code: final public function post(string $path, array $body = [], array $header = [], array $options = []): string
      {
          if ($this->hasLogger()) {
              $this->logger->info('Post to ' . $path);
          }
  
          return $this->requestGate(
              'POST',
              $path,
              $header,
              $body,
              $options
          );
      }
docs: post proxy
  
  @param \One\Collection|array $body