To WWW or Not to WWW: The Ultimate Guide

Many websites have dropped the www prefix in pursuit of a cleaner look, with GitHub being a prime example. The old notion that apex domains (naked domains) hold higher SEO authority is long gone. Today, the standard practice is simply to use a 301 redirect to consolidate link equity between the www and naked domain versions. For search engine crawlers like Google, there is no longer any difference.

Google Chrome also hides the www prefix by default. However, putting aside historical baggage, whether you should strip it away depends entirely on your specific needs and goals. Using my own websites, hudd.cn and my international site hudd.me, as examples, let’s clear this up once and for all.

The Core Technical Difference

Many sites have already covered the origin of the www prefix, so I won’t rehash that here. You can look it up if you're curious.

From a technical standpoint, the core difference lies in internet standards: international protocols dictate that an apex domain (e.g., hudd.cn) can only use an A record to bind directly to an IP address; it cannot use a CNAME record. While some technically immature platforms allow you to force-set a CNAME on an apex domain, doing so often triggers conflicts with your MX records, causing email services to become unstable.

On the flip side, the www prefix behaves just like any other custom subdomain—meaning it can seamlessly support CNAME records. Additionally, cookies set on an apex domain will cascade down across the entire site, meaning any requests to subdomains will carry the apex domain's cookies along with them.

Choosing Your Setup: To WWW or Not?

With 301 redirects and modern browsers hiding prefixes, users usually see the naked domain anyway. For instance, even if a user types in www.hudd.cn, the browser address bar will likely just display hudd.cn.

Therefore, deciding whether to use www boils down to your future technical architecture—specifically, whether you will need CNAME functionality on your main domain address, a requirement driven almost entirely by CDN (Content Delivery Network) routing.

1. No CDN Implemented

• Recommendation: Drop the www.
• Why: If you aren't routing traffic through a CDN proxy, you won’t need CNAME functionality on your root domain. Leaving the www out keeps things much cleaner.

2. Using Cloudflare Proxy (or DNS Providers with CNAME Flattening / ALIAS Records)

• Recommendation: Drop the www.
• Why: Even though standards dictate that apex domains (hudd.cn) can only point to IP addresses via A records, Cloudflare plays by its own rules. Their system allows you to assign a CNAME record to the root (@) domain. When a browser or web crawler requests the IP for hudd.cn, Cloudflare translates that CNAME into an edge node IP on the backend and returns it as a standard A record to the outside world.
• Result: If your DNS is managed by Cloudflare and you have the orange cloud toggled on (Proxy mode), Cloudflare handles the CDN acceleration seamlessly. This bypasses the traditional CNAME restriction entirely, letting you keep the domain clean and naked. This is exactly why my international site, hudd.me, runs without a www prefix.

3. Domestic CDNs (e.g., Inside Mainland China)

Asset Separation Strategy

The traditional way to use a CDN is to cache static assets like images and JavaScript files. For example, if my main site is hudd.cn, I can set up a separate CDN domain like cdn.hudd.cn and use a CNAME record to point it to a third-party CDN address (such as xxxx.xx.aliyun.com), while the origin server remains bound to hudd.cn. Images on the site are then loaded via paths like cdn.hudd.cn/image.png. This is the classic "main site connects directly to the origin IP, while assets run through the CDN" approach.

• Recommendation: Drop the www.
• Why: Because the CNAME record is applied to a completely separate subdomain (cdn.hudd.cn), your main domain remains unaffected. You can safely ditch the www prefix for a cleaner look.

Full-Site Reverse Proxy Strategy

Many modern CDN architectures operate as full-site proxies, where traffic flows: User $\rightarrow$ CDN Edge Node $\rightarrow$ Origin Server. In this setup, users only interact with the CDN network.

This is where the www prefix becomes essential: you need to point your www record via a CNAME to the third-party CDN server. Your actual origin server is then hidden behind an unpublicized subdomain, such as 520.hudd.cn.

Under this configuration, when users access the www domain, they are hitting the CDN nodes directly. If a resource is missing or expired, the CDN fetches it from the backend origin (520.hudd.cn).

• Pros: Incredible loading speeds and excellent server load protection.
• Cons: Higher costs, since all site traffic—including standard dynamic HTML requests—consumes CDN bandwidth.
• Recommendation: Keep the www.
• Why: You need the CNAME mapping to route traffic to the CDN edge servers. While you can technically force this setup onto a naked domain, doing so requires "CNAME Flattening" services, which are premium, paid features on most domestic DNS providers. And while Cloudflare offers this for free, its routing speeds within mainland China can be slow without a premium enterprise plan.

Summary

Due to the technical limitations of CNAME records on apex domains, the decision matrix can be summarized as follows:

Copyright：Damon胡东东 - hudd.me

Link：https://hudd.me/21.html

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