firefly-iii/firefly-iii · error · BadHttpHeaderException

Sorry, Accept header "%s" is not something this endpoint can

Error message

Sorry, Accept header "%s" is not something this endpoint can provide.

What it means

Error "Sorry, Accept header "%s" is not something this endpoint can provide." thrown in firefly-iii/firefly-iii.

Source

Thrown at app/Api/V1/Controllers/Controller.php:96

    /**
     * Controller constructor.
     */
    public function __construct()
    {
        // get global parameters
        $this->middleware(function ($request, $next) {
            $this->parameters = $this->getParameters();
            if (auth()->check()) {
                $language               = Steam::getLanguage();
                $this->convertToPrimary = Amount::convertToPrimary();
                $this->primaryCurrency  = Amount::getPrimaryCurrency();
                app()->setLocale($language);
            }

            // filter down what this endpoint accepts.
            if (!$request->accepts($this->accepts)) {
                throw new BadHttpHeaderException(sprintf('Sorry, Accept header "%s" is not something this endpoint can provide.', $request->header('Accept')));
            }

            return $next($request);
        });
    }

    /**
     * Method to help build URL's.
     */
    final protected function buildParams(): string
    {
        $return = '?';
        $params = [];
        foreach ($this->parameters as $key => $value) {
            if ('page' === $key) {
                continue;
            }
            if ($value instanceof Carbon) {

View on GitHub (pinned to fd8791d08d)

When it happens

Trigger: Thrown at app/Api/V1/Controllers/Controller.php:96 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of firefly-iii/firefly-iii@fd8791d08d (2026-08-17). Data as JSON: /api/errors/5891206394277716. Report an issue: GitHub.