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This addon makes HTTP requests much more convenient to use by introducing the await-syntax and removing the need for signals.

Calling an API:

extends AwaitableHTTPRequest

func _ready() -> void:
    var resp := await async_request("https://api.github.com/users/swarkin")

    if resp.success() and resp.status_ok():
        print(resp.status)                   # 200
        print(resp.headers["content-type"])  # application/json

        var json = resp.body_as_json()
        print(json["login"])                 # Swarkin

Downloading an image:

extends AwaitableHTTPRequest

func _ready() -> void:
    var bytes := await request_image()
    if bytes.is_empty(): return

    var path := OS.get_system_dir(OS.SYSTEM_DIR_DOWNLOADS)+"/image.png"
    var file := FileAccess.open(path, FileAccess.WRITE)
    if not file:
        push_error("Failed to open file.")
        return

    file.store_buffer(bytes)
    print("Downloaded and saved a random image to %s!" % path)

func request_image() -> PackedByteArray:
    var resp := await http.async_request("https://picsum.photos/256")
    if !resp.success() or resp.status_err():
        push_error("Request failed.")
        return PackedByteArray()

    return resp.bytes