Understanding HTTP responses

The result of the HTTP.get invocation is an object that closely mirrors a raw HTTP response. The package makes our lives easier by extracting the raw HTTP data and neatly setting it up in a data structure, which makes manipulating it a breeze.

Let's take a look at its properties (or fields in Julia's lingo):

julia> fieldnames(typeof(resp)) 
(:version, :status, :headers, :body, :request)

The fieldnames function accepts a type as its argument and returns a tuple containing the names of the fields (or properties) of the argument. In order to get the type of a value, we can use the typeof function, like in the previous example.

Right! The status, headers, and body fields should by now sound familiar. The version field represents the version of the HTTP protocol (the HTTP/1.1 part in the first line of the response). Most web servers on the internet today use version 1.1 of the protocol, but a new major version, 2.0, is almost ready for wide deployment. Finally, the...