配置.htaccess实现指向.default.txt指定的默认目录

Got it, let's tackle this .htaccess setup for your versioned app structure. Here's how to make Apache automatically route requests like example.com/apps/app1 to the version specified in .default.txt (e.g., v1.0):

Option 1: Single App (apps/app1 only) #

If you only need this for one specific app, create an .htaccess file directly inside the apps/app1 directory with these rules:

RewriteEngine On

# Read the version from .default.txt and store it in an environment variable
RewriteCond %{DOCUMENT_ROOT}/apps/app1/.default.txt -f
RewriteCond %{DOCUMENT_ROOT}/apps/app1/.default.txt <([^\n]+)>
RewriteRule ^ - [E=APP_VERSION:%1]

# Route requests to the versioned directory if the requested path doesn't exist
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ %{ENV:APP_VERSION}/$1 [L]

How this works: #

• The first two RewriteCond lines check if .default.txt exists, then read its first line (ignoring extra newlines) into the APP_VERSION environment variable.
• The next two conditions skip the rewrite if the requested file/directory already exists (so you can still access things like apps/app1/robots.txt directly if needed).
• The final RewriteRule takes any request to apps/app1/xyz and internally forwards it to apps/app1/{VERSION}/xyz (where {VERSION} is whatever's in .default.txt).

Option 2: Multiple Apps (apps/app1, apps/app2, etc.) #

If you have multiple apps each with their own .default.txt, use this root .htaccess (placed in your website's document root) to handle all of them:

RewriteEngine On

# Capture the app name from the URL and read its .default.txt version
RewriteCond %{REQUEST_URI} ^/apps/([^/]+)/?
RewriteCond %{DOCUMENT_ROOT}/apps/%1/.default.txt -f
RewriteCond %{DOCUMENT_ROOT}/apps/%1/.default.txt <([^\n]+)>
RewriteRule ^ - [E=APP_VERSION:%2]

# Route requests to the correct versioned directory for each app
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^apps/([^/]+)/(.*)$ apps/$1/%{ENV:APP_VERSION}/$2 [L]

How this works: #

• The first RewriteCond captures the app name (e.g., app1) from URLs starting with /apps/.
• The next two conditions validate that the app has a .default.txt file and read its version into APP_VERSION.
• The rewrite rule then maps apps/app1/xyz to apps/app1/{VERSION}/xyz for any non-existent file/directory request.

Important Notes: #

• Permissions: Ensure the .default.txt files have permissions that let Apache read them (usually chmod 644 works).
• mod_rewrite: Double-check that mod_rewrite is enabled in your Apache configuration. If not, uncomment LoadModule rewrite_module modules/mod_rewrite.so and restart Apache.
• External Redirect (Optional): If you want the browser address bar to show the versioned path (instead of internal forwarding), replace the [L] flag with [R=302,L] for testing, then switch to [R=301,L] once you're sure it works (301 is permanent redirect).
• Clean .default.txt: Make sure .default.txt only contains the version string (e.g., v1.0) with no extra spaces or newlines—otherwise the regex might capture unwanted characters.

内容的提问来源于stack exchange，提问作者sirlouis