private async Task <string> GetAsync(Uri path)
{
_log.Debug("Getting flags with uri: {0}", path.AbsoluteUri);
var request = new HttpRequestMessage(HttpMethod.Get, path);
_httpProperties.AddHeaders(request);
lock (_etags)
{
if (_etags.TryGetValue(path, out var etag))
{
request.Headers.IfNoneMatch.Add(etag);
}
}
using (var cts = new CancellationTokenSource(_connectTimeout))
{
try
{
using (var response = await _httpClient.SendAsync(request, cts.Token).ConfigureAwait(false))
{
if (response.StatusCode == HttpStatusCode.NotModified)
{
_log.Debug("Get all flags returned 304: not modified");
return(null);
}
//We ensure the status code after checking for 304, because 304 isn't considered success
if (!response.IsSuccessStatusCode)
{
throw new UnsuccessfulResponseException((int)response.StatusCode);
}
lock (_etags)
{
if (response.Headers.ETag != null)
{
_etags[path] = response.Headers.ETag;
}
else
{
_etags.Remove(path);
}
}
var content = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
return(string.IsNullOrEmpty(content) ? null : content);
}
}
catch (TaskCanceledException tce)
{
if (tce.CancellationToken == cts.Token)
{
//Indicates the task was cancelled by something other than a request timeout
throw;
}
//Otherwise this was a request timeout.
throw new TimeoutException("Get item with URL: " + path.AbsoluteUri +
" timed out after : " + _connectTimeout);
}
}
}
private HttpRequestMessage PrepareRequest(Uri uri, string payloadId)
{
var request = new HttpRequestMessage(HttpMethod.Post, uri);
_httpProperties.AddHeaders(request);
if (payloadId != null) // payloadId is provided for regular analytics events payloads, not for diagnostic events
{
request.Headers.Add("X-LaunchDarkly-Payload-ID", payloadId);
request.Headers.Add("X-LaunchDarkly-Event-Schema", CurrentSchemaVersion);
}
return(request);
}
