Rocket Web Framework

Rocket is a leading web framework for the Rust programming language, designed to make it simple to write fast, secure, and type-safe web applications and APIs. It emphasizes developer ergonomics through powerful macros and an intuitive API, while leveraging Rust's performance and memory safety guarantees.

Key features of Rocket include:
* Type-Safe Routing: Routes are defined using declarative macros (e.g., `#[get("/")]`, `#[post("/submit")]`), which ensure compile-time type safety for paths, query parameters, and form data.
* Request Guards: A powerful system for extracting and validating data from incoming requests. Guards allow for clean separation of concerns, handling authentication, authorization, content type negotiation, and custom header parsing.
* Extensible Handlers: Handlers are ordinary Rust functions, making them easy to write and test. They can accept various types as arguments, including path segments, query strings, form data, JSON, and custom request guards.
* Templating: Built-in support for popular templating engines like Tera and Askama, allowing for dynamic HTML generation.
* JSON and Forms: Seamless parsing and generation of JSON payloads and form data, powered by Serde.
* Testing: First-class support for writing integration tests, making it easy to verify application logic without running a full server.
* Asynchronous Nature: Built on top of Tokio, Rocket is fully asynchronous, enabling high concurrency and efficient resource utilization.

Rocket's design philosophy focuses on providing a productive development experience without sacrificing performance or safety. Its macro-driven approach reduces boilerplate and helps developers build robust web services with idiomatic Rust code. It's an excellent choice for building REST APIs, web applications, or any network service where performance and reliability are paramount.

```toml
# Cargo.toml
[package]
name = "rocket_example"
version = "0.1.0"
edition = "2021"

[dependencies]
rocket = { version = "0.5.0-rc.2" } # Use the latest release candidate for 0.5

# To run this example:
# 1. Create a new Rust project: `cargo new rocket_example --bin`
# 2. Add the above dependencies to `rocket_example/Cargo.toml`
# 3. Replace the content of `rocket_example/src/main.rs` with the code below.
# 4. Run the application: `cargo run`
# 5. Open your browser to http://127.0.0.1:8000/ or http://127.0.0.1:8000/hello/Rustacean
```
```rust
// src/main.rs

use rocket::{get, launch, routes};

// A simple route for the root path ("/").
// It responds with a static string.
#[get("/")]
fn index() -> &'static str {
    "Hello, Rocket!"
}

// A route that captures a path parameter 'name'.
// The type of 'name' is inferred or can be specified.
// It returns a dynamically formatted string.
#[get("/hello/<name>")]
fn hello(name: &str) -> String {
    format!("Hello, {}!", name)
}

// The `#[launch]` macro creates the main function that launches the Rocket application.
// It builds the Rocket instance and mounts the defined routes.
#[launch]
fn rocket() -> _ {
    rocket::build()
        // Mount the routes defined above at the root path.
        .mount("/", routes![index, hello])
}
```