Final Project: Building a Multithreaded Web Server

It’s been a long journey, but we’ve reached the end of the book. In this chapter, we’ll build one more project together to demonstrate some of the concepts we covered in the final chapters, as well as recap some earlier lessons.

For our final project, we’ll make a web server that says “hello” and looks like Figure 20-1 in a web browser.

<span class="caption">Figure 20-1: Our final shared project</span>

Here is the plan to build the web server:

1. Learn a bit about TCP and HTTP.
2. Listen for TCP connections on a socket.
3. Parse a small number of HTTP requests.
4. Create a proper HTTP response.
5. Improve the throughput of our server with a thread pool.

But before we get started, we should mention one detail: the method we’ll use won’t be the best way to build a web server with Rust. A number of production-ready crates are available on https://crates.io/ that provide more complete web server and thread pool implementations than we’ll build.

However, our intention in this chapter is to help you learn, not to take the easy route. Because Rust is a systems programming language, we can choose the level of abstraction we want to work with and can go to a lower level than is possible or practical in other languages. We’ll write the basic HTTP server and thread pool manually so you can learn the general ideas and techniques behind the crates you might use in the future.