Currently, when a server handler returns a (context) deadline exceeded error, this maps to a 408 http status code.

The 408 (Request Timeout) status code is generally used to indicate that the server did not receive a complete request message within the time that it was prepared to wait, for example if a client haven't yet sent the headers for a request.

As this is a server timeout, we should consider returning a 500 error instead, such as 504 (Gateway Timeout).