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Editorial Team
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Asked: 2026-05-18T01:35:10+00:00

I have the following Ruby code: require ‘net/http’ require ‘uri’ include Net $DEBUG =

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I have the following Ruby code:

require 'net/http'
require 'uri'

include Net

$DEBUG = 1

print "Enter a GitHub username: "
username = gets

puts "Username = #{username}" if $DEBUG == 1

source = HTTP.get(URI.parse("http://github.com/api/v2/xml/user/show/#{username}"))

puts source if $DEBUG == 1

Whenever I run it, I get the following error:

Exception `Errno::EAGAIN' at /usr/local/lib/ruby/1.9.1/net/protocol.rb:135 - Resource temporarily unavailable - read would block

Even though it works fine. Any ideas as to why this is happening and how to stop it happening?

Thanks in advance!

EDIT: Using htty, I was able to connect to the desired server and get the resource just fine without any errors.

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1 Answer

  1. Editorial Team

    My guess is that your use of the global $DEBUG variable is revealing a bug or undesired state in Net::Protocol. If you set $DEBUG = false it goes away.

    At that point in the Net::Protocol code it’s trying to do a non_blocking read, and appears to be timing out.

    Ruby uses the $DEBUG flag as part of the -d mechanism. If you put puts $DEBUG in a script and run it you’ll see that variable toggle. Because it’s a global it’ll be visible in any code needing debugging so you, or the code’s author, can trigger extra-special verboseness to help debug things:

    greg-mbp-wireless:Desktop greg$ ruby untitled.rb 
false
greg-mbp-wireless:Desktop greg$ ruby -d untitled.rb 
true
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