Created
July 31, 2024 21:30
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Reverse proxy + Redirect GSC Live Test explorer
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| addEventListener('fetch', event => { | |
| event.respondWith(handleRequest(event.request)) | |
| }) | |
| async function handleRequest(request) { | |
| const url = new URL(request.url) | |
| // Serve robots.txt file | |
| if (url.pathname === '/robots.txt') { | |
| return new Response('User-agent: *\nDisallow: ', { | |
| headers: { 'Content-Type': 'text/plain' } | |
| }) | |
| } | |
| // Handle proxy requests | |
| if (url.pathname === '/proxy') { | |
| const targetUrlString = url.searchParams.get('url') | |
| const device = url.searchParams.get('device') | |
| const redirect = url.searchParams.get('redirect') | |
| if (!targetUrlString) { | |
| return new Response('Missing URL parameter', { status: 400 }) | |
| } | |
| try { | |
| // Resolve relative URLs against the current origin | |
| const targetUrl = new URL(targetUrlString, url.origin) | |
| // Check if redirect is true | |
| if (redirect === 'true') { | |
| return Response.redirect(targetUrl.toString(), 302) | |
| } | |
| // If redirect is false or not set, proceed with proxy logic | |
| if (redirect === 'false' || !redirect) { | |
| // Clone the original headers | |
| const newHeaders = new Headers(request.headers) | |
| // Set the appropriate user-agent based on the device parameter | |
| switch(device) { | |
| case 'desktop': | |
| newHeaders.set('User-Agent', 'Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Googlebot/2.1; +http://www.google.com/bot.html) Chrome/116.0.0.0 Safari/537.36') | |
| break; | |
| case 'windows': | |
| newHeaders.set('User-Agent', 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36') | |
| break; | |
| case 'android': | |
| newHeaders.set('User-Agent', 'Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Mobile Safari/537.36') | |
| break; | |
| case 'iphone': | |
| newHeaders.set('User-Agent', 'Mozilla/5.0 (iPhone; CPU iPhone OS 16_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/116.0.5845.118 Mobile/15E148 Safari/604.1') | |
| break; | |
| default: | |
| // Default to smartphone Googlebot if device is not specified or is set to 'mobile' | |
| newHeaders.set('User-Agent', 'Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)') | |
| } | |
| const response = await fetch(targetUrl.toString(), { | |
| method: request.method, | |
| headers: newHeaders, | |
| body: request.body | |
| }) | |
| // Check if the response is HTML | |
| const contentType = response.headers.get('content-type') | |
| if (contentType && contentType.includes('text/html')) { | |
| // If it's HTML, modify the content | |
| let content = await response.text() | |
| content = rewriteUrls(content, targetUrl.toString()) | |
| // Create a new response with the modified content | |
| const newResponse = new Response(content, { | |
| status: response.status, | |
| statusText: response.statusText, | |
| headers: response.headers | |
| }) | |
| // Add CORS headers | |
| newResponse.headers.set('Access-Control-Allow-Origin', '*') | |
| return newResponse | |
| } else { | |
| // If it's not HTML, return the original response | |
| const newResponse = new Response(response.body, response) | |
| // Add CORS headers | |
| newResponse.headers.set('Access-Control-Allow-Origin', '*') | |
| return newResponse | |
| } | |
| } | |
| } catch (error) { | |
| return new Response('Error fetching the requested URL: ' + error.message, { status: 500 }) | |
| } | |
| } | |
| // Return 404 for any other requests | |
| return new Response('Not Found', { status: 404 }) | |
| } | |
| function rewriteUrls(html, baseUrl) { | |
| const baseUrlObj = new URL(baseUrl); | |
| // Function to resolve a URL against the base URL | |
| const resolveUrl = (url) => { | |
| if (url.startsWith('//')) { | |
| return baseUrlObj.protocol + url; | |
| } | |
| if (url.startsWith('/')) { | |
| return baseUrlObj.origin + url; | |
| } | |
| if (!url.startsWith('http://') && !url.startsWith('https://') && !url.startsWith('data:')) { | |
| return new URL(url, baseUrl).href; | |
| } | |
| return url; | |
| }; | |
| // Rewrite URLs in various attributes | |
| html = html.replace(/(?:href|src|content|srcset)=['"]([^'"]+)['"]/gi, (match, url) => { | |
| const newUrl = resolveUrl(url); | |
| return match.replace(url, newUrl); | |
| }); | |
| // Rewrite URLs in inline styles | |
| html = html.replace(/url\(['"]?(.+?)['"]?\)/gi, (match, url) => { | |
| const newUrl = resolveUrl(url); | |
| return `url("${newUrl}")`; | |
| }); | |
| return html; | |
| } |
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