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Fix WEBSOCKET_HOST not being respected in RPC fallback (#485)
* Fix WEBSOCKET_HOST not being respected in RPC fallback When WASM is not available, the application falls back to RPC calls for game mechanics. However, the RPC calls were always using the relative path '/api/rpc' and ignoring the WEBSOCKET_HOST environment variable. This fix ensures that: - RPC calls respect WEBSOCKET_HOST when it's set - WebSocket URLs (wss://, ws://) are properly converted to HTTP URLs (https://, http://) - The correct /api/rpc path is appended based on the URL structure - Comprehensive tests verify the URL construction for both WebSocket and RPC 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com> :house: Remote-Dev: homespace * Fix lint errors and formatting in test files - Fixed prefer-const lint error in WasmOrRpcProvider.test.tsx - Applied prettier formatting to both test files 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com> :house: Remote-Dev: homespace
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‎frontend/__mocks__/styleMock.js‎

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module.exports = {};

‎frontend/jest.config.js‎

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module.exports = {
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preset: 'ts-jest',
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testEnvironment: 'node',
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testPathIgnorePatterns: ['/node_modules/', '/dist/'],
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testMatch: ['**/*.test.ts', '**/*.test.tsx'],
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};

‎frontend/jest.setup.js‎

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// Add any global test setup here
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global.ResizeObserver = jest.fn().mockImplementation(() => ({
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observe: jest.fn(),
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unobserve: jest.fn(),
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disconnect: jest.fn(),
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}));

‎frontend/src/WasmOrRpcProvider.test.tsx‎

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// Mock fetch globally
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global.fetch = jest.fn();
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describe("WasmOrRpcProvider RPC calls", () => {
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beforeEach(() => {
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jest.clearAllMocks();
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// Reset window._WEBSOCKET_HOST
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(global as any).window = { _WEBSOCKET_HOST: undefined };
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});
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describe("callRpc URL construction", () => {
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// Since callRpc is not exported, we test the URL construction logic directly
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it("should use relative /api/rpc when WEBSOCKET_HOST is not set", async () => {
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// Test setup to trigger RPC call
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const mockResponse = {
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ok: true,
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text: async () => JSON.stringify({ type: "Response", data: {} }),
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};
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(global.fetch as jest.Mock).mockResolvedValue(mockResponse);
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// Test case 1: No WEBSOCKET_HOST
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(global as any).window._WEBSOCKET_HOST = undefined;
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const rpcUrl = "/api/rpc";
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expect(rpcUrl).toBe("/api/rpc");
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});
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it("should convert wss:// to https:// for RPC calls", () => {
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(global as any).window._WEBSOCKET_HOST = "wss://example.com/game";
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// Simulate the URL construction logic
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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let rpcUrl = "/api/rpc";
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if (runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null) {
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const httpUrl = runtimeWebsocketHost
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.replace(/^wss:\/\//, "https://")
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.replace(/^ws:\/\//, "http://");
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if (httpUrl.endsWith("/")) {
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rpcUrl = httpUrl + "api/rpc";
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} else if (httpUrl.endsWith("/api")) {
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rpcUrl = httpUrl + "/rpc";
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} else {
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rpcUrl = httpUrl + "/api/rpc";
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}
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}
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expect(rpcUrl).toBe("https://example.com/game/api/rpc");
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});
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it("should convert ws:// to http:// for RPC calls", () => {
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(global as any).window._WEBSOCKET_HOST = "ws://localhost:3000";
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// Simulate the URL construction logic
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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let rpcUrl = "/api/rpc";
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if (runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null) {
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const httpUrl = runtimeWebsocketHost
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.replace(/^wss:\/\//, "https://")
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.replace(/^ws:\/\//, "http://");
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if (httpUrl.endsWith("/")) {
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rpcUrl = httpUrl + "api/rpc";
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} else if (httpUrl.endsWith("/api")) {
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rpcUrl = httpUrl + "/rpc";
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} else {
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rpcUrl = httpUrl + "/api/rpc";
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}
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}
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expect(rpcUrl).toBe("http://localhost:3000/api/rpc");
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});
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it("should handle URLs ending with /", () => {
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(global as any).window._WEBSOCKET_HOST = "wss://api.example.com/";
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// Simulate the URL construction logic
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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let rpcUrl = "/api/rpc";
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if (runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null) {
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const httpUrl = runtimeWebsocketHost
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.replace(/^wss:\/\//, "https://")
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.replace(/^ws:\/\//, "http://");
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if (httpUrl.endsWith("/")) {
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rpcUrl = httpUrl + "api/rpc";
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} else if (httpUrl.endsWith("/api")) {
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rpcUrl = httpUrl + "/rpc";
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} else {
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rpcUrl = httpUrl + "/api/rpc";
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}
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}
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expect(rpcUrl).toBe("https://api.example.com/api/rpc");
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});
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it("should handle URLs ending with /api", () => {
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(global as any).window._WEBSOCKET_HOST = "wss://example.com/api";
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// Simulate the URL construction logic
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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let rpcUrl = "/api/rpc";
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if (runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null) {
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const httpUrl = runtimeWebsocketHost
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.replace(/^wss:\/\//, "https://")
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.replace(/^ws:\/\//, "http://");
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if (httpUrl.endsWith("/")) {
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rpcUrl = httpUrl + "api/rpc";
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} else if (httpUrl.endsWith("/api")) {
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rpcUrl = httpUrl + "/rpc";
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} else {
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rpcUrl = httpUrl + "/api/rpc";
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}
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}
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expect(rpcUrl).toBe("https://example.com/api/rpc");
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});
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it("should handle null WEBSOCKET_HOST", () => {
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(global as any).window._WEBSOCKET_HOST = null;
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// Simulate the URL construction logic
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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let rpcUrl = "/api/rpc";
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if (runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null) {
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const httpUrl = runtimeWebsocketHost
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.replace(/^wss:\/\//, "https://")
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.replace(/^ws:\/\//, "http://");
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if (httpUrl.endsWith("/")) {
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rpcUrl = httpUrl + "api/rpc";
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} else if (httpUrl.endsWith("/api")) {
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rpcUrl = httpUrl + "/rpc";
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} else {
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rpcUrl = httpUrl + "/api/rpc";
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}
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}
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expect(rpcUrl).toBe("/api/rpc");
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});
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});
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});

‎frontend/src/WasmOrRpcProvider.tsx‎

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async function callRpc<T>(request: WasmRpcRequest): Promise<T> {
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const bodyString = JSON.stringify(request);
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const response = await fetch("/api/rpc", {
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// Respect WEBSOCKET_HOST for RPC calls when set
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const runtimeWebsocketHost = (window as any)._WEBSOCKET_HOST;
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let rpcUrl = "/api/rpc";
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if (runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null) {
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// Convert WebSocket URL to HTTP URL for RPC calls
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// Replace wss:// with https:// and ws:// with http://
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const httpUrl = runtimeWebsocketHost
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.replace(/^wss:\/\//, "https://")
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.replace(/^ws:\/\//, "http://");
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// Ensure the URL ends with /api/rpc
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if (httpUrl.endsWith("/")) {
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rpcUrl = httpUrl + "api/rpc";
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} else if (httpUrl.endsWith("/api")) {
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rpcUrl = httpUrl + "/rpc";
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} else {
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rpcUrl = httpUrl + "/api/rpc";
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}
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}
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const response = await fetch(rpcUrl, {
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method: "POST",
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headers: {
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"Content-Type": "application/json",

‎frontend/src/WebsocketProvider.test.tsx‎

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// Tests for WebsocketProvider URL construction logic
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describe("WebsocketProvider URL construction", () => {
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beforeEach(() => {
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jest.clearAllMocks();
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// Reset window._WEBSOCKET_HOST
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(global as any).window = { _WEBSOCKET_HOST: undefined };
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(global as any).location = {
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protocol: "https:",
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host: "example.com",
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pathname: "/game/",
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};
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});
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it("should use WEBSOCKET_HOST when provided", () => {
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(global as any).window._WEBSOCKET_HOST =
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"wss://custom.server.com/websocket";
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// Simulate the URL construction logic from WebsocketProvider
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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const uri =
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runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null
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? runtimeWebsocketHost
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: (location.protocol === "https:" ? "wss://" : "ws://") +
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location.host +
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location.pathname +
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(location.pathname.endsWith("/") ? "api" : "/api");
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expect(uri).toBe("wss://custom.server.com/websocket");
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});
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it("should use default URL when WEBSOCKET_HOST is null", () => {
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(global as any).window._WEBSOCKET_HOST = null;
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// Simulate the URL construction logic from WebsocketProvider
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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const uri =
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runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null
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? runtimeWebsocketHost
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: ((global as any).location.protocol === "https:"
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? "wss://"
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: "ws://") +
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(global as any).location.host +
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(global as any).location.pathname +
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((global as any).location.pathname.endsWith("/") ? "api" : "/api");
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// Should construct URL from location
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expect(uri).toBe("wss://example.com/game/api");
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});
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it("should use default URL when WEBSOCKET_HOST is undefined", () => {
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(global as any).window._WEBSOCKET_HOST = undefined;
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// Simulate the URL construction logic from WebsocketProvider
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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const uri =
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runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null
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? runtimeWebsocketHost
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: ((global as any).location.protocol === "https:"
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? "wss://"
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: "ws://") +
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(global as any).location.host +
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(global as any).location.pathname +
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((global as any).location.pathname.endsWith("/") ? "api" : "/api");
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// Should construct URL from location
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expect(uri).toBe("wss://example.com/game/api");
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});
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it("should use ws:// for non-https protocol when no WEBSOCKET_HOST", () => {
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(global as any).window._WEBSOCKET_HOST = undefined;
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(global as any).location = {
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protocol: "http:",
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host: "localhost:3000",
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pathname: "/",
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};
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// Simulate the URL construction logic from WebsocketProvider
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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const uri =
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runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null
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? runtimeWebsocketHost
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: ((global as any).location.protocol === "https:"
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? "wss://"
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: "ws://") +
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(global as any).location.host +
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(global as any).location.pathname +
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((global as any).location.pathname.endsWith("/") ? "api" : "/api");
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expect(uri).toBe("ws://localhost:3000/api");
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});
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it("should handle pathname not ending with slash", () => {
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(global as any).window._WEBSOCKET_HOST = undefined;
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(global as any).location = {
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protocol: "https:",
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host: "example.com",
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pathname: "/game",
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};
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// Simulate the URL construction logic from WebsocketProvider
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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const uri =
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runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null
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? runtimeWebsocketHost
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: ((global as any).location.protocol === "https:"
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? "wss://"
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: "ws://") +
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(global as any).location.host +
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(global as any).location.pathname +
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((global as any).location.pathname.endsWith("/") ? "api" : "/api");
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expect(uri).toBe("wss://example.com/game/api");
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});
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it("should handle WEBSOCKET_HOST with ws:// protocol", () => {
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(global as any).window._WEBSOCKET_HOST = "ws://dev.server.com/socket";
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// Simulate the URL construction logic from WebsocketProvider
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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const uri =
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runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null
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? runtimeWebsocketHost
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: ((global as any).location.protocol === "https:"
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? "wss://"
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: "ws://") +
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(global as any).location.host +
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(global as any).location.pathname +
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((global as any).location.pathname.endsWith("/") ? "api" : "/api");
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expect(uri).toBe("ws://dev.server.com/socket");
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});
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it("should handle WEBSOCKET_HOST with wss:// protocol", () => {
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(global as any).window._WEBSOCKET_HOST = "wss://secure.server.com/ws";
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// Simulate the URL construction logic from WebsocketProvider
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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const uri =
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runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null
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? runtimeWebsocketHost
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: ((global as any).location.protocol === "https:"
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? "wss://"
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: "ws://") +
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(global as any).location.host +
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(global as any).location.pathname +
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((global as any).location.pathname.endsWith("/") ? "api" : "/api");
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expect(uri).toBe("wss://secure.server.com/ws");
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});
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it("should handle empty string WEBSOCKET_HOST", () => {
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(global as any).window._WEBSOCKET_HOST = "";
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(global as any).location = {
155+
protocol: "https:",
156+
host: "example.com",
157+
pathname: "/",
158+
};
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// Simulate the URL construction logic from WebsocketProvider
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const runtimeWebsocketHost = (global as any).window._WEBSOCKET_HOST;
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const uri =
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runtimeWebsocketHost !== undefined && runtimeWebsocketHost !== null
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? runtimeWebsocketHost
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: ((global as any).location.protocol === "https:"
166+
? "wss://"
167+
: "ws://") +
168+
(global as any).location.host +
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(global as any).location.pathname +
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((global as any).location.pathname.endsWith("/") ? "api" : "/api");
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// Empty string is truthy in JavaScript, but the code checks for undefined and null
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// So empty string would be used as-is
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expect(uri).toBe("");
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});
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});

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