App Server Context

Table of Contents

App Server Context

URI | Location | Binary Path | Application Type | Startup File | Run-time Mode | Max Connections | Environment | Enable Expires | Expires Default | Expires By Type | Header Operations | Index Files | Auto Index | Realm | Authentication Name | Require (Authorized Users/Groups) | Access Allowed | Access Denied | Authorizer | Enable Rewrite | Rewrite Inherit | Rewrite Base | Rewrite Rules | Add Default Charset | Customized Default Charset | Enable GeoLocation Lookup

App Server Context

Description

An App Server Context provides an easy way to configure a Ruby Rack/Rails, WSGI, or Node.js application. To add a an application through an App Server Context, only mounting the URL and the application's root directory is required. There is no need to go through all the trouble to define an external application, add a 404 handler, and rewrite rules, etc.

URI

Description

Specifies the URI for this context.

Syntax

The URI can be a plain URI (starting with "/") or a Perl compatible regular expression URI (starting with "exp:"). If a plain URI ends with a "/", then this context will include all sub-URIs under this URI. If the context maps to a directory on the file system, a trailing "/" must be added.

See Also

Location

Location

Description

Specifies the corresponding location of this context in the file system.

Default value: $DOC_ROOT + URI

Syntax

It can be an absolute path or path relative to $SERVER_ROOT, $VH_ROOT, or $DOC_ROOT. $DOC_ROOT is the default relative path, and can be omitted.

If the URI is a regular expression, then the matched sub-string can be used to form the "Root" string. The matched sub-string can be referenced with the values "$1" - "$9". "$0" and "&" can be used to reference the whole matched string. Additionally, a query string can be set by appending a "?" followed by the query string. Be careful. "&" should be escaped as "\&" in the query string.

Example

A plain URI like /examples/ with Location set to /home/john/web_examples will map the request "/examples/foo/bar.html" to file "/home/john/web_examples/foo/bar.html".
To simulate Apache's mod_userdir, set URI to exp: ^/~([A-Za-z0-9]+)(.*), set Location to /home/$1/public_html$2. With these settings, a request of URI /~john/foo/bar.html will map to file /home/john/public_html/foo/bar.html.

See Also

URI

Binary Path

Description

The location of the App Server application binary.

Application Type

Description

The type of application used for this context. Rack/Rails, WSGI, or Node.js are supported.

Startup File

Description

The location of file used to start the application.

Run-time Mode

Description

Specifies which mode the app server will be running as: "Development", "Production", or "Staging". The default is "Production".

Syntax

Select from drop down list

Max Connections

Description

Specifies the maximum number of concurrent connections that can be established between the server and an external application. This setting controls how many requests can be processed concurrently by an external application, however, the real limit also depends on the external application itself. Setting this value higher will not help if the external application is not fast enough or cannot scale to a large number of concurrent requests.

Syntax

Integer number

Tips

Setting a high value does not directly translate to higher performance. Setting the limit to a value that will not overload the external application will provide the best performance/throughput.

Environment

Description

Specifies extra environment variables for the external application.

Syntax

Key=value. Multiple variables can be separated by "ENTER"

Enable Expires

Description

Specifies whether to generate an Expires header for static files. If enabled, an Expires header will be generated based on Expires Default and Expires By Type.

This can be set at server, virtual host and context level. Lower level settings will override higher level ones, i.e. context settings will override virtual host settings and virtual host settings will override server settings.

Syntax

Select from radio box

Expires Default

Description

Specifies default settings for Expires header generation. This setting takes effect when Enable Expires is set to "Yes". It can be overridden by Expires By Type. Do not set this default at the server or virtual host level unless you have to, since it will generate Expires headers for all pages. Most of time this should be set at the context level for certain directories that do not change often. If there is no default setting, no Expires header will be generated for types not specified in Expires By Type.

Syntax

A|Mseconds
The file will expire after base time(A|M) plus specified seconds. Base time "A" sets the value to the client's access time and "M" to the file's last modified time.

Expires By Type

Description

Specifies Expires header settings for individual MIME types.

Syntax

Comma delimited list of "MIME-type=A|Mseconds". The file will expire after base time (A|M) plus specified seconds.

Base time "A" sets the value to the client's access time and "M" to the file's last modified time. MIME-type accepts wildcard "*", like image/*.

Header Operations

Description

Specifies additional response/request headers to be added. Multiple header directives can be added with one directive per line. "NONE" can be used to disable parent header inheritance. If no directive is provided 'Header' is assumed.

Syntax

[Header]|RequestHeader [condition] set|append|merge|add|unset header [value] [early|env=[!]variable]

Example

set Cache-control no-cache
append Cache-control no-store
Header set My-header cust_header_val
RequestHeader set My-req-header cust_req_header_val

Tips

Syntax and usage are similar to Apache's mod_headers directives for supported operations.

The 'Header' directive is is optional and can be excluded or left in when copying rules from elsewhere without issue.

Index Files

Description

Specifies names of index files that will be searched sequentially when a URL is mapped to a directory. You can customize it at the server, virtual host, and context level.

Syntax

Comma-delimited list of index filenames.

Tips

Only set index files that you need.

Auto Index

Description

Specifies whether to generate a directory index on the fly when index files listed in Index Files are not available in a directory. This option is customizable at the virtual host and context level, and is inherited along the directory tree until it is explicitly overridden. You can customize the generated index page. Please check online wiki How-tos.

Syntax

Select from radio box

Tips

It is recommended to turn off Auto Index wherever possible to prevent revealing confidential data.

See Also

Index Files, Auto Index URI

Realm

Description

Specifies the authorization realm for this context. When specified, a valid username and password must be provided in order to access this context. Authorization Realms are set up in the Virtual Host Security section. This setting uses each realm's Realm Name.

Syntax

Select from drop down list

Authentication Name

Description

Specifies an alternative name for the authorization realm for the current context. If not specified, the original realm name will be used. The authentication name is displayed on the browser's login pop-up.

Require (Authorized Users/Groups)

Description

Specifies which user/group can access this context. This allows you to use one user/group database (specified in Realm) across a number of contexts, but only allow certain users/groups from that database to access this context.

Syntax

Syntax is compatible with Apache's Require directive. For example:

  • user username [username ...]
    Only listed users can access this context.
  • group groupid [groupid ...]
    Only users belonging to the listed groups can access this context.
If this setting is not specified, all valid users will be allowed to access this resource.

Access Allowed

Description

Specifies which IPs or sub-networks are allowed to access resources under this context. Together with Access Denied and server/virtual host level access control, accessibility is determined by the smallest scope that a client's IP address falls into.

Syntax

Comma-delimited list of IPs/sub-networks.

Example

Sub-networks can be written as 192.168.1.0/255.255.255.0, 192.168.1, or 192.168.1.*.

Access Denied

Description

Specifies which IPs or sub-networks are NOT allowed to access resources under this context. Together with Access Allowed and server/virtual host-level access control, accessibility is determined by the smallest scope that a client's IP address falls into.

Syntax

Comma-delimited list of IPs/sub-networks.

Example

Sub-networks can be written as 192.168.1.0/255.255.255.0, 192.168.1, or 192.168.1.*.

Authorizer

Description

Specifies an external application that can be used to generate authorized/unauthorized decisions. Currently, only the FastCGI Authorizer is available. For more details about the FastCGI Authorizer role, please visit http://www.fastcgi.com.

Syntax

Select from drop down list

Enable Rewrite

Description

Specifies whether to enable LiteSpeed's URL rewrite engine. This option can be customized at the virtual host or context level, and is inherited along the directory tree until it is explicitly overridden.

Syntax

Select from radio box

Rewrite Inherit

Description

Specifies whether to inherit rewrite rules from parent contexts. If rewrite is enabled and not inherited, rewrite base and rewrite rules defined in this context will be used.

Syntax

Select from radio box

Rewrite Base

Description

Specifies the base URL for rewrite rules.

Syntax

URL

Rewrite Rules

Description

Specifies a list of rewrite rules at the virtual host level.

Do NOT add any document root level rewrite rules here. If you have any document root level rewrite rules from .htaccess, you should instead create a static context with uri "/" and add the rewrite rules there.

A rewrite rule is comprised of one RewriteRule directive and optionally preceded by multiple RewriteCond directives.

  • Each directive should take only one line.
  • RewriteCond and RewriteRule follow Apache's rewrite directive syntax. Just copy and paste rewrite directives from your Apache configuration files.
  • There are minor differences between LiteSpeed and Apache mod_rewrite implementation:
    • %\{LA-U:variable\} and %\{LA-F:variable\} are ignored by the LiteSpeed rewrite engine
    • two new server variables are added in the LiteSpeed rewrite engine: %\{CURRENT_URI\} represents the current URI being processed by the rewrite engine and %\{SCRIPT_NAME\} has the same meaning as the corresponding CGI environment variable.
The implementation of LiteSpeed's rewrite engine follows the Apache's rewrite engine specifications. For more details about rewrite rules, please refer to Apache's mod_rewrite document and Apache's URL rewriting guide.

Syntax

string

Add Default Charset

Description

Specifies whether to add a character set tag to the "Content-Type" response header, when content type is either "text/html" or "text/plain" without any parameters. When set to Off, this function is disabled. When set to On, either the character set specified by Customized Default Charset or the default "iso-8859-1" will be added.

Syntax

Select from radio box

Customized Default Charset

Description

Specifies a character set to be used when Add Default Charset is On. This is optional. The default value is iso-8859-1. This entry has no effect when Add Default Charset is Off.

Syntax

Name of a character set.

Example

utf-8

Enable GeoLocation Lookup

Description

Specifies whether to enable/disable IP Geolocation lookup. Can be set at server, virtual host, or context level. IP Geolocation is disabled by default when using value "Not Set".

Syntax

Select from radio box

See Also

Use Client IP in Header, DB File Path,