src/Exception/ClientException.php
public function getHeaders() {
        $result = [];
        foreach ($this->context as $key => $value) {
            if (stripos($key, 'http_') === 0) {
                $key = Response::normalizeHeader(ltrim_substr($key, 'http_'));
                $result[$key] = $value;
            }
        }
        return $result;
    }
public function getHeaders() {
        $result = [];
        foreach ($this->context as $key => $value) {
            if (stripos($key, 'http_') === 0) {
                $key = Response::normalizeHeader(ltrim_substr($key, 'http_'));
                $result[$key] = $value;
            }
        }
        return $result;
    }
Gets the response headers that were set on the exception.

@return array Returns the headers for this exception.