How to detect X-Accel-Redirect (Nginx) / X-Sendfile (Apache) support in PHP?

Question

About Application

I am working on an e-commerce application in PHP. To keep URL\'s secure, product download links are kept behind PHP. There is a file, say downloa

Answer 1

To detect if the mod_xsendfile apache module installed, you can try this code:

if function_exists('apache_get_modules') 
      && in_array('mod_xsendfile', apache_get_modules()) { 
  header("X-Sendfile"); 
}

But this code just check if the module installed only, that can cause errors if it's installed but configured wrongly

another possible way to do this to setup server-wide variable through Apache's .htaccess:

  
    XSendFile On
    XSendFileAllowAbove On
    SetEnv MOD_X_SENDFILE_ENABLED 1
  

and check it form php code:

if ($_SERVER['MOD_X_SENDFILE_ENABLED']) {
  Header(...)
}

The common idea is the same for nginx - just pass the value of status variable to backend via HTTP-header or CGI/FastCGI variable.