private async Task <HttpResponseMessage> ExecuteServiceCallAsync(HttpCommunicationClient client, HttpContext context, byte[] contextRequestBody)
{
// We don't throw because this would result in a retry loop.
if (context.RequestAborted.IsCancellationRequested)
{
return(null);
}
// create request and copy all details
HttpRequestMessage req = new HttpRequestMessage
{
Method = new HttpMethod(context.Request.Method),
RequestUri = new Uri(context.Request.Path + context.Request.QueryString, UriKind.Relative)
};
if (contextRequestBody != null)
{
req.Content = new ByteArrayContent(contextRequestBody);
}
req.CopyHeadersFromCurrentContext(context);
req.AddProxyHeaders(context);
// execute request
HttpResponseMessage response;
try
{
response = await client.SendAsync(req, context.RequestAborted, _gatewayOptions.ShouldForwardCookies);
}
catch (OperationCanceledException) when(context.RequestAborted.IsCancellationRequested)
{
// We don't have to retry if the client is no longer connected.
return(null);
}
// cases in which we want to invoke the retry logic from the ClientFactory
InvokeRetryIfNecessary(response);
return(response);
}
private async Task <HttpResponseMessage> ExecuteServiceCallAsync(HttpCommunicationClient httpClient, HttpContext context, ServiceProviderInfomation options)
{
var requestMessage = new HttpRequestMessage();
//
// Copy the request method
//
requestMessage.Method = new HttpMethod(context.Request.Method);
//
// Copy the request content
//
if (!StringComparer.OrdinalIgnoreCase.Equals(context.Request.Method, "GET") &&
!StringComparer.OrdinalIgnoreCase.Equals(context.Request.Method, "HEAD") &&
!StringComparer.OrdinalIgnoreCase.Equals(context.Request.Method, "DELETE") &&
!StringComparer.OrdinalIgnoreCase.Equals(context.Request.Method, "TRACE"))
{
requestMessage.Content = new StreamContent(context.Request.Body);
}
requestMessage.CopyHeadersFromCurrentContext(context);
requestMessage.AddProxyHeaders(context);
//
// Construct the request URL
//
var baseAddress = httpClient.BaseAddress;
// Sticky Sessions
string value;
context.Request.Cookies.TryGetValue("SERVER-SF", out value);
if (options.StickySession && !string.IsNullOrEmpty(value))
{
baseAddress = new Uri(value);
}
var pathAndQuery = PathString.FromUriComponent(baseAddress) + context.Request.Path + context.Request.QueryString;
requestMessage.RequestUri = new Uri($"{baseAddress.Scheme}://{baseAddress.Host}:{baseAddress.Port}{pathAndQuery}", UriKind.Absolute);
//
// Send request and copy the result back to HttpResponse
//
var responseMessage = await httpClient.SendAsync(requestMessage, HttpCompletionOption.ResponseHeadersRead, context.RequestAborted);
//
// If the service is temporarily unavailable, throw to retry later.
//
if (responseMessage.StatusCode == HttpStatusCode.ServiceUnavailable)
{
responseMessage.EnsureSuccessStatusCode();
}
// cases in which we want to invoke the retry logic from the ClientFactory
int statusCode = (int)responseMessage.StatusCode;
if ((statusCode >= 500 && statusCode < 600) || statusCode == (int)HttpStatusCode.NotFound)
{
throw new SimpleHttpResponseException(responseMessage.StatusCode, "Service call failed");
}
if (options.StickySession && string.IsNullOrEmpty(value))
{
context.Response.Cookies.Append("SERVER-SF", baseAddress.AbsoluteUri);
}
return(responseMessage);
}