[](https://hex.pm/packages/wisp)
[](https://hexdocs.pm/wisp/)
Wisp is a practical Gleam web framework rapid development and easy maintenance.
We worry about the hassle of web development, and you focus on writing your
application.
It is based around two concepts: handlers and middleware.
# Handlers
A handler is a function that takes a HTTP request and returns a HTTP
response. A handler may also take other arguments, such as a "context" type
defined in your application which may hold other state such as a database
connection or user session.
```gleam
import wisp.{Request, Response}
pub type Context {
Context(secret: String)
}
pub fn handle_request(request: Request, context: Context) -> Response {
wisp.ok()
}
```
# Middleware
A middleware is a function that takes a response returning function as its
last argument, and itself returns a response. As with handlers both
middleware and the functions they take as an argument may take other
arguments.
Middleware can be applied in a handler with Gleam's `use` syntax. Here the
`log_request` middleware is used to log a message for each HTTP request
handled, and the `serve_static` middleware is used to serve static files
such as images and CSS.
```gleam
import wisp.{Request, Response}
pub fn handle_request(request: Request) -> Response {
use <- wisp.log_request
use <- wisp.serve_static(request, under: "/static", from: "/public")
wisp.ok()
}
```
# Learning Wisp
The Wisp examples are a good place to start. They cover various scenarios and
include comments and tests.
- [Hello, World!](https://github.com/lpil/wisp/tree/main/examples/0-hello-world)
- [Routing](https://github.com/lpil/wisp/tree/main/examples/1-routing)
- [Working with form data](https://github.com/lpil/wisp/tree/main/examples/2-working-with-form-data)
- [Working with JSON](https://github.com/lpil/wisp/tree/main/examples/3-working-with-json)
- [Working with other formats](https://github.com/lpil/wisp/tree/main/examples/4-working-with-other-formats)
- [Using a database](https://github.com/lpil/wisp/tree/main/examples/5-using-a-database)
- [Serving static assets](https://github.com/lpil/wisp/tree/main/examples/6-serving-static-assets)
- [Logging](https://github.com/lpil/wisp/tree/main/examples/7-logging)
- [Working with cookies](https://github.com/lpil/wisp/tree/main/examples/8-working-with-cookies)
- [Configuring default responses](https://github.com/lpil/wisp/tree/main/examples/9-configuring-default-responses)
API documentation is available on [HexDocs](https://hexdocs.pm/wisp/).
# Wisp applications
These open source Wisp applications may be useful examples.
- [https://packages.gleam.run/](https://github.com/gleam-lang/packages): A HTML
serving application that uses an SQLite + LiteFS database, deployed to Fly.io.
