Curl::stream_headers( resource|CurlHandle $handle, string $headers ): integer

Source

	// Why do we do this? cURL will send both the final response and any
	// interim responses, such as a 100 Continue. We don't need that.
	// (We may want to keep this somewhere just in case)
	if ($this->done_headers) {
		$this->headers      = '';
		$this->done_headers = false;
	}

	$this->headers .= $headers;

	if ($headers === "\r\n") {
		$this->done_headers = true;
	}

	return strlen($headers);
}

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