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

To use the Node.js axios library for making HTTP requests with interceptors for automatic redirection handling in Koa, you can follow these steps:

1. Install axios and koa if you haven't already installed them:

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npm install axios koa

2. Import the necessary modules in your Koa application file:

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const Koa = require('koa');
const axios = require('axios');

3. Create a Koa app instance:

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const app = new Koa();

4. Define your axios instance with interceptors for automatic redirection handling:

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const axiosInstance = axios.create();

axiosInstance.interceptors.response.use(
  response => {
    // If the response status is in the range of 300-399, handle redirection
    if (response.status >= 300 && response.status < 400 && response.headers.location) {
      // Perform the redirection
      return axiosInstance.get(response.headers.location);
    }
    return response;
  },
  error => {
    // Handle errors
    return Promise.reject(error);
  }
);

5. Use the axios instance to make HTTP requests within your Koa routes or middleware:

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app.use(async (ctx, next) => {
  try {
    // Make a GET request using axios
    const response = await axiosInstance.get('https://example.com');
    
    // Set the response body in the Koa context
    ctx.body = response.data;
  } catch (error) {
    // Handle errors
    console.error(error);
    ctx.status = error.response.status || 500;
    ctx.body = error.response.data;
  }
});

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

With this setup, the Axios instance axiosInstance will automatically handle HTTP redirections for you. When you make a request using this instance, it will intercept responses with HTTP status codes in the range 300-399, check for the presence of a Location header, and follow the redirection if it exists.

Make sure to adjust the error handling and other configurations based on your specific requirements.