Using the HTTP response

Armed with a good understanding of Julia's dictionary data structure, we can now take a closer look at the headers property of resp, our HTTP response object.

To make it easier to access the various headers, first let's convert the array of Pair to a Dict:

julia> headers = Dict(resp.headers) 
Dict{SubString{String},SubString{String}} with 23 entries: 
"Connection"     => "keep-alive" 
  "Via"          => "1.1 varnish (Varnish/5.1), 1.1 varnish (Varni... 
  "X-Analytics"  => "ns=0;page_id=38455554;https=1;nocookies=1" 
#... output truncated... #

We can check the Content-Length value to determine whether or not we have a response body. If it's larger than 0, that means we got back a HTML message:

julia> headers["Content-Length"] 
"193324"

It's important to remember that all the values in the headers dictionary are strings, so we can't go comparing them straight away:

julia> headers["Content-Length"] > 0 
ERROR: MethodError: no method matching isless(...