WP_Http_Encoding::accept_encoding() WordPress Method

	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 );
	}