(|conn: &AddrStream| {