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This module defines a generic web application interface. It is a common protocol between web servers and web applications. The overriding design principles here are performance and generality. To address performance, this library uses a streaming interface for request and response bodies, paired with bytestring's Builder type. The advantages of a streaming API over lazy IO have been debated elsewhere and so will not be addressed here. However, helper functions like responseLBS allow you to continue using lazy IO if you so desire. Generality is achieved by removing many variables commonly found in similar projects that are not universal to all servers. The goal is that the Request object contains only data which is meaningful in all circumstances. Please remember when using this package that, while your application may compile without a hitch against many different servers, there are other considerations to be taken when moving to a new backend. For example, if you transfer from a CGI application to a FastCGI one, you might suddenly find you have a memory leak. Conversely, a FastCGI application would be well served to preload all templates from disk when first starting; this would kill the performance of a CGI application. This package purposely provides very little functionality. You can find various middlewares, backends and utilities on Hackage. Some of the most commonly used include:
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