Make providers endpoint-agnostic

A provider can now be registered on multiple endpoints (or potentially
moved if needed).

src/node/app/proxy.ts

@@ -24,7 +24,7 @@ export class ProxyHttpProvider extends HttpProvider {
     const port = route.base.replace(/^\//, "")
     return {
       proxy: {
-        base: `${this.options.base}/${port}`,
+        base: `${route.providerBase}/${port}`,
         port,
       },
     }
@@ -35,7 +35,7 @@ export class ProxyHttpProvider extends HttpProvider {
     const port = route.base.replace(/^\//, "")
     return {
       proxy: {
-        base: `${this.options.base}/${port}`,
+        base: `${route.providerBase}/${port}`,
         port,
       },
     }

src/node/app/vscode.ts

@@ -131,7 +131,7 @@ export class VscodeHttpProvider extends HttpProvider {
         if (!this.isRoot(route)) {
           throw new HttpError("Not found", HttpCode.NotFound)
         } else if (!this.authenticated(request)) {
-          return { redirect: "/login", query: { to: this.options.base } }
+          return { redirect: "/login", query: { to: route.providerBase } }
         }
         try {
           return await this.getRoot(request, route)