Potential error for missing Retry-After header

[vinamogit]

dotnet-stellar-sdk/stellar-dotnet-sdk/requests/ResponseHandler.cs

Line 17 in 5ff3242

var retryAfter = int.Parse(response.Headers.GetValues("Retry-After").First());

The Retry-After header is not guaranteed to be sent by the horizon instance, this leads to an unexpected exception in Java implementation, reporting on dotnet for verification.

See lightsail-network/java-stellar-sdk#433

[elucidsoft]

I would guess this needs to be changed to FirstOrDefault if that is the case to prevent the exception.

[Kirbyrawr]

@elucidsoft can you do that please?

[elucidsoft]

Yes, will get a commit for this shortly.