hashicorp/nomad · error

Unable to parse configured address: %v

Error message

Unable to parse configured address: %v

What it means

Later in pathToURL, when the constructed URL has an empty Host, the function falls back to parsing config.Address to borrow its host (and port). If that url.Parse call fails, it returns "Unable to parse configured address: %v" (note the capital U — distinct from the lowercase variant at line 441, which handles the scheme-overwrite path).

Source

Thrown at command/operator_api.go:463

			// identified a valid scheme.
			if confURL.Scheme == "http" || confURL.Scheme == "https" {
				scheme = confURL.Scheme
			}
		}

		path = fmt.Sprintf("%s://%s", scheme, path)
	}

	u, err := url.Parse(path)
	if err != nil {
		return nil, err
	}

	// If URL.Host is empty, use defaults from client config.
	if u.Host == "" {
		confURL, err := url.Parse(config.Address)
		if err != nil {
			return nil, fmt.Errorf("Unable to parse configured address: %v", err)
		}
		u.Host = confURL.Host
	}

	return u, nil
}

// headerFlags is a flag.Value implementation for collecting multiple -H flags.
type headerFlags struct {
	headers http.Header
}

func newHeaderFlags() *headerFlags {
	return &headerFlags{
		headers: make(http.Header),
	}
}

View on GitHub (pinned to 482b49bf1a)

Solutions

1. Set NOMAD_ADDR to a valid, complete URL: http://127.0.0.1:4646.
2. Pass a valid -address value explicitly for this command.
3. Audit client config files for malformed address entries.
4. Provide the full URL as the path argument (http://host:port/v1/...) so Host is non-empty.

Example fix

// before (shell)
NOMAD_ADDR="$HTTP_ENDPOINT" nomad operator api /v1/nodes   # variable empty/garbled
// after
NOMAD_ADDR="http://127.0.0.1:4646" nomad operator api /v1/nodes

// shell: guarantee a usable host is configured
: "${NOMAD_ADDR:=http://127.0.0.1:4646}"
case "$NOMAD_ADDR" in http://*|https://*) : ;; *) echo "bad NOMAD_ADDR"; exit 1 ;; esac

// bash
if ! out=$(nomad operator api "$API_PATH" 2>&1); then
  case "$out" in *"Unable to parse configured address"*) echo "NOMAD_ADDR invalid: $NOMAD_ADDR" ;; esac
fi

When it happens

Trigger: `nomad operator api ...` where the assembled request URL has no host (e.g. only a path was given and no -address-derived host applied) and config.Address itself fails url.Parse.

Common situations: Same root causes as the lowercase variant: corrupted NOMAD_ADDR, shell variable interpolation errors, malformed addresses in client config files, control characters introduced by copy-paste.

Understand the failure class

Background: "Invalid URL" / "URL cannot be empty": fix the malformed or missing URL behind request-construction failures — this error's family across 50 libraries.

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

Related errors

• unable to parse configured address: %v
• error determining port: %v
• no CNI network config found
• A template must be supplied using '-template' when using go-
• Invalid value for "-out"; valid values are [go-template, hcl

AI-assisted analysis of hashicorp/nomad@482b49bf1a (2026-09-04). Data as JSON: /api/errors/7d731bd6fb2262f3. Report an issue: GitHub.