Confirm proxy use before the first web request (#657)

packages/platform/src/registry.ts

@@ -34,6 +34,9 @@ function host(): Platform {
  * and cannot be made to wait.
  */
 export const platform: Platform = {
+  get httpProxyUrl() {
+    return host().httpProxyUrl;
+  },
   get capabilities() {
     return host().capabilities;
   },

packages/platform/src/tauri/index.ts

@@ -124,6 +124,7 @@ export function createTauriPlatform(): Platform {
 
   return {
     capabilities: ALL_CAPABILITIES,
+    httpProxyUrl: null,
     window,
 
     clipboard: {

packages/platform/src/types.ts

@@ -186,6 +186,8 @@ export interface PlatformBlobs {
 
 export interface Platform {
   readonly capabilities: PlatformCapabilities;
+  /** Web request relay, or null when this host executes requests itself. */
+  readonly httpProxyUrl: string | null;
   readonly window: PlatformWindow;
   readonly clipboard: PlatformClipboard;
   readonly dialog: PlatformDialog;

packages/platform/src/web/index.ts

@@ -28,6 +28,7 @@ import type {
 import { commandSupport, runCommand } from "./commands";
 import { WorkerConnection } from "./connection";
 import { unsupported } from "./errors";
+import { serverBaseUrl } from "./server";
 import { requestPersistence } from "./storage";
 
 /** What this host can do, reported honestly. */
@@ -177,6 +178,7 @@ export function createWebPlatform(): Platform {
 
   return {
     capabilities,
+    httpProxyUrl: serverBaseUrl() || window.location.origin,
     window: createWindow(db),
 
     clipboard: {