Curl::get_expect_header( string|array $data ): string

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This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

Get the correct “Expect” header for the given request data.


Data to send either as the POST body, or as parameters in the URL for a GET/HEAD.


string The "Expect" header.


		if (!is_array($data)) {
			return strlen((string) $data) >= 1048576 ? '100-Continue' : '';

		$bytesize = 0;
		$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($data));

		foreach ($iterator as $datum) {
			$bytesize += strlen((string) $datum);

			if ($bytesize >= 1048576) {
				return '100-Continue';

		return '';

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