default to HTML file proxy unless uri is http or https (#4939) (#4945)

Backports the fix for #4930
to the `2024.10` release by cherry-picking the commit from
#4939.

Co-authored-by: sharon wang <[email protected]>

src/vs/workbench/services/languageRuntime/common/languageRuntimeUiClient.ts

@@ -213,16 +213,18 @@ export class UiClientInstance extends Disposable {
 		const uriScheme = URI.parse(targetPath).scheme;
 		let url;
 
-		if (uriScheme === 'file') {
-			// If the path is for a file, start an HTML proxy server.
+		if (uriScheme === 'http' || uriScheme === 'https') {
+			// If the path is for a server, start a generic proxy server.
 			url = await this._commandService.executeCommand<string>(
-				'positronProxy.startHtmlProxyServer',
+				'positronProxy.startHttpProxyServer',
 				targetPath
 			);
-		} else if (uriScheme === 'http' || uriScheme === 'https') {
-			// If the path is for a server, start a generic proxy server.
+		} else {
+			// Assume the path is for a file and start an HTML proxy server.
+			// The uriScheme could be 'file' in this case, or even 'C' if the path is for an HTML
+			// file on a Windows machine.
 			url = await this._commandService.executeCommand<string>(
-				'positronProxy.startHttpProxyServer',
+				'positronProxy.startHtmlProxyServer',
 				targetPath
 			);
 		}