src/Server/StandardServer.php
public function executePsrRequest(ServerRequestInterface $request)
    {
        $parsedBody = $this->helper->parsePsrRequest($request);

        return $this->executeRequest($parsedBody);
    }
public function executePsrRequest(ServerRequestInterface $request)
    {
        $parsedBody = $this->helper->parsePsrRequest($request);

        return $this->executeRequest($parsedBody);
    }
Executes GraphQL operation and returns execution result
(or promise when promise adapter is different from SyncPromiseAdapter)

@return ExecutionResult|ExecutionResult[]|Promise

@api