		@@ -9,5 +9,6 @@ "use strict";
		const get_basic_1 = require("./utils/get_basic");
		const createHttpResponse = (statusCode, message) => {
		const statuses_1 = require("./statuses");
		const createHttpResponse = (statusCode, statusMessage, message = '') => {
		return [
		`HTTP/1.1 ${statusCode} ${http_1.default.STATUS_CODES[statusCode] \|\| 'Unknown Status Code'}`,
		`HTTP/1.1 ${statusCode} ${statusMessage \|\| http_1.default.STATUS_CODES[statusCode] \|\| 'Unknown Status Code'}`,
		'Connection: close',
		@@ -74,3 +75,7 @@ `Date: ${(new Date()).toUTCString()}`,
		else {
		sourceSocket.end(createHttpResponse(502, ''));
		const { statusCode } = response;
		const status = statusCode === 401 \|\| statusCode === 407
		? statuses_1.badGatewayStatusCodes.AUTH_FAILED
		: statuses_1.badGatewayStatusCodes.NON_200;
		sourceSocket.end(createHttpResponse(status, `UPSTREAM${response.statusCode}`));
		}
		@@ -110,2 +115,3 @@ return;
		client.on('error', (error) => {
		var _a, _b;
		server.log(proxyChainId, `Failed to connect to upstream proxy: ${error.stack}`);
		@@ -118,3 +124,5 @@ // The end socket may get connected after the client to proxy one gets disconnected.
		else {
		sourceSocket.end(createHttpResponse(502, ''));
		const statusCode = (_a = statuses_1.errorCodeToStatusCode[error.code]) !== null && _a !== void 0 ? _a : statuses_1.badGatewayStatusCodes.GENERIC_ERROR;
		const response = createHttpResponse(statusCode, (_b = error.code) !== null && _b !== void 0 ? _b : 'Upstream Closed Early');
		sourceSocket.end(response);
		}
		@@ -121,0 +129,0 @@ }

dist/forward.js

		@@ -12,2 +12,3 @@ "use strict";
		const count_target_bytes_1 = require("./utils/count_target_bytes");
		const statuses_1 = require("./statuses");
		const pipeline = util_1.default.promisify(stream_1.default.pipeline);
		@@ -62,3 +63,3 @@ /**
		if (statusCode < 100 \|\| statusCode > 999) {
		statusCode = 502;
		statusCode = statuses_1.badGatewayStatusCodes.STATUS_CODE_OUT_OF_RANGE;
		}
		@@ -90,10 +91,4 @@ // 407 is handled separately
		}
		const statuses = {
		ENOTFOUND: proxy ? 502 : 404,
		ECONNREFUSED: 502,
		ECONNRESET: 502,
		EPIPE: 502,
		ETIMEDOUT: 504,
		};
		response.statusCode = (_a = statuses[error.code]) !== null && _a !== void 0 ? _a : 502;
		const statusCode = (_a = statuses_1.errorCodeToStatusCode[error.code]) !== null && _a !== void 0 ? _a : statuses_1.badGatewayStatusCodes.GENERIC_ERROR;
		response.statusCode = !proxy && error.code === 'ENOTFOUND' ? 404 : statusCode;
		response.setHeader('content-type', 'text/plain; charset=utf-8');
		@@ -100,0 +95,0 @@ response.end(http_1.default.STATUS_CODES[response.statusCode]);

dist/server.js

		@@ -20,2 +20,3 @@ "use strict";
		const normalize_url_port_1 = require("./utils/normalize_url_port");
		const statuses_1 = require("./statuses");
		// TODO:
		@@ -196,6 +197,6 @@ // - Implement this requirement from rfc7230
		if (error.message === 'Username contains an invalid colon') {
		return new request_error_1.RequestError('Invalid colon in username in upstream proxy credentials', 502);
		return new request_error_1.RequestError('Invalid colon in username in upstream proxy credentials', statuses_1.badGatewayStatusCodes.AUTH_FAILED);
		}
		if (error.message === '407 Proxy Authentication Required') {
		return new request_error_1.RequestError('Invalid upstream proxy credentials', 502);
		return new request_error_1.RequestError('Invalid upstream proxy credentials', statuses_1.badGatewayStatusCodes.AUTH_FAILED);
		}
		@@ -202,0 +203,0 @@ return error;

package.json

		{
		"name": "proxy-chain",
		"version": "2.0.7",
		"version": "2.1.0-beta.0",
		"description": "Node.js implementation of a proxy server (think Squid) with support for SSL, authentication, upstream proxy chaining, and protocol tunneling.",
		@@ -5,0 +5,0 @@ "main": "dist/index.js",

README.md

		@@ -96,2 +96,54 @@ # Programmable HTTP proxy server for Node.js

		## A different approach to `502 Bad Gateway`

		`502` status code is not comprehensive enough. Therefore, the server may respond with `590-599` instead:

		### `590 Non Successful`

		Upstream responded with non-200 status code.

		### `591 RESERVED`

		This status code is reserved for further use.

		### `592 Status Code Out Of Range`

		Upstream respondend with status code different than 100-999.

		### `593 Not Found`

		DNS lookup failed - [`EAI_NODATA`](https://github.com/libuv/libuv/blob/cdbba74d7a756587a696fb3545051f9a525b85ac/include/uv.h#L82) or [`EAI_NONAME`](https://github.com/libuv/libuv/blob/cdbba74d7a756587a696fb3545051f9a525b85ac/include/uv.h#L83).

		### `594 Connection Refused`

		Upstream refused connection.

		### `595 Connection Reset`

		Connection reset due to loss of connection or timeout.

		### `596 Broken Pipe`

		Trying to write on a closed socket.

		### `597 Auth Failed`

		Incorrect upstream credentials.

		### `598 RESERVED`

		This status code is reserved for further use.

		### `599 Upstream Error`

		Generic upstream error.

		---

		`590` and `592` indicate an issue on the upstream side. \
		`593` indicates an incorrect `proxy-chain` configuration.\
		`594`, `595` and `596` may occur due to connection loss.\
		`597` indicates incorrect upstream credentials.\
		`599` is a generic error, where the above is not applicable.

		## Custom error responses
		@@ -98,0 +150,0 @@

dist/chain.d.ts.map