CODEWITHSUNDEEP
rubycurl
user137369
user137369

Reputation: 5705

Check if webpage is online, with Ruby

With curl, I do the following to check if a webpage is online:

if curl --output /dev/null --silent --head --fail "${url}"; then
  echo "URL exists: ${url}"
else
  echo "URL does not exist: ${url}"
fi

However, if the server refuses HEAD requests (or I don’t know), an alternative is to request only the first byte of the file:

if curl --output /dev/null --silent --fail --range 0-0 "${url}"; then
  echo "URL exists: ${url}"
else
  echo "URL does not exist: ${url}"
fi

The first case is easy to replicate in Ruby:

require 'net/http'
require 'uri'

uri = URI.parse(url)
response = Net::HTTP.get_response(uri)

if response.kind_of? Net::HTTPOK
  puts "URL exists: #{url}"
else
  puts "URL does not exist: #{url}"
end

How do I replicate the second curl case?

Upvotes: 1

Views: 175

Answers (1)

Casper
Casper

Reputation: 34328

The range option essentially only sets the Range header. So to replicate you would do the same:

url = URI.parse(...)

req = Net::HTTP::Get.new(url.request_uri)
req['Range'] = 'bytes=0-0'

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = (url.scheme == "https")

response = http.request(req)

Upvotes: 2

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