.h file
#pragma once
#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "ActorA.generated.h"
UCLASS()
class CPPHTTP_API AActorA : public AActor
{
GENERATED_BODY()
public:
AActorA();
protected:
virtual void BeginPlay() override;
public:
virtual void Tick(float DeltaTime) override;
UFUNCTION()
void sendStr();
UFUNCTION()
void getStr();
UFUNCTION()
void OnRequestComplete(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful);
};
.cpp file
#include "ActorA.h"
#include "Http.h"
#include ".h"
#include "Engine/Engine.h"
AActorA::AActorA()
{
}
void AActorA::sendStr()
{
FHttpModule* Http = &FHttpModule::Get();
TSharedRef<IHttpRequest> HttpRequest = Http->CreateRequest();
HttpRequest->SetVerb("POST");
HttpRequest->SetHeader("Content-Type", "text/plain");
HttpRequest->SetURL("localhost:8080/a");
HttpRequest->SetContentAsString("POST string from UE4");
HttpRequest->ProcessRequest();
}
void AActorA::getStr()
{
FHttpModule* Http = &FHttpModule::Get();
TSharedRef<IHttpRequest> HttpRequest = Http->CreateRequest();
HttpRequest->SetVerb("POST");
HttpRequest->SetURL("localhost:8080/b");
HttpRequest->OnProcessRequestComplete().BindUObject(this, &AActorA::OnRequestComplete);
HttpRequest->ProcessRequest();
}
void AActorA::OnRequestComplete(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful)
{
if (bWasSuccessful && Response->GetContentType() == TEXT("text/plain"))
{
FString result = Response->GetContentAsString();
GEngine->AddOnScreenDebugMessage(0, 4.0f, FColor::Orange, TEXT("%s"), *result);
}
else
{
GEngine->AddOnScreenDebugMessage(0, 4.0f, FColor::Emerald, TEXT("The Message Wanst receibed"));
}
}
void AActorA::BeginPlay()
{
Super::BeginPlay();
sendStr();
}
void AActorA::Tick(float DeltaTime)
{
Super::Tick(DeltaTime);
}
.Build.cs file
using UnrealBuildTool;
public class CPPhttp : ModuleRules
{
public CPPhttp(ReadOnlyTargetRules Target) : base(Target)
{
PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "Http", "", "JsonUtilities" });
PrivateDependencyModuleNames.AddRange(new string[] { });
// Uncomment if you are using Slate UI
// PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
// Uncomment if you are using online features
// PrivateDependencyModuleNames.Add("OnlineSubsystem");
// To include OnlineSubsystemSteam, add it to the plugins section in your uproject file with the Enabled attribute set to true
}
}
If I only write the code for sendStr() it works, but if I don’t comment out the other functions It doesn’t let me compile.
I have readen a lot of examples and I haven’t seen this problem.
you probably have null 
