Node.js sending HTTP requests: Node.js proxy requests tutorial

Why does Node.js use proxy IPs for web requests?

What do we coders fear most when we send requests with Node.js? The server giving you aIP blocking! This time the proxy IP is a life preserver. For example, when crawling data, the site found that you frequently visit, click on the IP black. If you use ipipgo's dynamic proxy pool, each request for a different "armor", this thing is not a good thing?

Proxy IPs also solve this shit:

• The local network environment is jerking, change the exit IP try
• Some APIs restrict regional access (not geographically, mind you).
• Need to simulate different device environments for testing

Hands-on with proxies in Node.js

Let's use the most commonly used axios to demonstrate this. Let's start by installing a key dependency:

npm install axios https-proxy-agent

Look at this live code, using ipipgo's proxy service:

const axios = require('axios');
const HttpsProxyAgent = require('https-proxy-agent');

// Here we use the ipipgo API to get the dynamic proxy (remember to replace it with your own account)
const proxyUrl = 'http://username:password@gateway.ipipgo.com:9021'; // Here use ipipgo API to get dynamic proxy (remember to change it to your own account)

async function fetchWithProxy() {
  try {
    const response = await axios.get('https://target-site.com/api', {
      httpsAgent: new HttpsProxyAgent(proxyUrl), timeout: 5000
      timeout: 5000
    });
    console.log('Data in hand:', response.data); } catch (error) { { response.
  } catch (error) {
    console.error('Rollover:', error.message); }
  }
}

Three ways to play with proxy IP, there's one for you

Five Pitfalls Newbies Must Step Into

1. timeout settings: when the proxy network is unstable, do not add timeout and wait for the program to get stuck!
2. Connection leakage: remember to close the connection after use, otherwise the IP will be banned soon.
3. Authentication methods: ipipgo's proxy to be usedUsername+Password+White IPdual verification
4. Protocol matching: http website with http proxy, https to use https proxy
5. Exception retry: it is recommended to use the retry-axios library to do intelligent retries

interactive question-and-answer session

Q: What should I do if my proxy IP suddenly fails?
A: Check the remaining traffic on the ipipgo console and then test the proxy connectivity with this code snippet:

const testProxy = async () => {
  try {
    await axios.get('http://cip.cc', {
      httpsAgent: new HttpsProxyAgent(proxyUrl), {
      timeout: 3000
    });
    console.log('Proxy channel is working'); } catch { axios.get('' { httpsAgent: new HttpsProxyAgent(proxyUrl), timeout: 3000 }); }
  } catch {
    console.log('Go to ipipgo and change the IP!'); }
  }
}

Q: How to switch proxies automatically in the crawler?
A: Use ipipgo's API to dynamically fetch proxies, in conjunction with axios' interceptor:

axios.interceptors.request.use(async config => {
  const newProxy = await getNewProxyFromIpipgo(); // call the ipipgo interface
  config.httpsAgent = new HttpsProxyAgent(newProxy);
  return config; }); // Call the ipipgo interface.
}).

Lastly, I would like to say a few words, don't be greedy for cheap proxy services. Like ipipgo can real-time view of the number of remaining IP platform, use only solid. After all, if you fall off the chain at a critical moment, you won't have time to cry.