Nginx HTTP Server - Fourth Edition

Conditional structure

The Rewrite module introduces a new set of directives and blocks, among which is the if conditional structure:

server { 
    if ($request_method = POST) { 
      [...] 
    } 
}

This offers the possibility to apply a configuration according to the specified condition. If the condition is true, the configuration is applied; otherwise, it isn't.

The following table describes the various syntaxes accepted when forming a condition:

Operator	Description
None	The condition is true if the specified variable or data is not equal to an empty string or a string starting with the character 0: if ($string) { [...] }
=, !=	The condition is true if the argument preceding the = symbol is equal to the argument following it. The following ...