GoogleMessages
Google •
Web Crawler
What is GoogleMessages?
Google lists GoogleMessages as the fetcher that generates a link preview for a URL sent in a chat message. It is user-triggered, not a crawler building a general search index. Google's documentation says user-triggered fetchers generally ignore robots.txt rules, so a request from this agent should not be interpreted as indexing activity.
User Agent String
GoogleMessages
How to Control GoogleMessages
Block Completely
To prevent GoogleMessages from accessing your entire website, add this to your robots.txt file:
# Block GoogleMessages
User-agent: GoogleMessages
Disallow: /
Block Specific Directories
To restrict access to certain parts of your site while allowing others:
User-agent: GoogleMessages
Disallow: /admin/
Disallow: /private/
Disallow: /wp-admin/
Allow: /public/
Set Crawl Delay
To slow down the crawl rate (note: not all bots respect this directive):
User-agent: GoogleMessages
Crawl-delay: 10
How to Verify GoogleMessages
Verification Method:
Check source IPs against Google's published user-triggered-fetcher ranges; the user-agent string is not proof by itself.
Check source IPs against Google's published user-triggered-fetcher ranges; the user-agent string is not proof by itself.
Learn more in the official documentation.
Detection Patterns
Multiple ways to detect GoogleMessages in your application:
Basic Pattern
/GoogleMessages/i
Strict Pattern
/^GoogleMessages$/
Flexible Pattern
/GoogleMessages[\s\/]?[\d\.]*?/i
Vendor Match
/.*Google.*GoogleMessages/i
Implementation Examples
// PHP Detection for GoogleMessages
function detect_googlemessages() {
$user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
$pattern = '/GoogleMessages/i';
if (preg_match($pattern, $user_agent)) {
// Log the detection
error_log('GoogleMessages detected from IP: ' . $_SERVER['REMOTE_ADDR']);
// Set cache headers
header('Cache-Control: public, max-age=3600');
header('X-Robots-Tag: noarchive');
// Optional: Serve cached version
if (file_exists('cache/' . md5($_SERVER['REQUEST_URI']) . '.html')) {
readfile('cache/' . md5($_SERVER['REQUEST_URI']) . '.html');
exit;
}
return true;
}
return false;
}
# Python/Flask Detection for GoogleMessages
import re
from flask import request, make_response
def detect_googlemessages():
user_agent = request.headers.get('User-Agent', '')
pattern = r'GoogleMessages'
if re.search(pattern, user_agent, re.IGNORECASE):
# Create response with caching
response = make_response()
response.headers['Cache-Control'] = 'public, max-age=3600'
response.headers['X-Robots-Tag'] = 'noarchive'
return True
return False
# Django Middleware
class googlemessagesMiddleware:
def __init__(self, get_response):
self.get_response = get_response
def __call__(self, request):
if self.detect_bot(request):
# Handle bot traffic
pass
return self.get_response(request)
// JavaScript/Node.js Detection for GoogleMessages
const express = require('express');
const app = express();
// Middleware to detect GoogleMessages
function detect_googlemessages(req, res, next) {
const userAgent = req.headers['user-agent'] || '';
const pattern = /GoogleMessages/i;
if (pattern.test(userAgent)) {
// Log bot detection
console.log('GoogleMessages detected from IP:', req.ip);
// Set cache headers
res.set({
'Cache-Control': 'public, max-age=3600',
'X-Robots-Tag': 'noarchive'
});
// Mark request as bot
req.isBot = true;
req.botName = 'GoogleMessages';
}
next();
}
app.use(detect_googlemessages);
# Apache .htaccess rules for GoogleMessages
# Block completely
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} GoogleMessages [NC]
RewriteRule .* - [F,L]
# Or redirect to a static version
RewriteCond %{HTTP_USER_AGENT} GoogleMessages [NC]
RewriteCond %{REQUEST_URI} !^/static/
RewriteRule ^(.*)$ /static/$1 [L]
# Or set environment variable for PHP
SetEnvIfNoCase User-Agent "GoogleMessages" is_bot=1
# Add cache headers for this bot
<If "%{HTTP_USER_AGENT} =~ /GoogleMessages/i">
Header set Cache-Control "public, max-age=3600"
Header set X-Robots-Tag "noarchive"
</If>
# Nginx configuration for GoogleMessages
# Map user agent to variable
map $http_user_agent $is_googlemessages {
default 0;
~*GoogleMessages 1;
}
server {
# Block the bot completely
if ($is_googlemessages) {
return 403;
}
# Or serve cached content
location / {
if ($is_googlemessages) {
root /var/www/cached;
try_files $uri $uri.html $uri/index.html @backend;
}
try_files $uri @backend;
}
# Add headers for bot requests
location @backend {
if ($is_googlemessages) {
add_header Cache-Control "public, max-age=3600";
add_header X-Robots-Tag "noarchive";
}
proxy_pass http://backend;
}
}
Should You Block This Bot?
Recommendations based on your website type:
| Site Type | Recommendation | Reasoning |
|---|---|---|
| E-commerce | Optional | Evaluate based on bandwidth usage vs. benefits |
| Blog/News | Allow | Increases content reach and discoverability |
| SaaS Application | Block | No benefit for application interfaces; preserve resources |
| Documentation | Selective | Allow for public docs, block for internal docs |
| Corporate Site | Limit | Allow for public pages, block sensitive areas like intranets |
Advanced robots.txt Configurations
E-commerce Site Configuration
User-agent: GoogleMessages
Crawl-delay: 5
Disallow: /cart/
Disallow: /checkout/
Disallow: /my-account/
Disallow: /api/
Disallow: /*?sort=
Disallow: /*?filter=
Disallow: /*&page=
Allow: /products/
Allow: /categories/
Sitemap: https://example.com/sitemap.xml
Publishing/Blog Configuration
User-agent: GoogleMessages
Crawl-delay: 10
Disallow: /wp-admin/
Disallow: /drafts/
Disallow: /preview/
Disallow: /*?replytocom=
Allow: /
SaaS/Application Configuration
User-agent: GoogleMessages
Disallow: /app/
Disallow: /api/
Disallow: /dashboard/
Disallow: /settings/
Allow: /
Allow: /pricing/
Allow: /features/
Allow: /docs/
Quick Reference
User Agent Match
GoogleMessages
Robots.txt Name
GoogleMessages
Category
social
Respects robots.txt
May not respect
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