This is a C# wrapper for Unity to use libcurl with http/2 and openssl enabled.

• Windows x64
• macOS 64bit
• iOS arm64
• Android armv7/arm64/x86

• CMake is required for all platforms.
• NDK r16b is required for Android.
• Xcode is required for macOS/iOS.
• Visual Studio 2017 is required for Windows.

There are several build script under build folder for each platform:

All the scripts will auto deloy the output files into Assets/curl-unity/Plugins.

Build libcurl.so for Android. Please use this script on macOS but it should also works on Linux.

Build libcurl.a for iOS. Please use this script on macOS

Build curl.bundle for macOS. Please use this script on macOS.

Build curl.dll for Windows. Please use this script on Windows.

Copy Assets/curl-unity to anywhere under your Unity project and done.

For a better performance you could enable Allow unsafe code and add ALLOW_UNSAFE to the Scripting Define Symbols in the project settings.

A CurlMultiUpdater component is needed to be created before any request and then you could check multiThread on or not.

Only by using this multi perform that could take the advantage of HTTP/2 multiplexing feature.

void Start()
{
    for (int i = 0; i < 5; i++)
    {
        var easy = new CurlEasy();
        easy.url = "https://nghttp2.org";
        easy.timeout = 5000;
        // NOTICE: This callback may be invoked on other thread
        easy.performCallback = OnPerformCallback;

        // You could also create your own CurlMulti instance
        easy.MultiPerform(CurlMulti.DefaultMulti);
    }
}

void OnPerformCallback(CURLE result, CurlEasy easy)
{
    if (result == CURLE.OK)
    {
        Debug.Log(easy.inText);
    }
}

Not recommended. You should take care of the thread safe issues and it can't be canceled before done.

async void Start()
{
    var easy = new CurlEasy();
    easy.url = "https://nghttp2.org";
    easy.timeout = 5000;
    if (await easy.PerformAsync() == CURLE.OK)
    {
        Debug.Log(easy.inText);
    }
}

void Start()
{
    var easy = new CurlEasy();
    easy.url = "https://nghttp2.org";
    easy.timeout = 5000;
    if (easy.Perform() == CURLE.OK)
    {
        Debug.Log(easy.inText);
    }
}