Function callback

modules/network/http/http.js:135–396

(message, value)

Request.error = -2;

function callback(message, value) {
	let socket = this.socket;

	if (1 === message) {	// connected
		if (0 !== this.state)
			throw new Error("socket connected but http not in connecting state");

		this.state = 1;		// advance to sending request headers state

		const parts = [];
		parts.push(`${this.method} `, this.path, " HTTP/1.1\r\n");
		parts.push("Connection: close\r\n");

		let length, host = this.host;
		for (let i = 0; i < (this.headers?.length ?? 0); i += 2) {
			let name = this.headers[i].toString();
			parts.push(`${name}: `, this.headers[i + 1].toString(), "\r\n");
			name = name.toLowerCase();
			if ("content-length" === name)
				length = true;
			else if ("host" === name)
				host = undefined;
		}

		if (this.body && (true !== this.body) && !length) {
			length = (this.body instanceof ArrayBuffer) ? this.body.byteLength : this.body.length;
			parts.push(`content-length: ${length}\r\n`);
		}

		if (host)
			parts.push(`Host: ${host}\r\n`);

		parts.push("\r\n");

		delete this.method;
		delete this.path;
		delete this.host;
		delete this.headers;

		this.parts = parts;

		message = 3;
		value = socket.write();
	}

	if (3 === message) {	// safe to write more data
		if (1 == this.state) {
			const p = [], parts = this.parts;
			while (value && parts.length) {
				const length = parts[0].length;
				if (length <= value) {
					p.push(parts.shift());
					value -= length;
				}
				else {
					p.push(parts[0].slice(0, value));
					parts[0] = parts[0].slice(value);
					value = 0;