Apache HTTP Server Version 2.4
Apache HTTP Server Version 2.4
Historically, there are several syntax variants for expressions used to express a condition in the different modules of the Apache HTTP Server. There is some ongoing effort to only use a single variant, called ap_expr, for all configuration directives. This document describes the ap_expr expression parser.
The ap_expr expression is intended to replace most other
expression variants in HTTPD. For example, the deprecated SSLRequire expressions can be replaced
by Require expr.
Grammar in Backus-Naur Form notation Variables Binary operators Unary operators Functions Example expressions Other Comparison with SSLRequire Version History<If><ElseIf><Else>ErrorDocumentAliasScriptAliasRedirectAuthBasicFakeAuthFormLoginRequiredLocationAuthFormLoginSuccessLocationAuthFormLogoutLocationAuthNameAuthTypeRewriteCondSetEnvIfExprHeaderRequestHeaderFilterProvider