使用.htaccess文件會對Web服務器性能產生負面影響，尤其在高頻訪問或配置不當?shù)那闆r下。主要問題在于每次請求都會讀取.htaccess文件，相比直接寫入主配置文件（如httpd.conf）的指令，會增加額外開銷。具體表現(xiàn)為：1. Apache在每次請求中都會查找目錄中的.htaccess文件，即使不存在也會進行搜索，導致更多磁盤I/O，影響響應速度；2. .htaccess中的規(guī)則在每次請求時都會重新解析和執(zhí)行，包括URL重寫、身份驗證、重定向等，而主配置文件中的指令僅在啟動或重載Apache時解析一次；3. 為提升性能，應將規(guī)則移至主配置的塊中，并通過設置AllowOverride None禁用.htaccess文件的使用，從而減少運行時解析負擔。盡管.htaccess便于共享主機用戶快速調整配置，但在可控服務器環(huán)境下，為優(yōu)化性能，建議將其規(guī)則遷移至主配置文件并重啟Apache生效。

Using .htaccess files can have a performance impact on your web server, especially if they're used heavily or improperly. The main issue is that .htaccess files are read on every request, which adds overhead compared to configuration directives placed directly in the main server config (like httpd.conf or virtual host files).

Here’s how it breaks down:

Apache has to look for .htaccess files on every request

By default, Apache checks each directory in the path of a requested file for a .htaccess file. Even if you don’t have one, this search still happens. This means more disk I/O and slower response times—especially if your site uses deep directory structures.

If you’re using .htaccess files across many directories, and you get a lot of traffic, this overhead can add up. You can reduce it by setting AllowOverride None in your server config and moving all rules to the main configuration.

Rules in .htaccess are processed repeatedly

Unlike directives in the main server config, which are compiled once when Apache starts or reloads, .htaccess rules are re-read and reprocessed with every request. That means:

• URL rewriting done in .htaccess runs each time
• Authentication settings are reloaded per request
• Redirects and MIME types are reapplied over and over

This repeated processing isn't a huge hit on small sites, but on busier ones, it's better to move these rules into the main config where they’re only parsed once.

It's convenient but not ideal for performance-focused setups

The big reason people use .htaccess is convenience—especially in shared hosting environments where they don’t have access to the main server config. It lets users tweak settings without needing server-level access.

But if you control your server and care about performance, it's better to:

• Move rewrite rules to <directory></directory> blocks in the main config
• Disable .htaccess usage with AllowOverride None
• Reload Apache after changes instead of relying on runtime parsing

This gives you cleaner config management and faster request handling.

基本上就這些。.htaccess works fine for small sites or quick fixes, but if you're optimizing for speed and scalability, it's worth moving those settings into the main server configuration.

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