temporalio/temporal · error

failed to parse link header: invalid parameter format: %s

Error message

failed to parse link header: invalid parameter format: %s

What it means

Error "failed to parse link header: invalid parameter format: %s" thrown in temporalio/temporal.

Source

Thrown at common/nexus/nexusrpc/api.go:199

	params := strings.Split(encodedLink[urlEnd+1:], ";")
	// must contain at least one semi-colon, and first param must be empty since
	// it corresponds to the url part parsed above.
	if len(params) < 2 {
		return link, fmt.Errorf("failed to parse link header: invalid format: %s", encodedLink)
	}
	if strings.TrimSpace(params[0]) != "" {
		return link, fmt.Errorf("failed to parse link header: invalid format: %s", encodedLink)
	}

	typeKeyFound := false
	for _, param := range params[1:] {
		param = strings.TrimSpace(param)
		if len(param) == 0 {
			return link, fmt.Errorf("failed to parse link header: parameter is empty: %s", encodedLink)
		}
		kv := strings.SplitN(param, "=", 2)
		if len(kv) != 2 {
			return link, fmt.Errorf("failed to parse link header: invalid parameter format: %s", param)
		}
		key := strings.TrimSpace(kv[0])
		val := strings.TrimSpace(kv[1])
		if strings.HasPrefix(val, `"`) != strings.HasSuffix(val, `"`) {
			return link, fmt.Errorf(
				"failed to parse link header: parameter value missing double-quote: %s",
				param,
			)
		}
		if strings.HasPrefix(val, `"`) {
			val = val[1 : len(val)-1]
		}
		if key == linkTypeKey {
			if err := validateLinkType(val); err != nil {
				return link, fmt.Errorf("failed to parse link header: %w", err)
			}
			link.Type = val
			typeKeyFound = true

View on GitHub (pinned to bde624efd1)

When it happens

Trigger: Thrown at common/nexus/nexusrpc/api.go:199 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Parsing and encoding errors: unexpected token, malformed input — why parsers reject input and how to find the real culprit.

AI-assisted analysis of temporalio/temporal@bde624efd1 (2026-09-01). Data as JSON: /api/errors/0b5728b1bce6d509. Report an issue: GitHub.