Request::getBody(): string|null

200    public function getBody(): ?string201    {202        // GET requests don't have a body203        if (!$this->method->hasBody()) {204            return null;205        }206        // If body is set, return it as-is207        if ($this->body !== null) {208            return $this->body;209        }210        // If data is set, encode based on content type211        if ($this->data !== null) {212            $contentType = $this->getContentType();213            // JSON encoding214            if ($contentType !== null && stripos($contentType, 'application/json') !== \false) {215                return json_encode($this->data, \JSON_THROW_ON_ERROR);216            }217            // Default to URL encoding for forms218            return http_build_query($this->data);219        }220        return null;221    }