fix profile import/export in web (#171753)

- move it to configuration-editing extension

extensions/configuration-editing/src/node/net.ts

@@ -0,0 +1,29 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { Agent, globalAgent } from 'https';
+import { URL } from 'url';
+import { httpsOverHttp } from 'tunnel';
+import { window } from 'vscode';
+
+export const agent = getAgent();
+
+/**
+ * Return an https agent for the given proxy URL, or return the
+ * global https agent if the URL was empty or invalid.
+ */
+function getAgent(url: string | undefined = process.env.HTTPS_PROXY): Agent {
+	if (!url) {
+		return globalAgent;
+	}
+	try {
+		const { hostname, port, username, password } = new URL(url);
+		const auth = username && password && `${username}:${password}`;
+		return httpsOverHttp({ proxy: { host: hostname, port, proxyAuth: auth } });
+	} catch (e) {
+		window.showErrorMessage(`HTTPS_PROXY environment variable ignored: ${e.message}`);
+		return globalAgent;
+	}
+}