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feat: NITRO_APP_BASE_URL can be used at runtime #4670

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feat: NITRO_APP_BASE_URL can be used at runtime #4670

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4dc23b0
first test implementation
jvllmr Sep 26, 2026
6f27549
revert formatting
jvllmr Sep 26, 2026
f23a26e
revert more formatting
jvllmr Sep 26, 2026
faa2d31
create an actually working example
jvllmr Sep 26, 2026
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13 changes: 13 additions & 0 deletions src/build/virtual/app.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ export default function app(nitro: Nitro) {
const hasPlugins = nitro.options.plugins.length > 0;
const hasHooks = nitro.options.features?.runtimeHooks ?? hasPlugins;
const hasAsyncContext = !!nitro.options.experimental.asyncContext;
const runtimeBaseUrl = nitro.options.features.runtimeBaseURL;

const routingImports = [
hasRoutes && "findRoute",
Expand Down Expand Up @@ -90,6 +91,18 @@ export default function app(nitro: Nitro) {
` };`
);

if (runtimeBaseUrl) {
imports.push(`import { requestWithBaseURL } from "h3";`);
code.push(
``,
` const baseUrl = process.env.NITRO_APP_BASE_URL ?? "";`,
` const baseHandler = appHandler;`,
` appHandler = (req) => {`,
` return baseHandler(requestWithBaseURL(req, baseUrl));`,
` };`
);
}

if (hasAsyncContext) {
imports.push(`import { nitroAsyncContext } from "#nitro/runtime/context";`);
code.push(
Expand Down
5 changes: 5 additions & 0 deletions src/types/config.ts
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Expand Up @@ -314,6 +314,11 @@ export interface NitroOptions extends PresetOptions {
* Enable WebSocket support.
*/
websocket?: boolean;

/**
* Enable NITRO_APP_BASE_URL env var to take effect at runtime
*/
runtimeBaseURL?: boolean;
};

/**
Expand Down
1 change: 1 addition & 0 deletions src/types/global.ts
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Expand Up @@ -12,6 +12,7 @@ export interface NitroImportMeta {
_asyncContext?: boolean;
_tasks?: boolean;
_websocket?: boolean;
_runtimeBaseURL?: boolean;
}

declare global {
Expand Down