Send HTTP POST with Unreal Engine

I created an in-game bug reporter for Industries of Titan. Users can type in a message and it gets sent, along with a screenshot and a zip of their latest save to a server for us to look through.

This is an example of how to set up something similar in C++.

Update: @sswires89 pointed out that this relies on MimeHttpUpload.h which is currently only available through UDN. Sorry about the confusion!

BUIUploader.h

#pragma once

#include "Interfaces/IHttpRequest.h"
#include "HttpModule.h"
#include "UI/Util/MimeHttpUpload.h"
#include "BUIUploader.generated.h"

class UBUIUploader
{
	GENERATED_BODY()
public:
	UBUIUploader(const FObjectInitializer& ObjectInitializer);

	FOnMimeUploadHttpRequestComplete RequestCompleteDelegate;

	void SendReport();
}

BUIUploader.cpp

#include "BUIUploader.h"

#include "Interfaces/IHttpResponse.h"
#include "UI/Util/MimeHttpUpload.h"
#include "Windows/WindowsPlatformMisc.h"
#include "GenericPlatformFile.h"

UBUIUploader::UBUIUploader(const FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer)
{
	// This will be called when the HTTP post is complete
	RequestCompleteDelegate.BindUObject(this, &UBUIUploader::OnRequestComplete);
}

void UBUIUploader::SendReport()
{
	TSharedRef<FMimeHttpUpload> MimeUpload = FMimeHttpUpload::Create();

	// Basic string values
	MimeUpload->AddFormField("my_key", "Hello World");
	MimeUpload->AddFormField("another_key", "Great");

	// Take a screenshot
	FString RequestedScreenshotPath = FPaths::ScreenShotDir() / "my_screenshot.webp";
	FScreenshotRequest::RequestScreenshot(RequestedScreenshotPath, true, true);

	// Add a screenshot
	TArray<uint8> ScreenshotRawData;
	FFileHelper::LoadFileToArray(ScreenshotRawData, *FScreenshotRequest::GetFilename());
	MimeUpload->AddAttachment("screenshot_file", "upload_screenshot.webp", "image/png", ScreenshotRawData);

	// Add a zip
	const FString ZipFilePath = "Fill/This/In/my.zip";
	TArray<uint8> SaveZipRawData;
	FFileHelper::LoadFileToArray(SaveZipRawData, *ZipFilePath);
	MimeUpload->AddAttachment("zip_file", Filename, "application/zip", SaveZipRawData);

	// Send the request
	TSharedRef<IHttpRequest> HttpRequest = FHttpModule::Get().CreateRequest();
	const FString Url = "http://some.server.com";
	MimeUpload->SetupHttpRequest(HttpRequest, Url, RequestCompleteDelegate);
	HttpRequest->ProcessRequest();
}

void UBUIUploader::OnRequestComplete(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful)
{
	// Did it work or not?
	if (bWasSuccessful && Response.IsValid())
	{
		UE_LOG(LogTemp, Warning, TEXT("%s"), *Response->GetContentAsString());

		if (EHttpResponseCodes::IsOk(Response->GetResponseCode()))
		{
			// Yay we were successful!
		}
	}
}

🌈C++