roxy->use_authentication() ) {
			$headers .= $proxy->authentication_header() . "\r\n";
		}

		$headers .= "\r\n";

		if ( ! is_null( $parsed_args['body'] ) ) {
			$headers .= $parsed_args['body'];
		}

		fwrite( $handle, $headers );

		if ( ! $parsed_args['blocking'] ) {
			stream_set_blocking( $handle, 0 );
			fclose( $handle );
			return array(
				'headers'  => array(),
				'body'     => '',
				'response' => array(
					'code'    => false,
					'message' => false,
				),
				'cookies'  => array(),
			);
		}

		$response     = '';
		$body_started = false;
		$keep_reading = true;
		$block_size   = 4096;

		if ( isset( $parsed_args['limit_response_size'] ) ) {
			$block_size = min( $block_size, $parsed_args['limit_response_size'] );
		}

		// If streaming to a file setup the file handle.
		if ( $parsed_args['stream'] ) {
			if ( ! WP_DEBUG ) {
				$stream_handle = @fopen( $parsed_args['filename'], 'w+' );
			} else {
				$stream_handle = fopen( $parsed_args['filename'], 'w+' );
			}

			if ( ! $stream_handle ) {
				return new WP_Error(
					'http_request_failed',
					sprintf(
						/* translators: 1: fopen(), 2: File name. */
						__( 'Could not open handle for %1$s to %2$s.' ),
						'fopen()',
						$parsed_args['filename']
					)
				);
			}

			$bytes_written = 0;

			while ( ! feof( $handle ) && $keep_reading ) {
				$block = fread( $handle, $block_size );
				if ( ! $body_started ) {
					$response .= $block;
					if ( strpos( $response, "\r\n\r\n" ) ) {
						$processed_response = WP_Http::processResponse( $response );
						$body_started       = true;
						$block              = $processed_response['body'];
						unset( $response );
						$processed_response['body'] = '';
					}
				}

				$this_block_size = strlen( $block );

				if ( isset( $parsed_args['limit_response_size'] )
					&& ( $bytes_written + $this_block_size ) > $parsed_args['limit_response_size']
				) {
					$this_block_size = ( $parsed_args['limit_response_size'] - $bytes_written );
					$block           = substr( $block, 0, $this_block_size );
				}

				$bytes_written_to_file = fwrite( $stream_handle, $block );

				if ( $bytes_written_to_file !== $this_block_size ) {
					fclose( $handle );
					fclose( $stream_handle );
					return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );
				}

				$bytes_written += $bytes_written_to_file;

				$keep_reading = (
					! isset( $parsed_args['limit_response_size'] )
					|| $bytes_written < $parsed_args['limit_response_size']
				);
			}

			fclose( $stream_handle );

		} else {
			$header_length = 0;

			while ( ! feof( $handle ) && $keep_reading ) {
				$block     = fread( $handle, $block_size );
				$response .= $block;

				if ( ! $body_started && strpos( $response, "\r\n\r\n" ) ) {
					$header_length = strpos( $response, "\r\n\r\n" ) + 4;
					$body_started  = true;
				}

				$keep_reading = (
					! $body_started
					|| ! isset( $parsed_args['limit_response_size'] )
					|| strlen( $response ) < ( $header_length + $parsed_args['limit_response_size'] )
				);
			}

			$processed_response = WP_Http::processResponse( $response );
			unset( $response );

		}

		fclose( $handle );

		$processed_headers = WP_Http::processHeaders( $processed_response['headers'], $url );

		$response = array(
			'headers'  => $processed_headers['headers'],
			// Not yet processed.
			'body'     => null,
			'response' => $processed_headers['response'],
			'cookies'  => $processed_headers['cookies'],
			'filename' => $parsed_args['filename'],
		);

		// Handle redirects.
		$redirect_response = WP_Http::handle_redirects( $url, $parsed_args, $response );
		if ( false !== $redirect_response ) {
			return $redirect_response;
		}

		// If the body was chunk encoded, then decode it.
		if ( ! empty( $processed_response['body'] )
			&& isset( $processed_headers['headers']['transfer-encoding'] )
			&& 'chunked' === $processed_headers['headers']['transfer-encoding']
		) {
			$processed_response['body'] = WP_Http::chunkTransferDecode( $processed_response['body'] );
		}

		if ( true === $parsed_args['decompress']
			&& true === WP_Http_Encoding::should_decode( $processed_headers['headers'] )
		) {
			$processed_response['body'] = WP_Http_Encoding::decompress( $processed_response['body'] );
		}

		if ( isset( $parsed_args['limit_response_size'] )
			&& strlen( $processed_response['body'] ) > $parsed_args['limit_response_size']
		) {
			$processed_response['body'] = substr( $processed_response['body'], 0, $parsed_args['limit_response_size'] );
		}

		$response['body'] = $processed_response['body'];

		return $response;
	}

	/**
	 * Verifies the received SSL certificate against its Common Names and subjectAltName fields.
	 *
	 * PHP's SSL verifications only verify that it's a valid Certificate, it doesn't verify if
	 * the certificate is valid for the hostname which was requested.
	 * This function verifies the requested hostname against certificate's subjectAltName field,
	 * if that is empty, or contains no DNS entries, a fallback to the Common Name field is used.
	 *
	 * IP Address support is included if the request is being made to an IP address.
	 *
	 * @since 3.7.0
	 *
	 * @param resource $stream The PHP Stream which the SSL request is being made over
	 * @param string   $host   The hostname being requested
	 * @return bool If the certificate presented in $stream is valid for $host
	 */
	public static function verify_ssl_certificate( $stream, $host ) {
		$context_options = stream_context_get_options( $stream );

		if ( empty( $context_options['ssl']['peer_certificate'] ) ) {
			return false;
		}

		$cert = openssl_x509_parse( $context_options['ssl']['peer_certificate'] );
		if ( ! $cert ) {
			return false;
		}

		/*
		 * If the request is being made to an IP address, we'll validate against IP fields
		 * in the cert (if they exist)
		 */
		$host_type = ( WP_Http::is_ip_address( $host ) ? 'ip' : 'dns' );

		$certificate_hostnames = array();
		if ( ! empty( $cert['extensions']['subjectAltName'] ) ) {
			$match_against = preg_split( '/,\s*/', $cert['extensions']['subjectAltName'] );
			foreach ( $match_against as $match ) {
				list( $match_type, $match_host ) = explode( ':', $match );
				if ( strtolower( trim( $match_type ) ) === $host_type ) { // IP: or DNS:
					$certificate_hostnames[] = strtolower( trim( $match_host ) );
				}
			}
		} elseif ( ! empty( $cert['subject']['CN'] ) ) {
			// Only use the CN when the certificate includes no subjectAltName extension.
			$certificate_hostnames[] = strtolower( $cert['subject']['CN'] );
		}

		// Exact hostname/IP matches.
		if ( in_array( strtolower( $host ), $certificate_hostnames, true ) ) {
			return true;
		}

		// IP's can't be wildcards, Stop processing.
		if ( 'ip' === $host_type ) {
			return false;
		}

		// Test to see if the domain is at least 2 deep for wildcard support.
		if ( substr_count( $host, '.' ) < 2 ) {
			return false;
		}

		// Wildcard subdomains certs (*.example.com) are valid for a.example.com but not a.b.example.com.
		$wildcard_host = preg_replace( '/^[^.]+\./', '*.', $host );

		return in_array( strtolower( $wildcard_host ), $certificate_hostnames, true );
	}

	/**
	 * Determines whether this class can be used for retrieving a URL.
	 *
	 * @since 2.7.0
	 * @since 3.7.0 Combined with the fsockopen transport and switched to stream_socket_client().
	 *
	 * @param array $args Optional. Array of request arguments. Default empty array.
	 * @return bool False means this class can not be used, true means it can.
	 */
	public static function test( $args = array() ) {
		if ( ! function_exists( 'stream_socket_client' ) ) {
			return false;
		}

		$is_ssl = isset( $args['ssl'] ) && $args['ssl'];

		if ( $is_ssl ) {
			if ( ! extension_loaded( 'openssl' ) ) {
				return false;
			}
			if ( ! function_exists( 'openssl_x509_parse' ) ) {
				return false;
			}
		}

		/**
		 * Filters whether streams can be used as a transport for retrieving a URL.
		 *
		 * @since 2.7.0
		 *
		 * @param bool  $use_class Whether the class can be used. Default true.
		 * @param array $args      Request arguments.
		 */
		return apply_filters( 'use_streams_transport', true, $args );
	}
}

/**
 * Deprecated HTTP Transport method which used fsockopen.
 *
 * This class is not used, and is included for backward compatibility only.
 * All code should make use of WP_Http directly through its API.
 *
 * @see WP_HTTP::request
 *
 * @since 2.7.0
 * @deprecated 3.7.0 Please use WP_HTTP::request() directly
 */
class WP_HTTP_Fsockopen extends WP_Http_Streams {
	// For backward compatibility for users who are using the class directly.
}
             => $order->get_status(),
			'order_key'          => $order->get_order_key(),
			'order_number'       => $order->get_order_number(),
			'customer_note'      => $order->get_customer_note(),
			'customer_id'        => $order->get_customer_id(),
			'billing_address'    => (object) $this->billing_address_schema->get_item_response( $order ),
			'shipping_address'   => (object) $this->shipping_address_schema->get_item_response( $order ),
			'payment_method'     => $order->get_payment_method(),
			'payment_result'     => $payment_result,
			'additional_fields'  => (object) $this->get_additional_fields_response( $order ),
			'__experimentalCart' => $cart ? (object) $this->cart_schema->get_item_response( $cart ) : null,
			self::EXTENDING_KEY  => $this->get_extended_data( self::IDENTIFIER ),
		];
	}

	/**
	 * This prepares the payment details for the response so it's following the
	 * schema where it's an array of objects.
	 *
	 * @param array $payment_details An array of payment details from the processed payment.
	 *
	 * @return array An array of objects where each object has the key and value
	 *               as distinct properties.
	 */
	protected function prepare_payment_details_for_response( array $payment_details ) {
		return array_map(
			function ( $key, $value ) {
				return (object) [
					'key'   => $key,
					'value' => $value,
				];
			},
			array_keys( $payment_details ),
			$payment_details
		);
	}

	/**
	 * Get the additional fields response.
	 *
	 * @param \WC_Order $order Order object.
	 * @return array
	 */
	protected function get_additional_fields_response( \WC_Order $order ) {
		$fields = wp_parse_args(
			$this->additional_fields_controller->get_all_fields_from_object( $order, 'other' ),
			$this->additional_fields_controller->get_all_fields_from_object( wc()->customer, 'other' )
		);

		$additional_field_schema = $this->get_additional_fields_schema();
		foreach ( $fields as $key => $value ) {
			if ( ! isset( $additional_field_schema[ $key ] ) ) {
				unset( $fields[ $key ] );
				continue;
			}
			// This makes sure we're casting checkboxes from "1" and "0" to boolean. In the frontend, "0" is treated as truthy.
			if ( isset( $additional_field_schema[ $key ]['type'] ) && 'boolean' === $additional_field_schema[ $key ]['type'] ) {
				$fields[ $key ] = (bool) $value;
			} else {
				$fields[ $key ] = $this->prepare_html_response( $value );
			}
		}

		return (object) $fields;
	}

	/**
	 * Get the schema for additional fields.
	 *
	 * @return array
	 */
	protected function get_additional_fields_schema() {
		return $this->generate_additional_fields_schema(
			$this->additional_fields_controller->get_fields_for_location( 'contact' ),
			$this->additional_fields_controller->get_fields_for_location( 'order' )
		);
	}

	/**
	 * Generate the schema for additional fields.
	 *
	 * @param array[] ...$args One or more arrays of additional fields.
	 * @return array
	 */
	protected function generate_additional_fields_schema( ...$args ) {
		$additional_fields = array_merge( ...$args );
		$schema            = [];
		foreach ( $additional_fields as $key => $field ) {
			$field_schema = [
				'description' => $field['label'],
				'type'        => 'string',
				'context'     => [ 'view', 'edit' ],
				'required'    => $this->additional_fields_controller->is_conditional_field( $field ) ? false : true === $field['required'],
			];

			if ( 'select' === $field['type'] ) {
				$field_schema['enum'] = array_map(
					function ( $option ) {
						return $option['value'];
					},
					$field['options']
				);
				if ( true !== $field['required'] || $this->additional_fields_controller->is_conditional_field( $field ) ) {
					$field_schema['enum'][] = '';
				}
			}

			if ( 'checkbox' === $field['type'] ) {
				$field_schema['type'] = 'boolean';
			}

			if ( 'checkbox' === $field['type'] && true === $field['required'] ) {
				$field_schema['enum'][] = true;
			}

			$schema[ $key ] = $field_schema;
		}
		return $schema;
	}

	/**
	 * Check if any additional field is required, so that the parent item is required as well.
	 *
	 * @param array $additional_fields_schema Additional fields schema.
	 * @return bool
	 */
	protected function schema_has_required_property( $additional_fields_schema ) {
		return array_reduce(
			array_keys( $additional_fields_schema ),
			function ( $carry, $key ) use ( $additional_fields_schema ) {
				return $carry || true === $additional_fields_schema[ $key ]['required'];
			},
			false
		);
	}

	/**
	 * Sanitize and format additional fields object.
	 *
	 * @param array $fields Values being sanitized.
	 * @return array
	 */
	public function sanitize_additional_fields( $fields ) {
		$properties         = $this->get_additional_fields_schema();
		$sanitization_utils = new SanitizationUtils();
		$fields             = $sanitization_utils->wp_kses_array(
			array_reduce(
				array_keys( $fields ),
				function ( $carry, $key ) use ( $fields, $properties ) {
					if ( ! isset( $properties[ $key ] ) ) {
						return $carry;
					}
					$field_schema   = $properties[ $key ];
					$rest_sanitized = rest_sanitize_value_from_schema( wp_unslash( $fields[ $key ] ), $field_schema, $key );
					$rest_sanitized = $this->additional_fields_controller->sanitize_field( $key, $rest_sanitized );
					$carry[ $key ]  = $rest_sanitized;
					return $carry;
				},
				[]
			)
		);

		return $sanitization_utils->wp_kses_array( $fields );
	}

	/**
	 * Validate additional fields object. This does not validate required fields nor customer validation rules because
	 * this may be a partial request. That will happen later when the full request is processed during POST. This only
	 * validates against the schema.
	 *
	 * @see rest_validate_value_from_schema
	 *
	 * @param array            $fields Value being sanitized.
	 * @param \WP_REST_Request $request The Request.
	 * @return true|\WP_Error
	 */
	public function validate_additional_fields( $fields, $request ) {
		$errors                  = new \WP_Error();
		$fields                  = $this->sanitize_additional_fields( $fields );
		$additional_field_schema = $this->get_additional_fields_schema();

		// for PUT requests, we only want to validate the fields that are being updated.
		if ( $request->get_method() === 'PUT' ) {
			$additional_field_schema = array_intersect_key( $additional_field_schema, $fields );
		}

		// on POST, loop over the schema instead of the fields. This is to ensure missing fields are validated.
		foreach ( $additional_field_schema as $key => $schema ) {
			if ( ! isset( $fields[ $key ] ) && true !== $schema['required'] ) {
				// Optional fields can go missing.
				continue;
			}

			$result = rest_validate_value_from_schema( $fields[ $key ] ?? null, $schema, $key );

			if ( is_wp_error( $result ) && $result->has_errors() ) {
				$location = $this->additional_fields_controller->get_field_location( $key );
				foreach ( $result->get_error_codes() as $code ) {
					$result->add_data(
						array(
							'location' => $location,
							'key'      => $key,
						),
						$code
					);
				}
				$errors->merge_from( $result );
			}
		}

		return $errors->has_errors() ? $errors : true;
	}
}