REST API create page return 500 No content to map to Object Edited

[Николай Войнов]

Hi,

I want to export a tree of text nodes and build a page tree in the Confluence. I just started today to get to know REST API and got the first trouble. I'm using Ruby 3 and Excon for HTTP requests:

require 'json'
require 'excon'

site = "https://xyz.atlassian.net"
user = "me"
pass = "my_secret"

connection = Excon.new(site, user: user, password: pass)

# reqest for all pages works perfectly
response = connection.get(path: "/wiki/rest/api/space/DEMO/content/page")
JSON.parse(response.body)["results"].each do |page|
  puts "id: #{page["id"]}; title: #{page["title"]}"
end

# but here I got 500
# statusCode\":500,\"message\":\"java.io.EOFException No content to map to Object due to end of in
response = connection.post(
path: "/wiki/rest/api/content",
headers: {
"Accept" => "application/json",
"Content-Type" => "application/json" },
data: JSON.generate(
"type" => "page",
"title" => "Ruby page",
"space" => {"key" => "DEMO"},
"status" => "current",
"body" => {
"storage" => {
"value" => "This is Ruby page",
"representation" => "view"
}
}
})
)

What is wrong with my parameters?