Proxy path fixes (#4548)

* Fix issue where HTTP error status codes are not read.

* Fix issues surrounding sessions when accessed from a proxy.

- Updated vscode args to match latest upstream.
- Fixed issues surrounding trailing slashes affecting base paths.
- Updated cookie names to better match upstream's usage, debuggability.

* Bump vendor.

* Update tests.

* Fix issue where tests lack cookie key.

Co-authored-by: Asher <ash@coder.com>

src/node/http.ts

@@ -6,7 +6,7 @@ import * as net from "net"
 import path from "path"
 import qs from "qs"
 import { Disposable } from "../common/emitter"
-import { HttpCode, HttpError } from "../common/http"
+import { CookieKeys, HttpCode, HttpError } from "../common/http"
 import { normalize } from "../common/util"
 import { AuthType, DefaultedArgs } from "./cli"
 import { version as codeServerVersion } from "./constants"
@@ -93,7 +93,7 @@ export const authenticated = async (req: express.Request): Promise<boolean> => {
       const passwordMethod = getPasswordMethod(hashedPasswordFromArgs)
       const isCookieValidArgs: IsCookieValidArgs = {
         passwordMethod,
-        cookieKey: sanitizeString(req.cookies.key),
+        cookieKey: sanitizeString(req.cookies[CookieKeys.Session]),
         passwordFromArgs: req.args.password || "",
         hashedPasswordFromArgs: req.args["hashed-password"],
       }