UE4 Reference C++ Custom Function Library

So im trying to download a text file and return that file back as an Array but im having troubles since it wants me to refrence my custom function library

UFUNCTION(Blueprintpure, Category = "DanCode")
		void HttpRequest(FString Link, FString& File);

and my .cpp , that value I want exported is the one called Downloaded, I want it exported through my HttRequest Fucntion back to me when I recall it in blueprints but it wants a Refrence to this class.

void UCustomblueprintfunctionlibrary::HttpRequest(FString Link, FString& File)
{
	
	FHttpModule * http = &FHttpModule::Get();
	TSharedRef<IHttpRequest> Request = http->CreateRequest();
	Request->OnProcessRequestComplete().BindUObject(this, &UCustomblueprintfunctionlibrary::OnResponseReceived);
	//This is the url on which to process the request
	Request->SetURL("file:///C:/Bitnami/wampstack-5.6.30-1/apache2/htdocs/download.php");
	Request->SetVerb("GET");
	Request->SetHeader(TEXT("User-Agent"), "X-UnrealEngine-Agent");
	Request->SetHeader("Content-Type", TEXT("application/json"));
	Request->ProcessRequest();
}
void UCustomblueprintfunctionlibrary::OnResponseReceived(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful)
{

	//Create a pointer to hold the json serialized data
	TSharedPtr<FJsonObject> JsonObject;

	//Create a reader pointer to read the json data
	TSharedRef<TJsonReader<>> Reader = TJsonReaderFactory<>::Create(Response->GetContentAsString());

	//Deserialize the json data given Reader and the actual object to deserialize
	if (FJsonSerializer::Deserialize(Reader, JsonObject))
	{
		//Get the value of the json object by field name
		int32 recievedInt = JsonObject->GetIntegerField("customInt");

		//Output it to the engine
		FString AbsoluteFilePath = "C:/Users/RG STUDIOS/Desktop/DOWNLOADED.txt";
		FString Downloaded = FString::FromInt(recievedInt);
		HttpRequest(Downloaded, Downloaded);
	}