Connection errors with basic auth credentials in URL string

test.go

package main

import (
	"log"
	"net/http"
)

func main() {
	_, err := http.Get("http://user:pass@localhost:12345")
	log.Fatal(err)
}

// 2018/03/27 20:07:28 Get http://user:pass@localhost:12345: dial tcp [::1]:12345: getsockopt: connection refused
// exit status 1

test.py

import urllib2
contents = urllib2.urlopen("http://user:pass@localhost:12345").read()

# Traceback (most recent call last):
#   File "test.py", line 2, in <module>
#     contents = urllib2.urlopen("http://user:pass@localhost:12345").read()
#   File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 154, in urlopen
#     return opener.open(url, data, timeout)
#   File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 431, in open
#     response = self._open(req, data)
#   File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 449, in _open
#     '_open', req)
#   File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 409, in _call_chain
#     result = func(*args)
#   File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1227, in http_open
#     return self.do_open(httplib.HTTPConnection, req)
#   File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 1197, in do_open
#     raise URLError(err)
# urllib2.URLError: <urlopen error [Errno 8] nodename nor servname provided, or not known>

test.rb

require "net/http"
require "uri"

uri = URI.parse("http://user:pass@localhost:12345/")

# Full
http = Net::HTTP.new(uri.host, uri.port)
response = http.request(Net::HTTP::Get.new(uri.request_uri))

puts response

# /Users/ejholmes/.rbenv/versions/2.3.3/lib/ruby/2.3.0/net/http.rb:882:in `rescue in block in connect': Failed to open TCP connection to localhost:12345 (Connection refused - connect(2) for "localhost" port 12345) (Errno::ECONNREFUSED)
#         from /Users/ejholmes/.rbenv/versions/2.3.3/lib/ruby/2.3.0/net/http.rb:879:in `block in connect'
#         from /Users/ejholmes/.rbenv/versions/2.3.3/lib/ruby/2.3.0/timeout.rb:91:in `block in timeout'
#         from /Users/ejholmes/.rbenv/versions/2.3.3/lib/ruby/2.3.0/timeout.rb:101:in `timeout'
#         from /Users/ejholmes/.rbenv/versions/2.3.3/lib/ruby/2.3.0/net/http.rb:878:in `connect'
#         from /Users/ejholmes/.rbenv/versions/2.3.3/lib/ruby/2.3.0/net/http.rb:863:in `do_start'
#         from /Users/ejholmes/.rbenv/versions/2.3.3/lib/ruby/2.3.0/net/http.rb:852:in `start'
#         from /Users/ejholmes/.rbenv/versions/2.3.3/lib/ruby/2.3.0/net/http.rb:1398:in `request'
#         from test.rb:8:in `<main>'