godot/doc/classes/HTTPRequest.xml

<?xml version="1.0" encoding="UTF-8" ?>
<class name="HTTPRequest" inherits="Node" version="4.0">
	<brief_description>
		A node with the ability to send HTTP(S) requests.
	</brief_description>
	<description>
		A node with the ability to send HTTP requests. Uses [HTTPClient] internally.
		Can be used to make HTTP requests, i.e. download or upload files or web content via HTTP.
		[b]Warning:[/b] See the notes and warnings on [HTTPClient] for limitations, especially regarding SSL security.
		[b]Example of contacting a REST API and printing one of its returned fields:[/b]
		[codeblocks]
		[gdscript]
		func _ready():
		    # Create an HTTP request node and connect its completion signal.
		    var http_request = HTTPRequest.new()
		    add_child(http_request)
		    http_request.connect("request_completed", self, "_http_request_completed")

		    # Perform a GET request. The URL below returns JSON as of writing.
		    var error = http_request.request("https://httpbin.org/get")
		    if error != OK:
		        push_error("An error occurred in the HTTP request.")

		    # Perform a POST request. The URL below returns JSON as of writing.
		    # Note: Don't make simultaneous requests using a single HTTPRequest node.
		    # The snippet below is provided for reference only.
		    var body = {"name": "Godette"}
		    error = http_request.request("https://httpbin.org/post", [], true, HTTPClient.METHOD_POST, body)
		    if error != OK:
		        push_error("An error occurred in the HTTP request.")


		# Called when the HTTP request is completed.
		func _http_request_completed(result, response_code, headers, body):
		    var response = parse_json(body.get_string_from_utf8())

		    # Will print the user agent string used by the HTTPRequest node (as recognized by httpbin.org).
		    print(response.headers["User-Agent"])
		[/gdscript]
		[csharp]
		public override void _Ready()
		{
		    // Create an HTTP request node and connect its completion signal.
		    var httpRequest = new HTTPRequest();
		    AddChild(httpRequest);
		    httpRequest.Connect("request_completed", this, nameof(HttpRequestCompleted));

		    // Perform a GET request. The URL below returns JSON as of writing.
		    Error error = httpRequest.Request("https://httpbin.org/get");
		    if (error != Error.Ok)
		    {
		        GD.PushError("An error occurred in the HTTP request.");
		    }

		    // Perform a POST request. The URL below returns JSON as of writing.
		    // Note: Don't make simultaneous requests using a single HTTPRequest node.
		    // The snippet below is provided for reference only.
		    string[] body = { "name", "Godette" };
		    // GDScript to_json is non existent, so we use JSON.Print() here.
		    error = httpRequest.Request("https://httpbin.org/post", null, true, HTTPClient.Method.Post, JSON.Print(body));
		    if (error != Error.Ok)
		    {
		        GD.PushError("An error occurred in the HTTP request.");
		    }
		}


		// Called when the HTTP request is completed.
		private void HttpRequestCompleted(int result, int response_code, string[] headers, byte[] body)
		{
		    // GDScript parse_json is non existent so we have to use JSON.parse, which has a slightly different syntax.
		    var response = JSON.Parse(body.GetStringFromUTF8()).Result as Godot.Collections.Dictionary;
		    // Will print the user agent string used by the HTTPRequest node (as recognized by httpbin.org).
		    GD.Print((response["headers"] as Godot.Collections.Dictionary)["User-Agent"]);
		}
		[/csharp]
		[/codeblocks]
		[b]Example of loading and displaying an image using HTTPRequest:[/b]
		[codeblocks]
		[gdscript]
		func _ready():
		    # Create an HTTP request node and connect its completion signal.
		    var http_request = HTTPRequest.new()
		    add_child(http_request)
		    http_request.connect("request_completed", self, "_http_request_completed")

		    # Perform the HTTP request. The URL below returns a PNG image as of writing.
		    var error = http_request.request("https://via.placeholder.com/512")
		    if error != OK:
		        push_error("An error occurred in the HTTP request.")


		# Called when the HTTP request is completed.
		func _http_request_completed(result, response_code, headers, body):
		    if result != HTTPRequest.RESULT_SUCCESS:
		        push_error("Image couldn't be downloaded. Try a different image.")

		    var image = Image.new()
		    var error = image.load_png_from_buffer(body)
		    if error != OK:
		        push_error("Couldn't load the image.")

		    var texture = ImageTexture.new()
		    texture.create_from_image(image)

		    # Display the image in a TextureRect node.
		    var texture_rect = TextureRect.new()
		    add_child(texture_rect)
		    texture_rect.texture = texture
		[/gdscript]
		[csharp]
		public override void _Ready()
		{
		    // Create an HTTP request node and connect its completion signal.
		    var httpRequest = new HTTPRequest();
		    AddChild(httpRequest);
		    httpRequest.Connect("request_completed", this, nameof(HttpRequestCompleted));

		    // Perform the HTTP request. The URL below returns a PNG image as of writing.
		    Error error = httpRequest.Request("https://via.placeholder.com/512");
		    if (error != Error.Ok)
		    {
		        GD.PushError("An error occurred in the HTTP request.");
		    }
		}


		// Called when the HTTP request is completed.
		private void HttpRequestCompleted(int result, int response_code, string[] headers, byte[] body)
		{
		    if (result != (int)HTTPRequest.Result.Success)
		    {
		        GD.PushError("Image couldn't be downloaded. Try a different image.");
		    }
		    var image = new Image();
		    Error error = image.LoadPngFromBuffer(body);
		    if (error != Error.Ok)
		    {
		        GD.PushError("Couldn't load the image.");
		    }

		    var texture = new ImageTexture();
		    texture.CreateFromImage(image);

		    // Display the image in a TextureRect node.
		    var textureRect = new TextureRect();
		    AddChild(textureRect);
		    textureRect.Texture = texture;
		}
		[/csharp]
		[/codeblocks]

		[b]Gzipped response bodies[/b]: HTTPRequest will automatically handle decompression of response bodies. A [code]Accept-Encoding[/code] header will be automatically added to each of your requests, unless one is already specified. Any response with a [code]Content-Encoding: gzip[/code] header will automatically be decompressed and delivered to you as uncompressed bytes.
	</description>
	<tutorials>
		<link title="Making HTTP requests">https://docs.godotengine.org/en/latest/tutorials/networking/http_request_class.html</link>
		<link title="SSL certificates">https://docs.godotengine.org/en/latest/tutorials/networking/ssl_certificates.html</link>
	</tutorials>
	<methods>
		<method name="cancel_request">
			<return type="void" />
			<description>
				Cancels the current request.
			</description>
		</method>
		<method name="get_body_size" qualifiers="const">
			<return type="int" />
			<description>
				Returns the response body length.
				[b]Note:[/b] Some Web servers may not send a body length. In this case, the value returned will be [code]-1[/code]. If using chunked transfer encoding, the body length will also be [code]-1[/code].
			</description>
		</method>
		<method name="get_downloaded_bytes" qualifiers="const">
			<return type="int" />
			<description>
				Returns the amount of bytes this HTTPRequest downloaded.
			</description>
		</method>
		<method name="get_http_client_status" qualifiers="const">
			<return type="int" enum="HTTPClient.Status" />
			<description>
				Returns the current status of the underlying [HTTPClient]. See [enum HTTPClient.Status].
			</description>
		</method>
		<method name="request">
			<return type="int" enum="Error" />
			<argument index="0" name="url" type="String" />
			<argument index="1" name="custom_headers" type="PackedStringArray" default="PackedStringArray()" />
			<argument index="2" name="ssl_validate_domain" type="bool" default="true" />
			<argument index="3" name="method" type="int" enum="HTTPClient.Method" default="0" />
			<argument index="4" name="request_data" type="String" default="&quot;&quot;" />
			<description>
				Creates request on the underlying [HTTPClient]. If there is no configuration errors, it tries to connect using [method HTTPClient.connect_to_host] and passes parameters onto [method HTTPClient.request].
				Returns [constant OK] if request is successfully created. (Does not imply that the server has responded), [constant ERR_UNCONFIGURED] if not in the tree, [constant ERR_BUSY] if still processing previous request, [constant ERR_INVALID_PARAMETER] if given string is not a valid URL format, or [constant ERR_CANT_CONNECT] if not using thread and the [HTTPClient] cannot connect to host.
				[b]Note:[/b] The [code]request_data[/code] parameter is ignored if [code]method[/code] is [constant HTTPClient.METHOD_GET]. This is because GET methods can't contain request data. As a workaround, you can pass request data as a query string in the URL. See [method String.uri_encode] for an example.
			</description>
		</method>
		<method name="request_raw">
			<return type="int" enum="Error" />
			<argument index="0" name="url" type="String" />
			<argument index="1" name="custom_headers" type="PackedStringArray" default="PackedStringArray()" />
			<argument index="2" name="ssl_validate_domain" type="bool" default="true" />
			<argument index="3" name="method" type="int" enum="HTTPClient.Method" default="0" />
			<argument index="4" name="request_data_raw" type="PackedByteArray" default="PackedByteArray()" />
			<description>
				Creates request on the underlying [HTTPClient] using a raw array of bytes for the request body. If there is no configuration errors, it tries to connect using [method HTTPClient.connect_to_host] and passes parameters onto [method HTTPClient.request].
				Returns [constant OK] if request is successfully created. (Does not imply that the server has responded), [constant ERR_UNCONFIGURED] if not in the tree, [constant ERR_BUSY] if still processing previous request, [constant ERR_INVALID_PARAMETER] if given string is not a valid URL format, or [constant ERR_CANT_CONNECT] if not using thread and the [HTTPClient] cannot connect to host.
			</description>
		</method>
	</methods>
	<members>
		<member name="accept_gzip" type="bool" setter="set_accept_gzip" getter="is_accepting_gzip" default="true">
			If [code]true[/code], this header will be added to each request: [code]Accept-Encoding: gzip, deflate[/code] telling servers that it's okay to compress response bodies.
			Any Response body declaring a [code]Content-Encoding[/code] of either [code]gzip[/code] or [code]deflate[/code] will then be automatically decompressed, and the uncompressed bytes will be delivered via [code]request_completed[/code].
			If the user has specified their own [code]Accept-Encoding[/code] header, then no header will be added regardless of [code]accept_gzip[/code].
			If [code]false[/code] no header will be added, and no decompression will be performed on response bodies. The raw bytes of the response body will be returned via [code]request_completed[/code].
		</member>
		<member name="body_size_limit" type="int" setter="set_body_size_limit" getter="get_body_size_limit" default="-1">
			Maximum allowed size for response bodies. If the response body is compressed, this will be used as the maximum allowed size for the decompressed body.
		</member>
		<member name="download_chunk_size" type="int" setter="set_download_chunk_size" getter="get_download_chunk_size" default="65536">
			The size of the buffer used and maximum bytes to read per iteration. See [member HTTPClient.read_chunk_size].
			Set this to a lower value (e.g. 4096 for 4 KiB) when downloading small files to decrease memory usage at the cost of download speeds.
		</member>
		<member name="download_file" type="String" setter="set_download_file" getter="get_download_file" default="&quot;&quot;">
			The file to download into. Will output any received file into it.
		</member>
		<member name="max_redirects" type="int" setter="set_max_redirects" getter="get_max_redirects" default="8">
			Maximum number of allowed redirects.
		</member>
		<member name="timeout" type="int" setter="set_timeout" getter="get_timeout" default="0">
		</member>
		<member name="use_threads" type="bool" setter="set_use_threads" getter="is_using_threads" default="false">
			If [code]true[/code], multithreading is used to improve performance.
		</member>
	</members>
	<signals>
		<signal name="request_completed">
			<argument index="0" name="result" type="int" />
			<argument index="1" name="response_code" type="int" />
			<argument index="2" name="headers" type="PackedStringArray" />
			<argument index="3" name="body" type="PackedByteArray" />
			<description>
				Emitted when a request is completed.
			</description>
		</signal>
	</signals>
	<constants>
		<constant name="RESULT_SUCCESS" value="0" enum="Result">
			Request successful.
		</constant>
		<constant name="RESULT_CHUNKED_BODY_SIZE_MISMATCH" value="1" enum="Result">
		</constant>
		<constant name="RESULT_CANT_CONNECT" value="2" enum="Result">
			Request failed while connecting.
		</constant>
		<constant name="RESULT_CANT_RESOLVE" value="3" enum="Result">
			Request failed while resolving.
		</constant>
		<constant name="RESULT_CONNECTION_ERROR" value="4" enum="Result">
			Request failed due to connection (read/write) error.
		</constant>
		<constant name="RESULT_SSL_HANDSHAKE_ERROR" value="5" enum="Result">
			Request failed on SSL handshake.
		</constant>
		<constant name="RESULT_NO_RESPONSE" value="6" enum="Result">
			Request does not have a response (yet).
		</constant>
		<constant name="RESULT_BODY_SIZE_LIMIT_EXCEEDED" value="7" enum="Result">
			Request exceeded its maximum size limit, see [member body_size_limit].
		</constant>
		<constant name="RESULT_BODY_DECOMPRESS_FAILED" value="8" enum="Result">
		</constant>
		<constant name="RESULT_REQUEST_FAILED" value="9" enum="Result">
			Request failed (currently unused).
		</constant>
		<constant name="RESULT_DOWNLOAD_FILE_CANT_OPEN" value="10" enum="Result">
			HTTPRequest couldn't open the download file.
		</constant>
		<constant name="RESULT_DOWNLOAD_FILE_WRITE_ERROR" value="11" enum="Result">
			HTTPRequest couldn't write to the download file.
		</constant>
		<constant name="RESULT_REDIRECT_LIMIT_REACHED" value="12" enum="Result">
			Request reached its maximum redirect limit, see [member max_redirects].
		</constant>
		<constant name="RESULT_TIMEOUT" value="13" enum="Result">
		</constant>
	</constants>
</class>