function geExpectedReceivedHeaders (url) {
	const expectedReceivedHeaders = ["Content-Type"];
	const expectedReceivedHeadersMatch = new RegExp("expectedheaders=(.+?)(&|$)", "g").exec(url);
	if (expectedReceivedHeadersMatch) {
		const headers = expectedReceivedHeadersMatch[1].split(",");
		for (const header of headers) {
			expectedReceivedHeaders.push(header);
		}
	}
	return expectedReceivedHeaders;
}
Gets the headers expected from the response.
@param {string} url - The url containing the expected headers from the response.
@returns {string[]} headers - The name of the expected headers.