/// <summary>
/// Handles correlation ID forwarding.
/// </summary>
/// <param name="requestHeaders">HTTP request headers.</param>
/// <returns>
/// HTTP request headers containing correlation ID (or unchanged, if forwarding not set).
/// </returns>
private HttpRequestHeaders HandleCorrelationIdForwarding(HttpRequestHeaders requestHeaders)
{
if (_settings.Settings == HeaderPropagation.NoPropagation)
{
return(requestHeaders);
}
var correlationContext = _correlationContextAccessor.CorrelationContext;
return((_settings.Settings, correlationContext) switch
{
(HeaderPropagation.UsePredefinedHeaderName, _) =>
requestHeaders.AddHeaderIfNotSet(
_settings.HeaderName,
correlationContext.CorrelationId),
(HeaderPropagation.KeepIncomingHeaderName, RequestCorrelationContext requestCorrelationContext) =>
requestHeaders.AddHeaderIfNotSet(
requestCorrelationContext.Header,
requestCorrelationContext.CorrelationId),
(HeaderPropagation.KeepIncomingHeaderName, GeneratedCorrelationContext generatedCorrelationContext) =>
requestHeaders.AddHeaderIfNotSet(
_settings.HeaderName,
generatedCorrelationContext.CorrelationId),
_ => requestHeaders,
});