/// <summary>
/// SendAsync override method.
/// Recursive call.
/// </summary>
/// <param name="request">The request given.</param>
/// <param name="cancellationToken">The cancelation token.</param>
/// <returns>The Http response.</returns>
protected override async Task <HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
Uri originalUri = request.RequestUri;
DnsEndPoint host = await TargetSelector.SelectHostAsync(ServiceDescription);
if (host == null)
{
Logger?.LogInformation("No Dns Host Found");
return(await base.SendAsync(request, cancellationToken));
}
request.RequestUri = ReplaceHost(request.RequestUri, host);
Logger?.LogInformation("Request uri : {requestRequestUri}", request.RequestUri);
var response = await base.SendAsync(request, cancellationToken);
if (response == null)
{
return(response);
}
Logger?.LogTrace("Response status code : {response.StatusCode}", response.StatusCode);
if (QuarantinePolicy.ShouldQuarantine(response))
{
Logger?.LogWarning("Host {host} (from original host {original_host}) is send in quarantine", host, originalUri.Host);
await TargetSelector.BlacklistHostForAsync(host, QuarantinePolicy.QuarantineDuration);
request.RequestUri = originalUri;
return(await SendAsync(request, cancellationToken));
}
return(response);
}