An absolute URL to the root of the application. Do not include trailing slash.

Default value: ApprootRelative. This is valid under the following conditions:

• Your application is served from the root of the domain.
• You do not use any features that require absolute URLs, such as Atom feeds and XML sitemaps.

If this is not true, you should override with a different implementation.

Output error response pages.

Applies some form of layout to the contents of a page.

Override the rendering function for a particular URL. One use case for this is to offload static hosting to a different domain name to avoid sending cookies.

Determine if a request is authorized or not.

Return Authorized if the request is authorized, Unauthorized a message if unauthorized. If authentication is required, return AuthenticationRequired.

Determines whether the current request is a write request. By default, this assumes you are following RESTful principles, and determines this from request method. In particular, all except the following request methods are considered write: GET HEAD OPTIONS TRACE.

This function is used to determine if a request is authorized; see isAuthorized.

The default route for authentication.

Used in particular by isAuthorized, but library users can do whatever they want with it.

A function used to clean up path segments. It returns Right with a clean path or Left with a new set of pieces the user should be redirected to. The default implementation enforces:

• No double slashes
• There is no trailing slash.

Note that versions of Yesod prior to 0.7 used a different set of rules involing trailing slashes.

Builds an absolute URL by concatenating the application root with the pieces of a path and a query string, if any. Note that the pieces of the path have been previously cleaned up by cleanPath.

This function is used to store some static content to be served as an external file. The most common case of this is stashing CSS and JavaScript content in an external file; the Yesod.Widget module uses this feature.

The return value is Nothing if no storing was performed; this is the default implementation. A Just Left gives the absolute URL of the file, whereas a Just Right gives the type-safe URL. The former is necessary when you are serving the content outside the context of a Yesod application, such as via memcached.

The path value to set for cookies. By default, uses "/", meaning cookies will be sent to every page on the current domain.

The domain value to set for cookies. By default, the domain is not set, meaning cookies will be sent only to the current domain.

Maximum allowed length of the request body, in bytes.

Default: 2 megabytes.

Returns a Logger to use for log messages.

Default: Sends to stdout and automatically flushes on each write.

Send a message to the Logger provided by getLogger.

The logging level in place for this application. Any messages below this level will simply be ignored.

GZIP settings.

Where to Load sripts from. We recommend the default value, BottomOfBody. Alternatively use the built in async yepnope loader:

 BottomOfHeadAsync $ loadJsYepnope $ Right $ StaticR js_modernizr_js

Or write your own async js loader: see loadJsYepnope

Create a session backend. Returning Nothing disables sessions.

Default: Uses clientsession with a 2 hour timeout.

How to store uploaded files.

Default: Whe nthe request body is greater than 50kb, store in a temp file. Otherwise, store in memory.

Returns the title and the parent resource, if available. If you return a Nothing, then this is considered a top-level page.