没有 www 重定向会影响 google/bing seo 吗？
如果我的网站仅响应 www.example.com，而不响应 example.com，这会影响搜索排名吗？我还没有找到任何主要搜索引擎来证实或否认这一点，我很好奇。
If my website only responds to www.example.com, and not example.com, does this affect search rankings at all? I haven't found anything to confirm or deny this for any major search engine, and I'm curious.
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我不久前读过 ScottGuthrie 写的一篇与 IIS SEO Toolkit 相关的文章 - 要点如下：
您的网站可能遇到的 4 个真正常见的 SEO 问题
下面是 4 个真正常见的情况，这些情况可能会导致您的网站无意中暴露多个问题相同内容的 URL。当这种情况发生时，链接到您网站的外部网站最终会将其页面链接拆分为多个 URL，从而导致您在搜索引擎中的页面排名低于应有的排名。
SEO 问题#1：默认文档
IIS（和其他 Web 服务器）支持“默认文档”的概念。这使您不必在网站/应用程序的根目录或子目录中显式指定要提供服务的页面。这很方便，但意味着默认情况下可以通过两个不同的公开 URL 访问此内容（这很糟糕）。例如：
SEO 问题 #2：不同的 URL 大小写
Web 开发人员通常没有意识到 URL 对于 Web 搜索引擎来说是区分大小写的。这意味着搜索引擎会将以下链接视为两个完全不同的 URL：
SEO 问题 #3：尾部斜杠
考虑以下两个 URL – 它们乍一看可能相同，但它们有细微的不同。尾部斜杠又造成了另一种情况，导致搜索引擎将 URL 视为不同的，从而分割搜索排名：
SEO 问题 #4：规范主机名
有时，网站支持同时具有前导“www”主机名的网站的情况前缀以及主机名本身。这会导致搜索引擎将 URL 视为不同的并分割搜索排名：
完整文章位于 http://weblogs.asp.net/scottgu/archive/2010/04/20/tip-trick-fix-使用-url-rewrite-extension.aspx 的常见 seo 问题
i was reading an article on this a while back from ScottGuthrie that relates to IIS SEO Toolkit - the main points are as follows:
4 Really Common SEO Problems Your Sites Might Have
Below are 4 really common scenarios that can cause your site to inadvertently expose multiple URLs for the same content. When this happens external sites linking to yours will end up splitting their page links across multiple URLs - and as a result cause you to have a lower page ranking with search engines than you deserve.
SEO Problem #1: Default Document
IIS (and other web servers) supports the concept of a “default document”. This allows you to avoid having to explicitly specify the page you want to serve at either the root of the web-site/application, or within a sub-directory. This is convenient – but means that by default this content is available via two different publically exposed URLs (which is bad). For example:
SEO Problem #2: Different URL Casings
Web developers often don’t realize URLs are case sensitive to search engines on the web. This means that search engines will treat the following links as two completely different URLs:
SEO Problem #3: Trailing Slashes
Consider the below two URLs – they might look the same at first, but they are subtly different. The trailing slash creates yet another situation that causes search engines to treat the URLs as different and so split search rankings:
SEO Problem #4: Canonical Host Names
Sometimes sites support scenarios where they support a web-site with both a leading “www” hostname prefix as well as just the hostname itself. This causes search engines to treat the URLs as different and split search rankling:
full article at http://weblogs.asp.net/scottgu/archive/2010/04/20/tip-trick-fix-common-seo-problems-using-the-url-rewrite-extension.aspx
Google 将
www.example.com和example.com视为两个独立的域（因为“www”在技术上是一个子域）。只要您不混合和匹配链接，即某些链接指向example.com而另一些链接指向www.example.com，就 SEO 而言，两者并不比另一个更好。。如果您没有从一个子域到另一个子域的任何重定向，则进入该网站的链接（以及访问者流量）可能会在两个子域之间分配，这实际上意味着您在搜索引擎排名中与自己竞争。选择一个（
example.com或www.example.com），然后在另一个域上设置重定向，和/或添加规范链接可能是个好主意页面，以便搜索引擎知道这些页面应被视为同一站点。请参阅此处，了解有关 www 链接和非 www 链接中规范链接的更多信息。
Google treats
www.example.comandexample.comas two separate domains (since 'www' is technically a sub-domain). Neither is better than the other in terms of SEO, as long as you don't mix and match links - i.e. some links point toexample.comwhile others point towww.example.com.If you don't have any redirects from one to the other, then links into the site (and so visitor traffic) may be split between the two sub-domains, effectively meaning you're competing with yourself in search engine rankings. It's probably a good idea to pick one (either
example.comorwww.example.com) then set up redirects on the other domain, and/or add canonical links to pages so that search engines know that the pages should be treated as the same site.See here for more on canonical links in www vs non-www links.