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

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 was OK.

    # Wait until resolved and connected.
    while http.get_status() == HTTPClient.STATUS_CONNECTING or http.get_status() == HTTPClient.STATUS_RESOLVING:
        http.poll()
        print("Connecting...")
        OS.delay_msec(500)

    assert(http.get_status() == HTTPClient.STATUS_CONNECTED) # Could not connect

    # 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 not OS.has_feature("web"):
            OS.delay_msec(500)
        else:
            # Synchronous HTTP requests are not supported on the web,
            # so wait for the next main loop iteration.
            yield(Engine.get_main_loop(), "idle_frame")

    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()
            var chunk = http.read_response_body_chunk() # Get a chunk.
            if chunk.size() == 0:
                # Got nothing, wait for buffers to fill a bit.
                OS.delay_usec(1000)
            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()