Reading forms, query arguments, files, JSON, and more

Now that we know about pulling input from the path and the headers, we will turn our attention to more classic types of passing input values. Typically, we think of request data as being those bits of information that come from the request body. However, before we turn to the request body, we still have one more item in the first line of the HTTP request to examine: Query arguments.

Query arguments

As a reminder, the first line of an HTTP request looks like this:

GET /stalls/2021-07-01?type=fruit HTTP/1.1

If you have previous web experience, you might know that a URL can have a section of arbitrary parameters separated from the rest of the path by a question mark (?). These are known as query arguments (or parameters), follow in the form of key=value, and are concatenated with an ampersand (&). Sometimes, they are called parameters, and sometimes, they are called arguments. Here, we will call them arguments since...