Improved error handling

Context.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"errors"
 	"io"
 	"net/http"
 	"unsafe"
@@ -12,8 +13,9 @@ const maxParams = 16
 // Context represents the interface for a request & response context.
 type Context interface {
 	Bytes([]byte) error
-	Error(int, error) error
+	Error(status int, messages ...any) error
 	Reader(io.Reader) error
+	SetStatus(status int)
 	String(string) error
 }
 
@@ -42,9 +44,20 @@ func (ctx *context) Bytes(body []byte) error {
 }
 
 // Error is used for sending error messages to the client.
-func (ctx *context) Error(status int, err error) error {
-	ctx.response.WriteHeader(status)
-	return err
+func (ctx *context) Error(status int, messages ...any) error {
+	var combined []error
+
+	for _, msg := range messages {
+		switch err := msg.(type) {
+		case error:
+			combined = append(combined, err)
+		case string:
+			combined = append(combined, errors.New(err))
+		}
+	}
+
+	ctx.SetStatus(status)
+	return errors.Join(combined...)
 }
 
 // Reader sends the contents of the io.Reader without creating an in-memory copy.
@@ -53,6 +66,11 @@ func (ctx *context) Reader(reader io.Reader) error {
 	return err
 }
 
+// SetStatus writes the header with the given HTTP status code.
+func (ctx *context) SetStatus(status int) {
+	ctx.response.WriteHeader(status)
+}
+
 // String responds with the given string.
 func (ctx *context) String(body string) error {
 	slice := unsafe.Slice(unsafe.StringData(body), len(body))