请求编写.htaccess重写规则：子域名重定向至目录及特定页面

Got it, let’s work through those targeted redirects to complement your existing setup. You’ve already nailed the base rule that sends all traffic from fr.example.com to example.com/fr/—now we just need to layer in specific page rules that take priority over that catch-all.

Critical Rule Order Note #

First things first: specific page redirects must come before your general subdomain rule. Apache processes rewrite rules top-to-bottom, so if your catch-all rule is first, it’ll match every request and skip your targeted rules entirely.

Example 1: Redirect a Single Static Page #

Suppose your old French about page at fr.example.com/old-about.html now lives at example.com/fr/a-propos. Add this rule above your existing one:

RewriteCond %{HTTP_HOST} ^fr\.example\.com [NC]
RewriteRule ^old-about\.html$ http://example.com/fr/a-propos [L,R=301]

• ^old-about\.html$: Anchors the rule to match exactly that page (no partial matches, so it won’t trigger for fr.example.com/old-about.html?foo=bar unless you add the QSA flag to preserve query strings)
• [NC]: Makes the host match case-insensitive (so FR.example.com also works)
• [L,R=301]: L stops further rule processing once this matches; R=301 marks it as a permanent redirect (critical for SEO)

Example 2: Redirect a Dynamic Page with Parameters #

If you had a dynamic product page like fr.example.com/product.php?id=123 that’s now at example.com/fr/produits/123, use this:

RewriteCond %{HTTP_HOST} ^fr\.example\.com [NC]
RewriteCond %{QUERY_STRING} ^id=([0-9]+)$
RewriteRule ^product\.php$ http://example.com/fr/produits/%1 [L,R=301,QSD]

• %{QUERY_STRING} ^id=([0-9]+)$: Captures the numeric product ID from the query string
• %1: Inserts the captured ID into the new URL path
• [QSD]: Discards the original query string (since we’ve moved the ID into the path—omit this if you want to keep extra query parameters)

Example 3: Redirect an Entire Directory #

If all old blog pages under fr.example.com/blog/ now live at example.com/fr/blogue/, use a rule that preserves the rest of the path:

RewriteCond %{HTTP_HOST} ^fr\.example\.com [NC]
RewriteRule ^blog/(.*)$ http://example.com/fr/blogue/$1 [L,R=301,QSA]

• (.*): Captures everything after /blog/ (like post-1.html or category/tech)
• $1: Replays that captured content in the new path
• [QSA]: Preserves any query strings from the original request

Full .htaccess Structure #

Putting it all together, your file should look like this (specific rules first, then the catch-all):

RewriteEngine On

# Targeted specific page redirects
RewriteCond %{HTTP_HOST} ^fr\.example\.com [NC]
RewriteRule ^old-about\.html$ http://example.com/fr/a-propos [L,R=301]

RewriteCond %{HTTP_HOST} ^fr\.example\.com [NC]
RewriteCond %{QUERY_STRING} ^id=([0-9]+)$
RewriteRule ^product\.php$ http://example.com/fr/produits/%1 [L,R=301,QSD]

RewriteCond %{HTTP_HOST} ^fr\.example\.com [NC]
RewriteRule ^blog/(.*)$ http://example.com/fr/blogue/$1 [L,R=301,QSA]

# General catch-all redirect for all other pages
RewriteCond %{HTTP_HOST} ^fr\.example\.com [NC]
RewriteRule (.*) http://example.com/fr/$1 [L,R=301]

Quick Pro Tips #

• Always test redirects before deploying! You can check server logs or use browser dev tools to verify the 301 status code and target URL.
• If you have multiple language subdomains (like es.example.com), you can replicate this pattern by swapping fr with the appropriate language code.

内容的提问来源于stack exchange，提问作者Cécile Habran