Why is my proxy displaying, "You are not connected to the Internet?"

Question

I have a live server on a proxy, and whenever I search something up, it just says, "You are not connected to the Internet" or something like that. I think it may be due to the use of an iFrame and the X-Frame-Options HTTP header, but I'm not sure how to avoid it. Here's the relevant parts of the code: Server.js:

const express = require('express');
const https = require('https');
const http = require('http');
const app = express();
const port = 5500;

app.use(express.static('public'));

const rewriteUrls = (html, baseUrl) => {
  return html.replace(/(href|src)="([^"]*)"/g, (match, attr, url) => {
      const absoluteUrl = new URL(url, baseUrl).toString();
      return `${attr}="/proxy?url=${encodeURIComponent(absoluteUrl)}"`;
  });
};

app.get('/search', (req, res) => {
  const query = req.query.q;
  const googleSearchUrl = `https://www.google.com/search?q=${encodeURIComponent(query)}`;
  https.get(googleSearchUrl, (response) => {
      let data = '';
      response.on('data', chunk => {
          data += chunk;
      });
      response.on('end', () => {
          const rewrittenData = rewriteUrls(data, googleSearchUrl);
          res.send(rewrittenData);
      });
  }).on('error', (err) => {
      res.status(500).send('Error: ' + err.message);
  });
});

app.get('/urls', (req, res) => {
 let targetUrl = decodeURIComponent(req.query.url);
 const client = targetUrl.startsWith('https://') ? https : http;
 console.log(`Fetching URL: ${targetUrl}`);

 client.get(targetUrl, (response) => {
   let data = '';
   response.on('data', (chunk) => {
     data += chunk;
   });
   response.on('end', () => {
     res.send(data);
   });
 }).on('error', (err) => {
   console.error('Error fetching URL:', err.message);
   res.status(500).send('Error: ' + err.message);
 });
});

app.listen(port, () => {
console.log(`Server is running at http://localhost:${port}`);
});

Index.js:

let tabCount = 1;

function showTab(tabId) {
  const tabs = document.querySelectorAll('.tab-content');
    tabs.forEach(tab => tab.classList.remove('active'));
    document.getElementById(tabId).classList.add('active');
    const tabElements = document.querySelectorAll('.tab');
    tabElements.forEach(tab => tab.classList.remove('active'));
  event.target.classList.add('active');
}

function addNewTab() {
  tabCount++;
  const newTabId = `tab${tabCount}`;
  const newTab = document.createElement('div');
  newTab.className = 'tab';
  newTab.textContent = `Tab ${tabCount}`;
  newTab.setAttribute('onclick', `showTab('${newTabId}')`);
    document.querySelector('.add-tab').before(newTab);
    const newTabContent = document.createElement('div');
    newTabContent.id = newTabId;
    newTabContent.className = 'tab-content';
    newTabContent.innerHTML = `
      
      
        
        
      
      
        
      
      
        
      
    `;
  document.body.appendChild(newTabContent);
}

function browse(tabId) {
  const searchInput = document.getElementById(`${tabId}-search-input`);
  const iframe = document.getElementById(`${tabId}-iframe`);
  const inputValue = searchInput.value.trim();
    if (!inputValue) return;
    const isUrl = /^https?:\/\//i.test(inputValue);
    let fetchUrl;

    if (isUrl) {
      if (inputValue.includes('youtube.com/watch')) {
        const videoId = new URL(inputValue).searchParams.get('v');
        fetchUrl = `https://www.youtube.com/embed/${videoId}`;
      } else {
        fetchUrl = `/urls?url=${encodeURIComponent(inputValue)}`;
      }
    } else {
      fetchUrl = `/search?q=${encodeURIComponent(inputValue)}`;
    }

  console.log('Fetching URL:', fetchUrl);
  iframe.style.display = 'block';
  iframe.src = fetchUrl;
}


document.addEventListener("keydown", function (event) {
  if (event.key === "Enter") {
    const activeTab = document.querySelector('.tab-content.active');
    const activeTabId = activeTab.id;
    browse(activeTabId);
  }
});

Index.html:




 
 
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Why is my proxy displaying, "You are not connected to the Internet?"

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