Set the body of the request. The supplied body value can be a string or
a map of parameters to be url-encoded.

Set the content length of the request map.

Set the content type of the request map.

Add a cookie to the request headers map

A map of the default ports for a scheme.

Add a HTTP header to the request map.

Set the body of the request to a JSON structure. The supplied body value
should be a map of parameters to be converted to JSON.

Set the body of the request to a map of parameters encoded as a multipart
form. The parameters are supplied as a map. The keys should be keywords or
strings. The values should be maps that contain the following keys:

  :value        - a string, byte array, File or InputStream
  :filename     - the name of the file the value came from (optional)
  :content-type - the content type of the value (optional)

The value may also be a string, byte array, File or InputStream instead of a
map. In that case, it will be treated as if it were a map with a single :value
key.

Set the query string of the request to a string or a map of parameters.

Create a minimal valid request map from a HTTP method keyword, a string
containing a URI, and an optional map of parameters that will be added to
the query string of the URI. The URI can be relative or absolute. Relative
URIs are assumed to go to http://localhost.