A simple graphql client without define schema.

graphql_client.rb

require "net/http"
require "json"

# client = Graphql::Client.new("http://localhost:3000/graphql", { "Authorization" => "Bearer token..." })
# response = client.execute("query { ... }", { name: "value" })
class Graphql::Client
  def initialize(endpoint, headers = {})
    @endpoint = endpoint
    @headers = headers
  end

  def execute(query, variables = {})
    data = {
      query: query,
      variables: variables
    }.to_json

    headers = {
      "Content-Type" => "application/json"
    }.merge(@headers)

    uri = URI(@endpoint)

    response = Net::HTTP.post(uri, data, headers)

    JSON.parse(response.body)["data"]
  end
end