ruby net/http: How to fix EOFError on HTTPS POST request - ruby

Question

I'm writing a script to get data from GitHub v4 API. But my Ruby script fails on EOFError. How to avoid EOFError?
The following code fails on end of file reached (EOFError). I run the script 10 times, but no one suceeded.
require 'net/http'
require 'uri'
uri = URI.parse 'https://api.github.com/graphql'
header = {
'Authorization' => 'bearer MY_GITHUB_TOKEN',
}
Net::HTTP.new uri.host, uri.port do |http|
http.use_ssl = true
end.start do |http|
req = Net::HTTP::Post.new uri.path, header
req.body = " \
{ \
\"query\": \"query { viewer { login }}\" \
} \
"
http.request req do |res|
p res.code
p res.message
p res.body
p res.read_body
res.read_body do |body|
p body
end
end
end
I'm using Ruby ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]
compiled by rbenv-build. I got following stack trace.
Traceback (most recent call last):
11: from tmp.rb:20:in `<main>'
10: from /home/yuntan/.rbenv/versions/2.6.3/lib/ruby/2.6.0/net/http.rb:920:in `start'
9: from tmp.rb:31:in `block in <main>'
8: from /home/yuntan/.rbenv/versions/2.6.3/lib/ruby/2.6.0/net/http.rb:1479:in `request'
7: from /home/yuntan/.rbenv/versions/2.6.3/lib/ruby/2.6.0/net/http.rb:1506:in `transport_request'
6: from /home/yuntan/.rbenv/versions/2.6.3/lib/ruby/2.6.0/net/http.rb:1506:in `catch'
5: from /home/yuntan/.rbenv/versions/2.6.3/lib/ruby/2.6.0/net/http.rb:1509:in `block in transport_request'
4: from /home/yuntan/.rbenv/versions/2.6.3/lib/ruby/2.6.0/net/http/response.rb:29:in `read_new'
3: from /home/yuntan/.rbenv/versions/2.6.3/lib/ruby/2.6.0/net/http/response.rb:40:in `read_status_line'
2: from /home/yuntan/.rbenv/versions/2.6.3/lib/ruby/2.6.0/net/protocol.rb:201:in `readline'
1: from /home/yuntan/.rbenv/versions/2.6.3/lib/ruby/2.6.0/net/protocol.rb:191:in `readuntil'
/home/yuntan/.rbenv/versions/2.6.3/lib/ruby/2.6.0/net/protocol.rb:225:in `rbuf_fill': end of file reached (EOFError)

Answer 1

Due to my wrong guess.
Net::HTTP.new does not take any block, so the code below
Net::HTTP.new uri.host, uri.port do |http|
http.use_ssl = true
end.start ...
should be
(Net::HTTP.new uri.host, uri.port).tap do |http|
http.use_ssl = true
end.start ...