How do get the request header details in custom graphQL mutation/query?

[mani_stelli]

I'm planning to send some info in the header when calling the magento graphQL API developed by me in a custom module. So how do I get the header info in the resolve method of my resolver class?

[biplabrout2bd3]

use Magento\Framework\HTTP\PhpEnvironment\Request as EnvRequest;

Then use it to get header value - 

$this->envRequest->getHeader('custom_header');