What are some of the most widely used web server frameworks in Rust?
Some of the most widely used web server frameworks in Rust were:

1. **Actix**: Actix is a powerful and popular asynchronous web framework in Rust. It is designed for building highly concurrent and scalable applications. Actix provides support for features such as middleware, routing, request handling, and WebSocket communication.

2. **Rocket**: Rocket is a web framework that aims to make web development in Rust both simple and fast. It emphasizes ease of use and comes with a variety of features like request routing, templating, and static file serving.

3. **Warp**: Warp is another asynchronous web framework for Rust that is known for its high performance. It leverages Rust's async/await feature to handle concurrent requests efficiently. Warp focuses on providing a composable and expressive API for building web applications.

4. **Tide**: Tide is a minimalistic and expressive web framework that is built on top of the async-std runtime. It aims to provide a flexible and ergonomic API for building web applications in Rust.

5. **Hyper**: Hyper is not a full-fledged web framework but rather a low-level HTTP library for Rust. It is widely used in combination with other libraries or frameworks to handle low-level HTTP communication.

6. **Gotham**: Gotham is a flexible web framework that is designed with performance and modularity in mind. It provides a range of features such as routing, middleware, and extensible request/response handling.

For the most up-to-date information, I recommend checking the Rust community forums, repositories on GitHub, or the official Rust website.
Can you tell me more about 5?
Sure. Hyper is a low-level HTTP library for Rust. It is not a full-fledged web framework, but rather a building block that can be used to create web frameworks. Hyper provides a number of features, such as:

* Handling HTTP requests and responses
* Parsing and serializing HTTP headers and bodies
* Working with HTTP cookies
* Supporting HTTP/1.1 and HTTP/2
* Using TLS/SSL for secure connections

Hyper is a popular choice for building web frameworks because it is fast, efficient, and well-documented. It is also a good choice for developers who want to have more control over the low-level details of their web applications.

Here are some of the benefits of using Hyper:

* Speed: Hyper is one of the fastest HTTP libraries available in Rust. This is because it is written in Rust, which is a compiled language that is known for its performance.
* Efficiency: Hyper is also very efficient in terms of memory usage. This is because it uses a non-blocking event loop, which allows it to handle multiple requests concurrently without using up too much memory.
* Documentation: Hyper is well-documented, which makes it easy to learn and use. The documentation includes tutorials, examples, and API reference.
* Control: Hyper gives developers a lot of control over the low-level details of their web applications. This can be beneficial for developers who want to fine-tune the performance or security of their applications.

Here are some of the drawbacks of using Hyper:

* Complexity: Hyper is a complex library, which can make it difficult to learn and use. This is especially true for developers who are new to Rust or web development.
* Lack of features: Hyper is a low-level library, so it does not provide all of the features that are typically found in a web framework. For example, Hyper does not provide any support for routing or templating.
* Dependency: Hyper is a dependency of many other web frameworks, so if you are using Hyper, you will also need to install the frameworks that depend on it.

Overall, Hyper is a powerful and versatile HTTP library that can be used to build a variety of web applications. It is a good choice for developers who want to have more control over the low-level details of their applications and who are willing to put in the effort to learn how to use it.

Would you like to know more about Hyper or any other web server frameworks in Rust?