Building an HTTP frame on top of TCP
Before we explored the Tokio framework in this book, we used HTTP to send and receive data to and from servers. The HTTP protocol is essentially built on top of TCP. In this section, while we will create an HTTP frame, we will not mimic the HTTP protocol completely. Instead, to prevent excessive code, we will create a basic HTTP frame to understand the mechanisms utilized when creating an HTTP frame. It also must be stressed that this is for educational purposes. TCP is good for our protocols, but if you want to use HTTP handlers, it is quicker, safer, and less error-prone to use out-of-the-box HTTP handlers such as Hyper. We will cover how to use Hyper HTTP handlers with Tokio in the next chapter.
When it comes to an HTTP request, a request generally has a header and a body. When we send over a request, the header will tell us what method is being used and the URL associated with the request. To define our HTTP frame, we need the same structs...