code: func Default(method, contentType string) Binding {
  	if method == "GET" {
  		return Form
  	}
  
  	switch contentType {
  	case MIMEJSON:
  		return JSON
  	case MIMEXML, MIMEXML2:
  		return XML
  	case MIMEPROTOBUF:
  		return ProtoBuf
  	case MIMEMSGPACK, MIMEMSGPACK2:
  		return MsgPack
  	case MIMEYAML:
  		return YAML
  	case MIMEMultipartPOSTForm:
  		return FormMultipart
  	default: // case MIMEPOSTForm:
  		return Form
  	}
  }
docs: // Default returns the appropriate Binding instance based on the HTTP method
  // and the content type.