pandemonium_engine/doc/classes/HTTPRequest.xml

<?xml version="1.0" encoding="UTF-8" ?>
<class name="HTTPRequest" inherits="Node" version="4.1">
	<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]
		[codeblock]
		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 = to_json({"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"])
		[/codeblock]
		[b]Example of loading and displaying an image using HTTPRequest:[/b]
		[codeblock]
		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):
		    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
		[/codeblock]
	</description>
	<tutorials>
		<link>$DOCS_URL/tutorials/networking/http_request_class.html</link>
		<link>$DOCS_URL/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="PoolStringArray" default="PoolStringArray(  )" />
			<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] When [code]method[/code] is [constant HTTPClient.METHOD_GET], the payload sent via [code]request_data[/code] might be ignored by the server or even cause the server to reject the request (check [url=https://datatracker.ietf.org/doc/html/rfc7231#section-4.3.1]RFC 7231 section 4.3.1[/url] for more details). As a workaround, you can send data as a query string in the URL. See [method String.http_escape] 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="PoolStringArray" default="PoolStringArray(  )" />
			<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="PoolByteArray" default="PoolByteArray(  )" />
			<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>
		<method name="set_http_proxy">
			<return type="void" />
			<argument index="0" name="host" type="String" />
			<argument index="1" name="port" type="int" />
			<description>
				Sets the proxy server for HTTP requests.
				The proxy server is unset if [code]host[/code] is empty or [code]port[/code] is -1.
			</description>
		</method>
		<method name="set_https_proxy">
			<return type="void" />
			<argument index="0" name="host" type="String" />
			<argument index="1" name="port" type="int" />
			<description>
				Sets the proxy server for HTTPS requests.
				The proxy server is unset if [code]host[/code] is empty or [code]port[/code] is -1.
			</description>
		</method>
	</methods>
	<members>
		<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 ([code]-1[/code] means no limit). When only small files are expected, this can be used to prevent disallow receiving files that are too large, preventing potential denial of service attacks.
		</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. If set to a non-empty string, the request output will be written to the file located at the path. If a file already exists at the specified location, it will be overwritten as soon as body data begins to be received.
			[b]Note:[/b] Folders are not automatically created when the file is created. If [member download_file] points to a subfolder, it's recommended to create the necessary folders beforehand using [method Directory.make_dir_recursive] to ensure the file can be written.
		</member>
		<member name="max_redirects" type="int" setter="set_max_redirects" getter="get_max_redirects" default="8">
			Maximum number of allowed redirects. This is used to prevent endless redirect loops.
		</member>
		<member name="timeout" type="float" setter="set_timeout" getter="get_timeout" default="0.0">
			If set to a value greater than [code]0.0[/code] before the request starts, the HTTP request will time out after [code]timeout[/code] seconds have passed and the request is not [i]completed[/i] yet. For small HTTP requests such as REST API usage, set [member timeout] to a value between [code]10.0[/code] and [code]30.0[/code] to prevent the application from getting stuck if the request fails to get a response in a timely manner. For file downloads, leave this to [code]0.0[/code] to prevent the download from failing if it takes too much time.
		</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="PoolStringArray" />
			<argument index="3" name="body" type="PoolByteArray" />
			<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_REQUEST_FAILED" value="8" enum="Result">
			Request failed (currently unused).
		</constant>
		<constant name="RESULT_DOWNLOAD_FILE_CANT_OPEN" value="9" enum="Result">
			HTTPRequest couldn't open the download file.
		</constant>
		<constant name="RESULT_DOWNLOAD_FILE_WRITE_ERROR" value="10" enum="Result">
			HTTPRequest couldn't write to the download file.
		</constant>
		<constant name="RESULT_REDIRECT_LIMIT_REACHED" value="11" enum="Result">
			Request reached its maximum redirect limit, see [member max_redirects].
		</constant>
		<constant name="RESULT_TIMEOUT" value="12" enum="Result">
		</constant>
	</constants>
</class>