diff --git a/hub/errs/types.go b/hub/errs/types.go
index fbd9cf7..86a8c9e 100644
--- a/hub/errs/types.go
+++ b/hub/errs/types.go
@@ -17,7 +17,7 @@ func (e *Error) Error() string {
 var (
 	ErrUnexpected    = Internal.WithMsg("Unexpected internal error.")
 	ErrNotFound      = NotFound.WithMsg("Not found.")
-	ErrAlreadyExists = Conflict.WithMsg("AlreadyExists.")
+	ErrAlreadyExists = Conflict.WithMsg("Already exists.")
 
 	// Validation errors.
 	ErrInvalidIP       = BadRequest.WithMsg("Invalid IP.")
diff --git a/hub/handler.go b/hub/handler.go
index 2614621..ec6aa21 100644
--- a/hub/handler.go
+++ b/hub/handler.go
@@ -1,8 +1,11 @@
 package hub
 
 import (
+	"errors"
+	"log"
 	"net/http"
 	"vppn/hub/api"
+	"vppn/hub/errs"
 
 	"git.crumpington.com/lib/go/webutil"
 )
@@ -21,7 +24,7 @@ func (app *App) handlePub(pattern string, fn handlerFunc) {
 		}
 
 		if err := fn(&s, w, r); err != nil {
-			http.Error(w, err.Error(), http.StatusInternalServerError)
+			handleError(w, err)
 		}
 	}
 
@@ -68,8 +71,7 @@ func (app *App) handlePeer(pattern string, fn peerHandlerFunc) {
 
 		r.ParseForm()
 		if err := fn(peer, w, r); err != nil {
-			http.Error(w, err.Error(), http.StatusInternalServerError)
-			return
+			handleError(w, err)
 		}
 	}
 
@@ -77,3 +79,13 @@ func (app *App) handlePeer(pattern string, fn peerHandlerFunc) {
 		webutil.WithLogging(
 			wrapped))
 }
+
+func handleError(w http.ResponseWriter, err error) {
+	var e *errs.Error
+	if errors.As(err, &e) {
+		http.Error(w, e.Msg, e.Code)
+	} else {
+		log.Printf("Unexpected error: %v", err)
+		http.Error(w, "Internal server error.", http.StatusInternalServerError)
+	}
+}