How to use the Node.js axios library for making HTTP requests with interceptors for automatic cookie handling in Koa



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To use the Node.js Axios library for making HTTP requests with interceptors for automatic cookie handling in Koa, you'll need to create a custom middleware in your Koa application. Here's how you can do it:

  1. Install Axios and Koa: First, make sure you have installed the axios and koa packages.
bash
npm install axios koa
  1. Create Axios Middleware: Implement a custom middleware that integrates Axios with Koa and automatically handles cookies.
javascript
const axios = require('axios');

function axiosMiddleware() {
  return async (ctx, next) => {
    // Create Axios instance with defaults
    ctx.axios = axios.create({
      baseURL: 'https://api.example.com', // Set your API base URL here
      timeout: 5000, // Set timeout as needed
    });

    // Add request interceptor to attach cookies
    ctx.axios.interceptors.request.use(
      (config) => {
        // Attach cookies from Koa context to Axios request headers
        const cookies = ctx.cookies.get();
        if (cookies) {
          config.headers.Cookie = Object.entries(cookies)
            .map(([key, value]) => `${key}=${value}`)
            .join('; ');
        }
        return config;
      },
      (error) => {
        return Promise.reject(error);
      }
    );

    // Add response interceptor to update Koa cookies
    ctx.axios.interceptors.response.use(
      (response) => {
        // Update Koa cookies with cookies received in Axios response
        const setCookieHeader = response.headers['set-cookie'];
        if (setCookieHeader) {
          setCookieHeader.forEach((cookie) => {
            const [nameValue, ...options] = cookie.split(';');
            const [name, value] = nameValue.split('=');
            ctx.cookies.set(name.trim(), value.trim(), options);
          });
        }
        return response;
      },
      (error) => {
        return Promise.reject(error);
      }
    );

    await next();
  };
}

module.exports = axiosMiddleware;
  1. Integrate Middleware with Koa Application: Use the middleware in your Koa application.
javascript
const Koa = require('koa');
const axiosMiddleware = require('./axiosMiddleware');

const app = new Koa();

// Use Axios middleware
app.use(axiosMiddleware());

// Example route
app.use(async (ctx) => {
  try {
    // Make a GET request using ctx.axios
    const response = await ctx.axios.get('/data');
    ctx.body = response.data;
  } catch (error) {
    ctx.status = error.response.status || 500;
    ctx.body = error.response.data || 'Internal Server Error';
  }
});

// Start the server
const port = process.env.PORT || 3000;
app.listen(port, () => {
  console.log(`Server running on port ${port}`);
});

In this example:

  • We create a custom middleware axiosMiddleware that attaches an Axios instance to the Koa context (ctx) with default configurations such as base URL and timeout.
  • We add request and response interceptors to the Axios instance to automatically attach and update cookies between Koa and Axios.
  • In the Koa application, we use axiosMiddleware() to apply the middleware.
  • Inside the Koa route handler, we make HTTP requests using ctx.axios, which automatically handles cookies.

Adjust the middleware and configurations according to your specific requirements and API endpoints. This setup provides a convenient way to use Axios for making HTTP requests with automatic cookie handling in a Koa application.

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