go-kratos/kratos · error

cannot register Codec with empty string result for Name()

Error message

cannot register Codec with empty string result for Name()

What it means

Error "cannot register Codec with empty string result for Name()" thrown in go-kratos/kratos.

Source

Thrown at encoding/encoding.go:30

	Marshal(v any) ([]byte, error)
	// Unmarshal parses the wire format into v.
	Unmarshal(data []byte, v any) error
	// Name returns the name of the Codec implementation. The returned string
	// will be used as part of content type in transmission. The result must be
	// static; the result cannot change between calls.
	Name() string
}

var registeredCodecs = make(map[string]Codec)

// RegisterCodec registers the provided Codec for use with all Transport clients and
// servers.
func RegisterCodec(codec Codec) {
	if codec == nil {
		panic("cannot register a nil Codec")
	}
	if codec.Name() == "" {
		panic("cannot register Codec with empty string result for Name()")
	}
	contentSubtype := strings.ToLower(codec.Name())
	registeredCodecs[contentSubtype] = codec
}

// GetCodec gets a registered Codec by content-subtype, or nil if no Codec is
// registered for the content-subtype.
//
// The content-subtype is expected to be lowercase.
func GetCodec(contentSubtype string) Codec {
	return registeredCodecs[contentSubtype]
}

View on GitHub (pinned to 668db92c2c)

When it happens

Trigger: Thrown at encoding/encoding.go:30 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of go-kratos/kratos@668db92c2c (2026-08-16). Data as JSON: /api/errors/341eabed4daa2be4. Report an issue: GitHub.