private static Func <DownstreamContext, bool> AddRpcMiddleware(this IOcelotPipelineBuilder builder)
{
builder.UseHttpHeadersTransformationMiddleware();
// Initialises downstream request
builder.UseDownstreamRequestInitialiser();
// We check whether the request is ratelimit, and if there is no continue processing
builder.UseRateLimiting();
// This adds or updates the request id (initally we try and set this based on global config in the error handling middleware)
// If anything was set at global level and we have a different setting at re route level the global stuff will be overwritten
// This means you can get a scenario where you have a different request id from the first piece of middleware to the request id middleware.
builder.UseRequestIdMiddleware();
// This takes the downstream route we retrieved earlier and replaces any placeholders with the variables that should be used
builder.UseDownstreamUrlCreatorMiddleware();
// We fire off the request and set the response on the scoped data repo
builder.UseRpcRequesterMiddleware();
// This check the downstream route scheme is tcp or custom scheme, for example @rpc
return(context => context.DownstreamReRoute.DownstreamScheme.Equals("tcp", StringComparison.OrdinalIgnoreCase));
}
