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I just started to use the Play framework and Scala. What does body: => Html mean in the Play framework? Thanks.
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Play's form handling approach is based around the concept of binding data. When data comes in from a POST request, Play will look for formatted values and bind them to a Form object. From there, Play can use the bound form to value a case class with data, call custom validations, and so on.
A Play Scala template is a simple text file that contains small blocks of Scala code. Templates can generate any text-based format, such as HTML, XML or CSV. The template system has been designed to feel comfortable to those used to working with HTML, allowing front-end developers to easily work with the templates.
A play application follows the MVC architectural pattern applied to the Web architecture. This pattern splits the application into separate layers: the Presentation layer and the Model layer. The Presentation layer is further split into a View and a Controller layer.
Play comes with two configurable server backends, which handle the low level work of processing HTTP requests and responses to and from TCP/IP packets. Starting in 2.6. x, the default server backend is the Akka HTTP server backend, based on the Akka-HTTP server. Prior to 2.6.
It's call-by-name parameter
http://ofps.oreilly.com/titles/9780596155957/FunctionalProgramming.html#_call_by_name_call_by_value
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