<?php

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/**

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* HTTP API: WP_Http_Curl class

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*

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* @package WordPress

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* @subpackage HTTP

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* @since 4.4.0

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*/

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/**

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* Core class used to integrate Curl as an HTTP transport.

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*

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* HTTP request method uses Curl extension to retrieve the url.

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*

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* Requires the Curl extension to be installed.

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*

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* @since 2.7.0

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* @deprecated 6.4.0 Use WP_Http

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* @see WP_Http

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*/

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#[AllowDynamicProperties]

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class WP_Http_Curl {

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/**

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* Temporary header storage for during requests.

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*

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* @since 3.2.0

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* @var string

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*/

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private $headers = '';

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/**

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* Temporary body storage for during requests.

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*

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* @since 3.6.0

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* @var string

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*/

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private $body = '';

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/**

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* The maximum amount of data to receive from the remote server.

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*

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* @since 3.6.0

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* @var int|false

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*/

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private $max_body_length = false;

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/**

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* The file resource used for streaming to file.

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*

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* @since 3.6.0

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* @var resource|false

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*/

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private $stream_handle = false;

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/**

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* The total bytes written in the current request.

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*

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* @since 4.1.0

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* @var int

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*/

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private $bytes_written_total = 0;

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/**

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* Send a HTTP request to a URI using cURL extension.

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*

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* @since 2.7.0

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*

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* @param string $url The request URL.

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* @param string|array $args Optional. Override the defaults.

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* @return array|WP_Error Array containing 'headers', 'body', 'response', 'cookies', 'filename'. A WP_Error instance upon error

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*/

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public function request( $url, $args = array() ) {

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$defaults = array(

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'method' => 'GET',

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'timeout' => 5,

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'redirection' => 5,

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'httpversion' => '1.0',

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'blocking' => true,

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'headers' => array(),

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'body' => null,

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'cookies' => array(),

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'decompress' => false,

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'stream' => false,

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'filename' => null,

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);

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$parsed_args = wp_parse_args( $args, $defaults );

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if ( isset( $parsed_args['headers']['User-Agent'] ) ) {

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$parsed_args['user-agent'] = $parsed_args['headers']['User-Agent'];

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unset( $parsed_args['headers']['User-Agent'] );

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} elseif ( isset( $parsed_args['headers']['user-agent'] ) ) {

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$parsed_args['user-agent'] = $parsed_args['headers']['user-agent'];

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unset( $parsed_args['headers']['user-agent'] );

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}

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// Construct Cookie: header if any cookies are set.

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WP_Http::buildCookieHeader( $parsed_args );

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$handle = curl_init();

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// cURL offers really easy proxy support.

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$proxy = new WP_HTTP_Proxy();

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if ( $proxy->is_enabled() && $proxy->send_through_proxy( $url ) ) {

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curl_setopt( $handle, CURLOPT_PROXYTYPE, CURLPROXY_HTTP );

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curl_setopt( $handle, CURLOPT_PROXY, $proxy->host() );

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curl_setopt( $handle, CURLOPT_PROXYPORT, $proxy->port() );

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if ( $proxy->use_authentication() ) {

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curl_setopt( $handle, CURLOPT_PROXYAUTH, CURLAUTH_ANY );

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curl_setopt( $handle, CURLOPT_PROXYUSERPWD, $proxy->authentication() );

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}

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}

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$is_local = isset( $parsed_args['local'] ) && $parsed_args['local'];

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$ssl_verify = isset( $parsed_args['sslverify'] ) && $parsed_args['sslverify'];

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if ( $is_local ) {

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/** This filter is documented in wp-includes/class-wp-http-streams.php */

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$ssl_verify = apply_filters( 'https_local_ssl_verify', $ssl_verify, $url );

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} elseif ( ! $is_local ) {

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/** This filter is documented in wp-includes/class-wp-http.php */

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$ssl_verify = apply_filters( 'https_ssl_verify', $ssl_verify, $url );

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}

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/*

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* CURLOPT_TIMEOUT and CURLOPT_CONNECTTIMEOUT expect integers. Have to use ceil since.

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* a value of 0 will allow an unlimited timeout.

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*/

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$timeout = (int) ceil( $parsed_args['timeout'] );

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curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, $timeout );

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curl_setopt( $handle, CURLOPT_TIMEOUT, $timeout );

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curl_setopt( $handle, CURLOPT_URL, $url );

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curl_setopt( $handle, CURLOPT_RETURNTRANSFER, true );

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curl_setopt( $handle, CURLOPT_SSL_VERIFYHOST, ( true === $ssl_verify ) ? 2 : false );

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curl_setopt( $handle, CURLOPT_SSL_VERIFYPEER, $ssl_verify );

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if ( $ssl_verify ) {

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curl_setopt( $handle, CURLOPT_CAINFO, $parsed_args['sslcertificates'] );

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}

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curl_setopt( $handle, CURLOPT_USERAGENT, $parsed_args['user-agent'] );

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/*

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* The option doesn't work with safe mode or when open_basedir is set, and there's

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* a bug #17490 with redirected POST requests, so handle redirections outside Curl.

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*/

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curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, false );

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curl_setopt( $handle, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS );

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switch ( $parsed_args['method'] ) {

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case 'HEAD':

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curl_setopt( $handle, CURLOPT_NOBODY, true );

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break;

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case 'POST':

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curl_setopt( $handle, CURLOPT_POST, true );

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curl_setopt( $handle, CURLOPT_POSTFIELDS, $parsed_args['body'] );

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break;

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case 'PUT':

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curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, 'PUT' );

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curl_setopt( $handle, CURLOPT_POSTFIELDS, $parsed_args['body'] );

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break;

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default:

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curl_setopt( $handle, CURLOPT_CUSTOMREQUEST, $parsed_args['method'] );

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if ( ! is_null( $parsed_args['body'] ) ) {

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curl_setopt( $handle, CURLOPT_POSTFIELDS, $parsed_args['body'] );

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}

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break;

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}

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if ( true === $parsed_args['blocking'] ) {

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curl_setopt( $handle, CURLOPT_HEADERFUNCTION, array( $this, 'stream_headers' ) );

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curl_setopt( $handle, CURLOPT_WRITEFUNCTION, array( $this, 'stream_body' ) );

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}

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curl_setopt( $handle, CURLOPT_HEADER, false );

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if ( isset( $parsed_args['limit_response_size'] ) ) {

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$this->max_body_length = (int) $parsed_args['limit_response_size'];

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} else {

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$this->max_body_length = false;

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}

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// If streaming to a file open a file handle, and setup our curl streaming handler.

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if ( $parsed_args['stream'] ) {

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if ( ! WP_DEBUG ) {

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$this->stream_handle = @fopen( $parsed_args['filename'], 'w+' );

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} else {

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$this->stream_handle = fopen( $parsed_args['filename'], 'w+' );

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}

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if ( ! $this->stream_handle ) {

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return new WP_Error(

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'http_request_failed',

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sprintf(

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/* translators: 1: fopen(), 2: File name. */

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__( 'Could not open handle for %1$s to %2$s.' ),

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'fopen()',

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$parsed_args['filename']

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)

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);

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}

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} else {

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$this->stream_handle = false;

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}

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if ( ! empty( $parsed_args['headers'] ) ) {

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// cURL expects full header strings in each element.

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$headers = array();

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foreach ( $parsed_args['headers'] as $name => $value ) {

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$headers[] = "{$name}: $value";

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}

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curl_setopt( $handle, CURLOPT_HTTPHEADER, $headers );

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}

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if ( '1.0' === $parsed_args['httpversion'] ) {

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curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0 );

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} else {

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curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1 );

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}

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/**

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* Fires before the cURL request is executed.

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*

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* Cookies are not currently handled by the HTTP API. This action allows

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* plugins to handle cookies themselves.

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*

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* @since 2.8.0

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*

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* @param resource $handle The cURL handle returned by curl_init() (passed by reference).

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* @param array $parsed_args The HTTP request arguments.

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* @param string $url The request URL.

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*/

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do_action_ref_array( 'http_api_curl', array( &$handle, $parsed_args, $url ) );

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// We don't need to return the body, so don't. Just execute request and return.

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if ( ! $parsed_args['blocking'] ) {

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curl_exec( $handle );

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$curl_error = curl_error( $handle );

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if ( $curl_error ) {

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if ( PHP_VERSION_ID < 80000 ) { // curl_close() has no effect as of PHP 8.0.

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curl_close( $handle );

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}

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return new WP_Error( 'http_request_failed', $curl_error );

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}

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if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ), true ) ) {

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if ( PHP_VERSION_ID < 80000 ) { // curl_close() has no effect as of PHP 8.0.

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curl_close( $handle );

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}

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return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );

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}

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if ( PHP_VERSION_ID < 80000 ) { // curl_close() has no effect as of PHP 8.0.

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curl_close( $handle );

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}

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return array(

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'headers' => array(),

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'body' => '',

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'response' => array(

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'code' => false,

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'message' => false,

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),

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'cookies' => array(),

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);

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}

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curl_exec( $handle );

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$processed_headers = WP_Http::processHeaders( $this->headers, $url );

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$body = $this->body;

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$bytes_written_total = $this->bytes_written_total;

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$this->headers = '';

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$this->body = '';

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$this->bytes_written_total = 0;

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$curl_error = curl_errno( $handle );

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// If an error occurred, or, no response.

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if ( $curl_error || ( 0 === strlen( $body ) && empty( $processed_headers['headers'] ) ) ) {

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if ( CURLE_WRITE_ERROR /* 23 */ === $curl_error ) {

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if ( ! $this->max_body_length || $this->max_body_length !== $bytes_written_total ) {

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if ( $parsed_args['stream'] ) {

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if ( PHP_VERSION_ID < 80000 ) { // curl_close() has no effect as of PHP 8.0.

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curl_close( $handle );

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}

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fclose( $this->stream_handle );

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return new WP_Error( 'http_request_failed', __( 'Failed to write request to temporary file.' ) );

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} else {

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if ( PHP_VERSION_ID < 80000 ) { // curl_close() has no effect as of PHP 8.0.

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curl_close( $handle );

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}

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return new WP_Error( 'http_request_failed', curl_error( $handle ) );

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}

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}

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} else {

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$curl_error = curl_error( $handle );

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if ( $curl_error ) {

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if ( PHP_VERSION_ID < 80000 ) { // curl_close() has no effect as of PHP 8.0.

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curl_close( $handle );

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}

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return new WP_Error( 'http_request_failed', $curl_error );

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}

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}

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if ( in_array( curl_getinfo( $handle, CURLINFO_HTTP_CODE ), array( 301, 302 ), true ) ) {

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if ( PHP_VERSION_ID < 80000 ) { // curl_close() has no effect as of PHP 8.0.

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curl_close( $handle );

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}

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return new WP_Error( 'http_request_failed', __( 'Too many redirects.' ) );

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}

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}

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if ( PHP_VERSION_ID < 80000 ) { // curl_close() has no effect as of PHP 8.0.

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curl_close( $handle );

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}

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if ( $parsed_args['stream'] ) {

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fclose( $this->stream_handle );

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}

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$response = array(

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'headers' => $processed_headers['headers'],

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'body' => null,

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'response' => $processed_headers['response'],

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'cookies' => $processed_headers['cookies'],

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'filename' => $parsed_args['filename'],

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);

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// Handle redirects.

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$redirect_response = WP_Http::handle_redirects( $url, $parsed_args, $response );

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if ( false !== $redirect_response ) {

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return $redirect_response;

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}

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if ( true === $parsed_args['decompress']

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&& true === WP_Http_Encoding::should_decode( $processed_headers['headers'] )

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) {

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$body = WP_Http_Encoding::decompress( $body );

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}

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$response['body'] = $body;

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return $response;

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}

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/**

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* Grabs the headers of the cURL request.

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*

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* Each header is sent individually to this callback, and is appended to the `$header` property

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* for temporary storage.

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*

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* @since 3.2.0

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*

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* @param resource $handle cURL handle.

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* @param string $headers cURL request headers.

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* @return int Length of the request headers.

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*/

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private function stream_headers( $handle, $headers ) {

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$this->headers .= $headers;

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return strlen( $headers );

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}

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/**

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* Grabs the body of the cURL request.

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*

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* The contents of the document are passed in chunks, and are appended to the `$body`

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* property for temporary storage. Returning a length shorter than the length of

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* `$data` passed in will cause cURL to abort the request with `CURLE_WRITE_ERROR`.

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*

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* @since 3.6.0

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*

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* @param resource $handle cURL handle.

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* @param string $data cURL request body.

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* @return int Total bytes of data written.

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*/

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private function stream_body( $handle, $data ) {

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$data_length = strlen( $data );

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if ( $this->max_body_length && ( $this->bytes_written_total + $data_length ) > $this->max_body_length ) {

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$data_length = ( $this->max_body_length - $this->bytes_written_total );

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$data = substr( $data, 0, $data_length );

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}

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if ( $this->stream_handle ) {

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$bytes_written = fwrite( $this->stream_handle, $data );

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} else {

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$this->body .= $data;

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$bytes_written = $data_length;

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}

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$this->bytes_written_total += $bytes_written;

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// Upon event of this function returning less than strlen( $data ) curl will error with CURLE_WRITE_ERROR.

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return $bytes_written;

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}

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/**

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* Determines whether this class can be used for retrieving a URL.

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*

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* @since 2.7.0

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*

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* @param array $args Optional. Array of request arguments. Default empty array.

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* @return bool False means this class can not be used, true means it can.

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*/

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public static function test( $args = array() ) {

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if ( ! function_exists( 'curl_init' ) || ! function_exists( 'curl_exec' ) ) {

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return false;

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}

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

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if ( $is_ssl ) {

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$curl_version = curl_version();

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// Check whether this cURL version support SSL requests.

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if ( ! ( CURL_VERSION_SSL & $curl_version['features'] ) ) {

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return false;

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}

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}

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/**

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* Filters whether cURL can be used as a transport for retrieving a URL.

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*

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* @since 2.7.0

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*

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* @param bool $use_class Whether the class can be used. Default true.

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* @param array $args An array of request arguments.

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*/

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return apply_filters( 'use_curl_transport', true, $args );

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}

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}

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