Wasp•8mo ago

Accessing request.body from api

Hey there, I would like to access the request.body from an api endpoint. I would like to know what should I wtite in the back end and as well in the main.wasp file in order to retrieve data from the request.body server side.

7 Replies

kapa.ai•8mo ago

Hi @act. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- To access the request.body from an API endpoint in Wasp, you need to set up a custom API endpoint and implement the corresponding server-side function. Here's how you can do it: 1. In your main.wasp file, declare a custom API endpoint:

api myCustomEndpoint {
  fn: import { myCustomEndpoint } from "@src/apis",
  httpRoute: (POST, "/my-custom-endpoint")
}

api myCustomEndpoint {
  fn: import { myCustomEndpoint } from "@src/apis",
  httpRoute: (POST, "/my-custom-endpoint")
}

2. In your server-side code (e.g., src/apis.js or src/apis.ts), implement the API function:

export const myCustomEndpoint = (req, res, context) => {
  const requestBody = req.body;
  console.log('Request body:', requestBody);
  
  // Process the request body as needed
  // ...

  res.json({ message: 'Received request body', data: requestBody });
};

export const myCustomEndpoint = (req, res, context) => {
  const requestBody = req.body;
  console.log('Request body:', requestBody);
  
  // Process the request body as needed
  // ...

  res.json({ message: 'Received request body', data: requestBody });
};

In this implementation, you can access the request body directly via req.body. Wasp uses Express.js under the hood, which automatically parses JSON and URL-encoded bodies by default. Wasp Documentation on Custom HTTP API Endpoints provides more details on setting up and using custom API endpoints in Wasp. Remember that the req object is an Express.js request object, so you have access to all its properties and methods, including req.body for accessing the request payload. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @act, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?

actOP•8mo ago

@kapa.ai I am doing something like this in the front end: const response = await fetch(${API_BASE_URL}/api/assistants/threads/${threadId}/messages, { method: 'POST', body: JSON.stringify({ content: text, }), }); But I am not getting anything in req.body. Is this corect ?

kapa.ai•8mo ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- Based on the information you've provided and the knowledge sources available, there are a few points to consider regarding your issue with req.body being empty: 1. API Usage: Instead of using fetch directly, Wasp recommends using the api object imported from wasp/client/api. This wrapper ensures proper handling of CORS and authentication. Wasp Documentation on Using the API from the Client suggests using it like this:

import { api } from "wasp/client/api";

// ...

const res = await api.post("/assistants/threads/${threadId}/messages", {
  content: text
});

import { api } from "wasp/client/api";

// ...

const res = await api.post("/assistants/threads/${threadId}/messages", {
  content: text
});

2. CORS Configuration: If you're using a custom API endpoint, you might need to ensure CORS is properly configured. Wasp provides a way to do this using apiNamespace. Wasp Documentation on Making Sure CORS Works explains how to set up CORS for custom API endpoints. 3. Server-side Implementation: Make sure your server-side API implementation is correctly set up to handle POST requests and parse the JSON body. Wasp uses Express.js middleware by default which should handle JSON parsing, but it's worth double-checking your implementation. 4. Content-Type Header: When using fetch, ensure you're setting the correct Content-Type header. Your current code doesn't show this, but it should be:

headers: {
  'Content-Type': 'application/json'
},

headers: {
  'Content-Type': 'application/json'
},

5. Debugging: To debug this issue, you could add some logging on the server-side to see what's coming through:

export const myApiFunction = (req, res, context) => {
  console.log('Headers:', req.headers);
  console.log('Body:', req.body);
  // ... rest of your function
};

export const myApiFunction = (req, res, context) => {
  console.log('Headers:', req.headers);
  console.log('Body:', req.body);
  // ... rest of your function
};

If you're still not seeing anything in req.body after trying these suggestions, there might be an issue with how the API is set up in your Wasp file or how the server is processing the request. In that case, you might need to review your entire API setup or consider opening an issue on the Wasp GitHub repository for more specific help. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @act, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?

miho•8mo ago

Have you tried using the api helper?

Rafael Pettersen•5mo ago

@kapa.ai I'm using fetch directly, from the frontend, because the core purpose of the fetch call in my application is not just to send the request but primarily to receive and process the continuous stream of data (SSE) coming back from the api endpoint in wasp. The client needs to keep this connection open and handle events (text, plan, tool_call, etc.) as they arrive. I've also thought about using Wasp Actions, but those actions are designed for operations that complete and return a result, not for maintaining an open streaming connection back to the specific client that initiated the call. n action cannot return the ReadableStream produced by the backend API back to the client through the action mechanism. The client must be the one to establish the direct connection to the /api/agent-chat endpoint to receive the SSE stream. And all that works fine in development env, but when I deploy to prod ( lets say fly.io ) it just stopped working. Can you help me here?

kapa.ai•5mo ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- Based on your description, it sounds like you're experiencing issues with Server-Sent Events (SSE) working in development but failing after deployment to Fly.io. This is a common issue when deploying Wasp applications, and there are a few potential solutions: CORS Configuration When deploying to Fly.io, you need to ensure your CORS settings are properly configured. In production, your client and server might be on different domains, which requires explicit CORS configuration. Make sure you've set the WASP_WEB_CLIENT_URL environment variable on your server deployment:

flyctl secrets set WASP_WEB_CLIENT_URL=<url_of_deployed_client>

flyctl secrets set WASP_WEB_CLIENT_URL=<url_of_deployed_client>

This tells your Wasp server where your client is hosted, allowing it to properly configure CORS. Fly.io (server and database) documentation mentions this as a required step. Webhook Configuration If you're using webhooks (which might be related to your streaming setup), you may need to update your webhook configuration for production. As mentioned in a Discord thread, when moving from development to production on Fly.io, webhook configurations often need to be updated:

"The Stripe CLI that the Open-Saas Docs reference has to do with local Dev, once you deploy to Fly.io for example, you have to change the webhook secret" Discord support thread

Client Environment Variables For client-side environment variables, remember they need to be set during build time, not at runtime. If you're using wasp deploy fly deploy, you can set client environment variables like this:

REACT_APP_SOME_VAR_NAME=somevalue wasp deploy fly deploy

REACT_APP_SOME_VAR_NAME=somevalue wasp deploy fly deploy

As confirmed in a Discord support thread, this approach works for setting client-side environment variables. Proxy Issues Your SSE connection might be failing due to proxy timeouts. Fly.io or other proxies in between might be closing idle connections. You might need to: 1. Configure your SSE connection to send periodic keep-alive messages 2. Adjust timeout settings on Fly.io if possible 3. Consider implementing a reconnection strategy on the client side There was a GitHub issue mentioning proxy-related problems with Wasp's dev server that might be relevant to your situation. Debugging Steps 1. Check server logs on Fly.io for any error messages 2. Verify network requests in your browser's developer tools 3. Try a simple test endpoint to confirm basic connectivity 4. Ensure your SSE endpoint is properly configured for production If you're still facing issues, you might need to share more specific error messages or logs from your deployment for more targeted help. Would you be able to share any error messages you're seeing in the browser console or server logs? P.S. Sometimes simply redeploying can fix issues, as mentioned in a Discord thread where a user's login functionality was restored after redeployment. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @Rafael Pettersen, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?

Carlos•5mo ago

@Rafael Pettersen you can see some streaming example at our repo: main.wasp file: https://github.com/wasp-lang/wasp/blob/main/examples/streaming/main.wasp streaming.ts file: https://github.com/wasp-lang/wasp/blob/main/examples/streaming/src/server/streaming.ts

GitHub

wasp/examples/streaming/main.wasp at main · wasp-lang/wasp

The fastest way to develop full-stack web apps with React & Node.js. - wasp-lang/wasp

GitHub

wasp/examples/streaming/src/server/streaming.ts at main · wasp-lan...

The fastest way to develop full-stack web apps with React & Node.js. - wasp-lang/wasp

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