§2023-02-27

• [Media Type](https://devblast.com/r/master-ruby-web-apis/media-type-fun

Our web API is currently returning a JSON document labeled with the media type for HTML. We need to fix this ASAP.

$ curl -i http://localhost:4567/users
HTTP/1.1 200 OK
Content-Type: text/html;charset=utf-8       <-- labled as HTML
Content-Length: 203
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-Frame-Options: SAMEORIGIN
Connection: keep-alive
Server: thin
....

• webapp.rb as,

# webapi.rb
require 'sinatra'
require 'json'

users = {
  'thibault': { first_name: 'Thibault', last_name: 'Denizet', age: 25 },
  'simon':    { first_name: 'Simon', last_name: 'Random', age: 26 },
  'john':     { first_name: 'John', last_name: 'Smith', age: 28 }
}

# WE ADDED THIS!
before do
  content_type 'application/json'
end

get '/' do
  'Master Ruby Web APIs - Chapter 2'
end

get '/users' do
  users.map { |name, data| data.merge(id: name) }.to_json
end

$ curl -i http://localhost:4567/users
HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 203
X-Content-Type-Options: nosniff
Connection: keep-alive
Server: thin
....

4.2. Offering JSON and XML

• Gyoku translates Ruby Hashes to XML

• gyoku gem into Gemfile and install

• webapp.rb as,

# webapi.rb
require 'sinatra'
require 'json'

# We require gyoku here in order to use it in the
# XML route.
require 'gyoku'

users = {
  thibault: { first_name: 'Thibault', last_name: 'Denizet', age: 25 },
  simon:    { first_name: 'Simon', last_name: 'Random', age: 26 },
  john:     { first_name: 'John', last_name: 'Smith', age: 28 }
}

before do
  content_type 'application/json'
end

get '/' do
  'Master Ruby Web APIs - Chapter 2'
end

# Looping through the list of routes for which
# we want to return a JSON representation.
['/users', '/users.json'].each do |path|
  get path do
    users.map { |name, data| data.merge(id: name) }.to_json
  end
end

# Defining /users.xml with the application/xml media type
# and simply calling Gyoku on our users hash with a root
# element 'users'.
get '/users.xml' do
  content_type 'application/xml'
  Gyoku.xml(users: users)
end

$ curl  http://localhost:4567/users
[{"first_name":"Thibault","last_name":"Denizet","age":25,"id":"thibault"},{"first_name":"Simon","last_name":"Random","age":26,"id":"simon"},{"first_name":"John","last_name":"Smith","age":28,"id":"john"}] 

$ curl  http://localhost:4567/users.json
[{"first_name":"Thibault","last_name":"Denizet","age":25,"id":"thibault"},{"first_name":"Simon","last_name":"Random","age":26,"id":"simon"},{"first_name":"John","last_name":"Smith","age":28,"id":"john"}]

$ curl  http://localhost:4567/users.xml
<users><thibault><firstName>Thibault</firstName><lastName>Denizet</lastName><age>25</age></thibault><simon><firstName>Simon</firstName><lastName>Random</lastName><age>26</age></simon><john><firstName>John</firstName><lastName>Smith</lastName><age>28</age></john></users>