> ## Documentation Index
> Fetch the complete documentation index at: https://docs.twenty.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 3. HTTP routes

> Trigger the function over HTTP and render documents as web pages.

The same handler can also answer HTTP requests. We'll add two routes:

* a **POST** endpoint the UI calls to generate a document, and
* a public **GET** endpoint that renders a document as a printable web page.

Both use `httpRouteTriggerSettings`. App routes are served under `/s` on your
Twenty server (e.g. `http://localhost:2020/s/documents/generate`).

## POST route — generate on demand

This reuses `generateDocumentHandler`, so there's no logic to repeat — just a thin
adapter that reads the request body.

```ts filename="src/logic-functions/generate-document-route.ts" theme={null}
import { defineLogicFunction, type RoutePayload } from 'twenty-sdk/define';
import { Response } from 'twenty-sdk/logic-function';
import { generateDocumentHandler } from 'src/logic-functions/handlers/generate-document-handler';

const handler = async (event: RoutePayload): Promise<Response> => {
  const body = event.body as Record<string, unknown> | null;

  const result = await generateDocumentHandler({
    templateId: (body?.templateId as string) ?? '',
    recordId: (body?.recordId as string) ?? '',
  });

  // Map the handler's failure reason onto a real HTTP status (400/404/500)
  // instead of always returning 200.
  return new Response(JSON.stringify(result), {
    status: result.success ? 200 : (result.status ?? 400),
    headers: { 'Content-Type': 'application/json' },
  });
};

export default defineLogicFunction({
  universalIdentifier: GENERATE_DOCUMENT_ROUTE_UNIVERSAL_IDENTIFIER,
  name: 'generate-document-route',
  timeoutSeconds: 30,
  handler,
  httpRouteTriggerSettings: {
    path: '/documents/generate',
    httpMethod: 'POST',
    isAuthRequired: true,
  },
});
```

The shared handler returns a suggested `status` on failure, so the route can
answer with a proper `4xx`/`5xx` code. `isAuthRequired: true` means the caller
must present a valid token — the front component in the next chapter passes the
user's access token automatically.

## GET route — render as a web page

To return HTML instead of JSON, wrap the body in a `Response` with a
`Content-Type` header. This route is public (`isAuthRequired: false`) so a
generated document can be shared as a link.

```ts filename="src/logic-functions/view-document.ts" theme={null}
import { defineLogicFunction, type RoutePayload } from 'twenty-sdk/define';
import { Response } from 'twenty-sdk/logic-function';
import { CoreApiClient } from 'twenty-client-sdk/core';
import { documentHtmlPage } from 'src/utils/render-document';

const htmlResponse = (html: string, status = 200): Response =>
  new Response(html, { status, headers: { 'Content-Type': 'text/html; charset=utf-8' } });

const handler = async (event: RoutePayload): Promise<Response> => {
  const documentId = event.queryStringParameters?.id;

  if (!documentId) {
    return htmlResponse(documentHtmlPage('Missing document id', 'Provide ?id=<documentId>.'), 400);
  }

  // Filtered list query so an unknown id renders a clean 404 page instead of throwing.
  const { documents } = await new CoreApiClient().query({
    documents: {
      __args: { filter: { id: { eq: documentId } }, first: 1 },
      edges: { node: { id: true, name: true, content: true } },
    },
  });

  const document = documents?.edges?.[0]?.node;
  if (!document?.id) {
    return htmlResponse(documentHtmlPage('Document not found', `No document with id ${documentId}.`), 404);
  }

  return htmlResponse(documentHtmlPage(document.name ?? 'Document', document.content ?? ''));
};

export default defineLogicFunction({
  universalIdentifier: VIEW_DOCUMENT_ROUTE_UNIVERSAL_IDENTIFIER,
  name: 'view-document',
  timeoutSeconds: 15,
  handler,
  httpRouteTriggerSettings: {
    path: '/documents/view',
    httpMethod: 'GET',
    isAuthRequired: false,
  },
});
```

`documentHtmlPage` renders the Markdown body to HTML (with [marked](https://marked.js.org/),
sanitized) and drops it into a clean, printable page that shows just the template
content — the same look as the PDF and the in-app preview.
[See the helper](https://github.com/twentyhq/twenty/blob/main/packages/twenty-apps/examples/document-generator/src/utils/render-document.ts).

## Try it

With a template and a Person in your workspace, call the route (grab a token from
**Settings → APIs & Webhooks**):

```bash filename="Terminal" theme={null}
curl -X POST http://localhost:2020/s/documents/generate \
  -H "Authorization: Bearer $TOKEN" -H "Content-Type: application/json" \
  -d '{"templateId":"<templateId>","recordId":"<personId>"}'
# → {"success":true,"documentId":"...","content":"Dear Jeffery Griffin, ..."}
```

Open the returned document in your browser:

```
http://localhost:2020/s/documents/view?id=<documentId>
```

<Frame caption="The public GET route renders the document as a printable page.">
  <img src="https://mintcdn.com/twenty/sqJBeTZq-W-RDBPU/images/docs/developers/extends/apps/document-generator/07-rendered-document.png?fit=max&auto=format&n=sqJBeTZq-W-RDBPU&q=85&s=8b99ef8465512b51a2f7233518a869d2" alt="A rendered document web page" width="1600" height="1178" data-path="images/docs/developers/extends/apps/document-generator/07-rendered-document.png" />
</Frame>

<Tip>
  You can also stream a function's logs while testing with
  `yarn twenty dev:function:logs`, or invoke it directly with
  `yarn twenty dev:function:exec`.
</Tip>

**After this step:** the app can generate documents over HTTP and serve them as
web pages. Now let's make it usable without `curl`.

<Card title="Next: building the UI →" icon="table-columns" href="/developers/extend/apps/tutorials/document-generator/building-the-ui">
  Views, navigation, a command, and a front component.
</Card>