✨ Add a few common responses

new.go

@@ -0,0 +1,28 @@
+package errors
+
+import "net/http"
+
+// Represents a 404 error.
+func NewNotFound(format string, parts ...any) SettableError {
+	if format == "" {
+		format = "Not Found"
+	}
+
+	return Errorf(http.StatusNotFound, format, parts...)
+}
+
+// Represents a 400 error.
+func NewBadRequest(format string, parts ...any) SettableError {
+	if format == "" {
+		format = "Bad Request"
+	}
+
+	return Errorf(http.StatusBadRequest, format, parts...)
+}
+
+// Represents a 500 error. For this error, the user error is preset to "Unknown Error".
+func NewInternalError(format string, parts ...any) SettableError {
+	status := http.StatusInternalServerError
+	msg := "Unknown Error"
+	return Errorf(status, format, parts...).Msg(msg)
+}