Source
File: wp-includes/class-wp-http-encoding.php
public static function accept_encoding( $url, $args ) {
$type = array();
$compression_enabled = self::is_available();
if ( ! $args['decompress'] ) { // Decompression specifically disabled.
$compression_enabled = false;
} elseif ( $args['stream'] ) { // Disable when streaming to file.
$compression_enabled = false;
} elseif ( isset( $args['limit_response_size'] ) ) { // If only partial content is being requested, we won't be able to decompress it.
$compression_enabled = false;
}
if ( $compression_enabled ) {
if ( function_exists( 'gzinflate' ) ) {
$type[] = 'deflate;q=1.0';
}
if ( function_exists( 'gzuncompress' ) ) {
$type[] = 'compress;q=0.5';
}
if ( function_exists( 'gzdecode' ) ) {
$type[] = 'gzip;q=0.5';
}
}
/**
* Filters the allowed encoding types.
*
* @since 3.6.0
*
* @param string[] $type Array of what encoding types to accept and their priority values.
* @param string $url URL of the HTTP request.
* @param array $args HTTP request arguments.
*/
$type = apply_filters( 'wp_http_accept_encoding', $type, $url, $args );
return implode( ', ', $type );
}