Classe de client HTTP

HTTPClient offre un accès de bas niveau à la communication HTTP. Pour une interface de haut niveau, il vaut peut-être mieux se renseigner d’abord sur HTTPRequest, pour laquelle un tutorial est disponible ici.

Voici un exemple d’utilisation de la classe HTTPClient. C’est un simple script, qui peut donc être exécuté ainsi :

c:\godot> godot -s http_test.gd
c:\godot> godot -s HTTPTest.cs

Il va se connecter et récupérer un site web.

extends SceneTree

# HTTPClient demo
# This simple class can do HTTP requests; it will not block, but it needs to be polled.

func _init():
    var err = 0
    var http = HTTPClient.new() # Create the Client.

    err = http.connect_to_host("www.php.net", 80) # Connect to host/port.
    assert(err == OK) # Make sure connection is OK.

    # Wait until resolved and connected.
    while http.get_status() == HTTPClient.STATUS_CONNECTING or http.get_status() == HTTPClient.STATUS_RESOLVING:
        http.poll()
        print("Connecting...")
        if not OS.has_feature("web"):
            OS.delay_msec(500)
        else:
            yield(Engine.get_main_loop(), "idle_frame")

    assert(http.get_status() == HTTPClient.STATUS_CONNECTED) # Check if the connection was made successfully.

    # Some headers
    var headers = [
        "User-Agent: Pirulo/1.0 (Godot)",
        "Accept: */*"
    ]

    err = http.request(HTTPClient.METHOD_GET, "/ChangeLog-5.php", headers) # Request a page from the site (this one was chunked..)
    assert(err == OK) # Make sure all is OK.

    while http.get_status() == HTTPClient.STATUS_REQUESTING:
        # Keep polling for as long as the request is being processed.
        http.poll()
        print("Requesting...")
        if OS.has_feature("web"):
            # Synchronous HTTP requests are not supported on the web,
            # so wait for the next main loop iteration.
            yield(Engine.get_main_loop(), "idle_frame")
        else:
            OS.delay_msec(500)

    assert(http.get_status() == HTTPClient.STATUS_BODY or http.get_status() == HTTPClient.STATUS_CONNECTED) # Make sure request finished well.

    print("response? ", http.has_response()) # Site might not have a response.

    if http.has_response():
        # If there is a response...

        headers = http.get_response_headers_as_dictionary() # Get response headers.
        print("code: ", http.get_response_code()) # Show response code.
        print("**headers:\\n", headers) # Show headers.

        # Getting the HTTP Body

        if http.is_response_chunked():
            # Does it use chunks?
            print("Response is Chunked!")
        else:
            # Or just plain Content-Length
            var bl = http.get_response_body_length()
            print("Response Length: ", bl)

        # This method works for both anyway

        var rb = PoolByteArray() # Array that will hold the data.

        while http.get_status() == HTTPClient.STATUS_BODY:
            # While there is body left to be read
            http.poll()
            # Get a chunk.
            var chunk = http.read_response_body_chunk()
            if chunk.size() == 0:
                if not OS.has_feature("web"):
                    # Got nothing, wait for buffers to fill a bit.
                    OS.delay_usec(1000)
                else:
                    yield(Engine.get_main_loop(), "idle_frame")
            else:
                rb = rb + chunk # Append to read buffer.
        # Done!

        print("bytes got: ", rb.size())
        var text = rb.get_string_from_ascii()
        print("Text: ", text)

    quit()
class HTTPTest : SceneTree
{
    // HTTPClient demo.
    // This simple class can make HTTP requests; it will not block, but it needs to be polled.
    public override async void _Initialize()
    {
        Error err;
        HTTPClient http = new HTTPClient(); // Create the client.

        err = http.ConnectToHost("www.php.net", 80); // Connect to host/port.
        Debug.Assert(err == Error.Ok); // Make sure the connection is OK.

        // Wait until resolved and connected.
        while (http.GetStatus() == HTTPClient.Status.Connecting || http.GetStatus() == HTTPClient.Status.Resolving)
        {
            http.Poll();
            GD.Print("Connecting...");
            OS.DelayMsec(500);
        }

        Debug.Assert(http.GetStatus() == HTTPClient.Status.Connected); // Check if the connection was made successfully.

        // Some headers.
        string[] headers = { "User-Agent: Pirulo/1.0 (Godot)", "Accept: */*" };

        err = http.Request(HTTPClient.Method.Get, "/ChangeLog-5.php", headers); // Request a page from the site.
        Debug.Assert(err == Error.Ok); // Make sure all is OK.

        // Keep polling for as long as the request is being processed.
        while (http.GetStatus() == HTTPClient.Status.Requesting)
        {
            http.Poll();
            GD.Print("Requesting...");
            if (OS.HasFeature("web"))
            {
                // Synchronous HTTP requests are not supported on the web,
                // so wait for the next main loop iteration.
                await ToSignal(Engine.GetMainLoop(), "idle_frame");
            }
            else
            {
                OS.DelayMsec(500);
            }
        }

        Debug.Assert(http.GetStatus() == HTTPClient.Status.Body || http.GetStatus() == HTTPClient.Status.Connected); // Make sure the request finished well.

        GD.Print("Response? ", http.HasResponse()); // The site might not have a response.

        // If there is a response...
        if (http.HasResponse())
        {
            headers = http.GetResponseHeaders(); // Get response headers.
            GD.Print("Code: ", http.GetResponseCode()); // Show response code.
            GD.Print("Headers:");
            foreach (string header in headers)
            {
                // Show headers.
                GD.Print(header);
            }

            if (http.IsResponseChunked())
            {
                // Does it use chunks?
                GD.Print("Response is Chunked!");
            }
            else
            {
                // Or just Content-Length.
                GD.Print("Response Length: ", http.GetResponseBodyLength());
            }

            // This method works for both anyways.
            List<byte> rb = new List<byte>(); // List that will hold the data.

            // While there is data left to be read...
            while (http.GetStatus() == HTTPClient.Status.Body)
            {
                http.Poll();
                byte[] chunk = http.ReadResponseBodyChunk(); // Read a chunk.
                if (chunk.Length == 0)
                {
                    // If nothing was read, wait for the buffer to fill.
                    OS.DelayMsec(500);
                }
                else
                {
                    // Append the chunk to the read buffer.
                    rb.AddRange(chunk);
                }
            }

            // Done!
            GD.Print("Bytes Downloaded: ", rb.Count);
            string text = Encoding.ASCII.GetString(rb.ToArray());
            GD.Print(text);
        }
        Quit();
    }
}