package cors type Config struct { origin string methods string } type ConfigOption func(*Config) type ConfigOptions []ConfigOption func (s *ConfigOptions) Add(option ConfigOption) { *s = append(*s, option) } func NewConfig(opts ...ConfigOption) Config { c := &Config{} for _, opt := range opts { opt(c) } return *c } func WithOrigin(origin string) ConfigOption { return func(s *Config) { s.origin = origin } } func WithMethods(methods string) ConfigOption { return func(s *Config) { s.methods = methods } }