Mobile adaptation and URL pairing

Where a site keeps separate PC and mobile versions, Baidu needs to know which mobile URL corresponds to which PC URL. That declared relationship is mobile adaptation, and it is submitted through the Search Resource Platform.

Why it matters

Without it, the two versions are unrelated documents competing with each other, and a mobile searcher may be sent to the PC page — which fails the landing-page standard by itself. With it, Baidu substitutes the mobile URL in mobile results and consolidates the signals.

The three adaptation methods

• Rule-based adaptation — a pattern that transforms PC URLs into mobile URLs. Efficient where the structures correspond exactly; brittle where they do not.
• URL pair submission — an explicit list of PC-to-mobile pairs. Laborious and exact.
• Meta annotation — declaring the relationship in the page itself.

Responsive sites need none of this: one URL serves both, and Baidu prefers that arrangement precisely because there is nothing to declare and nothing to break.

Why validation fails — the common causes

• The mobile page is not indexed. Adaptation cannot be validated against a page Baidu does not have; this is the single most frequent cause and it is often mistaken for a rule error.
• The rule produces URLs that do not resolve, or resolve to the wrong page.
• The pairs are not genuine equivalents — several PC pages mapped to one mobile page, or a mapping to the mobile home page.
• The mobile page is blocked, redirects, or does not answer 200 for the mobile spider.

The structural advice

If the site is being rebuilt anyway, build it responsive and remove this whole category of work. Separate mobile sites require the adaptation relationship to be maintained for every URL, forever, and it silently breaks whenever the URL structure on either side changes.

Checking

Confirm the mobile page is indexed first, then validate the relationship, then verify in the console that mobile results are showing the mobile URL. Skipping the first step produces a validation failure with a misleading cause.