caddyserver/caddy · error

unexpected type from 'log' global options: %T

Error message

unexpected type from 'log' global options: %T

What it means

Error "unexpected type from 'log' global options: %T" thrown in caddyserver/caddy.

Source

Thrown at caddyconfig/httpcaddyfile/httptype.go:417

				existingOpts = []serverOptions{}
			}
			serverOpts, ok := val.(serverOptions)
			if !ok {
				return nil, fmt.Errorf("unexpected type from 'servers' global options: %T", val)
			}
			options[opt] = append(existingOpts, serverOpts)
			continue
		}
		// Additionally, fold multiple "log" options together into an
		// array so that multiple loggers can be configured.
		if opt == "log" {
			existingOpts, ok := options[opt].([]ConfigValue)
			if !ok {
				existingOpts = []ConfigValue{}
			}
			logOpts, ok := val.([]ConfigValue)
			if !ok {
				return nil, fmt.Errorf("unexpected type from 'log' global options: %T", val)
			}
			options[opt] = append(existingOpts, logOpts...)
			continue
		}
		// Also fold multiple "default_bind" options together into an
		// array so that server blocks can have multiple binds by default.
		if opt == "default_bind" {
			existingOpts, ok := options[opt].([]ConfigValue)
			if !ok {
				existingOpts = []ConfigValue{}
			}
			defaultBindOpts, ok := val.([]ConfigValue)
			if !ok {
				return nil, fmt.Errorf("unexpected type from 'default_bind' global options: %T", val)
			}
			options[opt] = append(existingOpts, defaultBindOpts...)
			continue
		}

View on GitHub (pinned to 50e54ee279)

Solutions

1. This is an internal type mismatch from the 'log' global option; check that any custom log option parser returns the expected type.

When it happens

Trigger: Thrown at caddyconfig/httpcaddyfile/httptype.go:417 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of caddyserver/caddy@50e54ee279 (2026-08-15). Data as JSON: /api/errors/f7ad5cbc41dd5c61. Report an issue: GitHub.