net.rb

require 'net/http'

# Handling Network Connection Failure

begin
  http = Net::HTTP.new('localhost', '3000')
  http.open_timeout = 3
  http.read_timeout = 3
  http.get('/')    
rescue Errno::ECONNREFUSED => e
  puts 'The server is down.'
  puts e.message
  # Retry a few times and fail with connection refused error message
rescue Timeout::Error => e
  puts 'Timeout error occurred.'
  puts e.message
  # Retry a few times and fail with timeout error message
end

Handing the network is down issue.

require 'net/http'

# Handling Network Connection Failure

begin
  http = Net::HTTP.new('www.google.com', '80')
  http.open_timeout = 3
  http.read_timeout = 3
  http.get('/')    
  puts 'Success'
rescue SocketError
  puts 'Network connectivity issue'
  # SocketError: Failed to open TCP connection to www.google.com:80 (getaddrinfo: nodename nor servname provided, or not known)
  # Network is not 100% reliable
rescue Errno::ECONNREFUSED => e
  puts 'The server is down.'
  puts e.message
  # Retry a few times and fail with connection refused error message
rescue Timeout::Error => e
  puts 'Timeout error occurred.'
  puts e.message
  # Retry a few times and fail with timeout error message
end