HttpServerがあったので使ってみた

// Fill out your copyright notice in the Description page of Project Settings.

#include "HttpServerActor.h"
#include "HTTPServer/Public/HttpPath.h"

#include "HTTPServer/Public/HttpResultCallback.h"
#include "HTTPServer/Public/HttpServerRequest.h"
#include "HTTPServer/Public/HttpServerResponse.h"
#include "Core/Public/Modules/ModuleManager.h"

// Sets default values
AHttpServerActor::AHttpServerActor()
{
    // Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = true;
    bClosed = false;
}

// Called when the game starts or when spawned
void AHttpServerActor::BeginPlay()
{
    Super::BeginPlay();

    Server = &FHttpServerModule::Get();
    UE_LOG(LogTemp, Log, TEXT("サーバー開始"));

    FHttpPath HttpPath(TEXT("/test_api")); // 指定した名前をURLに使用してアクセス(http://127.0.0.1/test_api でアクセス)
    Router = Server->GetHttpRouter(1080);  // 使用しているポートと重複しない任意のポートを指定

    RouteHandle = Router->BindRoute(
        HttpPath,
        EHttpServerRequestVerbs::VERB_GET | EHttpServerRequestVerbs::VERB_POST,
        [this](const FHttpServerRequest &Request, const FHttpResultCallback &OnComplete) {
            UE_LOG(LogTemp, Log, TEXT("リクエスト検出"));

            // 変換は FHttpConnectionRequestReadContext::ParseHeader() を参照
            FUTF8ToTCHAR WByteBuffer(reinterpret_cast<const ANSICHAR *>(Request.Body.GetData()), Request.Body.Num());
            FString str = WByteBuffer.Get();

            UE_LOG(LogTemp, Log, TEXT("%s"), *str);

            // クエリも参照可能
            // URLの「?」の後ろの部分、この場合「abc」と「name」 http://127.0.0.1/test_api?abc=123&name=hello
            for (auto param : Request.QueryParams)
            {
                UE_LOG(LogTemp, Log, TEXT("%s->%s"), *param.Key, *param.Value);
            }

            if (OnRequestReceived.IsBound())
            {
                OnRequestReceived.Broadcast(str);
            }

            OnComplete(FHttpServerResponse::Ok());

            return true;
        });

    Server->StartAllListeners();
}

void AHttpServerActor::EndPlay(const EEndPlayReason::Type EndPlayReason)
{
    if (bClosed)
    {
        return;
    }

    UE_LOG(LogTemp, Log, TEXT("Stop HTTP"));
    Server->StopAllListeners();

    if (Router)
    {
        Router->UnbindRoute(RouteHandle);
    }

    bClosed = true;
}

// Called every frame
void AHttpServerActor::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);
}

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "HTTPServer/Public/HttpServerModule.h"
#include "HTTPServer/Public/IHttpRouter.h"

#include "CoreMinimal.h"
#include "HttpServerActor.generated.h"

UCLASS()
class UE4TESTSCRIPTING_API AHttpServerActor : public AActor
{
    GENERATED_BODY()

private:
    FHttpServerModule *Server;
    TSharedPtr<IHttpRouter> Router;
    FHttpRouteHandle RouteHandle;
    bool bClosed;

public:
    // Sets default values for this actor's properties
    AHttpServerActor();

    DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FRequestReceivedDelegate, FString, Body);

    UPROPERTY(BlueprintAssignable, Category = "Http")
    FRequestReceivedDelegate OnRequestReceived;

protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;
    virtual void EndPlay(const EEndPlayReason::Type EndPlayReason) override;

public:
    // Called every frame
    virtual void Tick(float DeltaTime) override;
};