Apache HTTP Server Version 2.5

Apache > HTTP Server > Documentation > Version 2.5 > Modules

# Apache Module mod_info

Description: | Provides a comprehensive overview of the server configuration
Status: | Extension
Module Identifier: | info_module
Source File: | mod_info.c

### Summary

To configure `mod_info`, add the following to your `httpd.conf` file.

    <Location "/server-info">
        SetHandler server-info
    </Location>

You may wish to use `mod_authz_host` inside the `<Location>` directive to limit access to your server configuration information:

    <Location "/server-info">
        SetHandler server-info
        Require host example.com
    </Location>

Once configured, the server information is obtained by accessing `http://your.host.example.com/server-info`

### Topics

- Security Issues
- Selecting the information shown
- Dumping the configuration on startup
- Known Limitations

### Directives

### Bugfix checklist

- httpd changelog
- Known issues
- Report a bug

## Security Issues ¶

Once `mod_info` is loaded into the server, its handler capability is available in all configuration files, including per-directory files (e.g., `.htaccess`). This may have security-related ramifications for your site.

In particular, this module can leak sensitive information from the configuration directives of other Apache modules such as system paths, usernames/passwords, database names, etc. Therefore, this module should only be used in a controlled environment and always with caution.

You will probably want to use `mod_authz_host` to limit access to your server configuration information.

### Access control

    <Location "/server-info">
        SetHandler server-info
        # Allow access from server itself
        Require ip 127.0.0.1

        # Additionally, allow access from local workstation
        Require ip 192.168.1.17
    </Location>

## Selecting the information shown ¶

By default, the server information includes a list of all enabled modules, and for each module, a description of the directives understood by that module, the hooks implemented by that module, and the relevant directives from the current configuration.

Other views of the configuration information are available by appending a query to the `server-info` request. For example, `http://your.host.example.com/server-info?config` will show all configuration directives.

`?<module-name>`
  Only information relevant to the named module
`?config`
  Just the configuration directives, not sorted by module
`?hooks`
  Only the list of Hooks each module is attached to
`?list`
  Only a simple list of enabled modules
`?server`
  Only the basic server information
`?providers`
  List the providers that are available on your server

## Dumping the configuration on startup ¶

If the config define `-DDUMP_CONFIG` is set, `mod_info` will dump the pre-parsed configuration to `stdout` during server startup.

    httpd -DDUMP_CONFIG -k start

Pre-parsed means that directives like `<IfDefine>` and `<IfModule>` are evaluated and environment variables are replaced. However it does not represent the final state of the configuration. In particular, it does not represent the merging or overriding that may happen for repeated directives.

This is roughly equivalent to the `?config` query.

## Known Limitations ¶

`mod_info` provides its information by reading the parsed configuration, rather than reading the original configuration file. There are a few limitations as a result of the way the parsed configuration tree is created:

- Directives which are executed immediately rather than being stored in the parsed configuration are not listed. These include `ServerRoot`, `LoadModule`, and `LoadFile`.
- Directives which control the configuration file itself, such as `Include`, `<IfModule>` and `<IfDefine>` are not listed, but the included configuration directives are.
- Comments are not listed. (This may be considered a feature.)
- Configuration directives from `.htaccess` files are not listed (since they do not form part of the permanent server configuration).
- Container directives such as `<Directory>` are listed normally, but `mod_info` cannot figure out the line number for the closing `</Directory>`.
- Directives generated by third party modules such as mod_perl might not be listed.

## AddModuleInfo Directive ¶

Description: | Adds additional information to the module information displayed by the server-info handler
Syntax: | `AddModuleInfo module-name string`
Context: | server config, virtual host
Status: | Extension
Module: | mod_info

This allows the content of string to be shown as HTML interpreted, Additional Information for the module module-name. Example:

    AddModuleInfo mod_deflate.c 'See <a \
        href="http://httpd.apache.org/docs/trunk/mod/mod_deflate.html">\
        http://httpd.apache.org/docs/trunk/mod/mod_deflate.html</a>'