How to Handle Exceptions with Ruby Rest-Client

ruby rest_client exception handling

The callback block is executed only when receiving some response from the server. In this case, the name resolving is failed so RestClient.get just throws an exception without entering the block. Thus just wrap your code within a begin...end construct.

begin
  RestClient.get('http://thisurldoesnotexist/resource') { |response, request, result, &block|
  case response.code
    when 200
      p "It worked !"
      response
    else
      response.return!(request, result, &block)
    end
  }
rescue SocketError => e
  # Handle your error here
end

Ruby on rails rest client, handling error response

RestClient::Request will raise an exception when it receives error response (response code other than 2xx/3xx):

for result codes between 200 and 207, a RestClient::Response will be returned

for result codes 301, 302 or 307, the redirection will be followed if the request is a GET or a HEAD

for result code 303, the redirection will be followed and the request transformed into a GET

for other cases, a RestClient::Exception holding the Response will be raised; a specific exception class will be thrown for known error codes

call .response on the exception to get the server's response

Documentation

You should handle that exception:

def get url
  result = RestClient::Request.execute(method: :get, url: url)
  JSON.parse(result)
rescue RestClient::Exception
  "error" # no need to call 'as_json'
end

How could I handle rest-client 500 error response and keep scraping through my loop?

You should just rescue the exception for exmaple:

[*1..3].each{|i| RestClient.get('https://fooboton.free.beeceptor.com') rescue RestClient::InternalServerError; next}

So for your case do:

CSV.open('data2.csv', 'ab') do |csv|
    csv << ['Name', 'Street', 'Info', 'E-mail', 'Site']
    (1..30).each do |id|
      begin
        response = RestClient.get(link+id.to_s) 
      rescue RestClient::InternalServerError
        next # skip this iteration in your loop
      end
    ... # rest of your code

Need to rescue 401 status code using RestClient

I can't tell you and why I'm sure the rest-client repo can tell you :) ... but using RestClient::Request.new then executing the api call with a block works for me.
I think it probably has to do with the fact that the RestClient has built in exceptions.

request = RestClient::Request.new(
    method: :get,
    url: 'https://my-rest-service.com/resource.json')
response = request.execute {|response| response}
case response.code
  when 200
    puts "Good"
  when 401 
    puts "Bad"
    raise Exception
end

Restclient throwing unusual exception

So I found an answer to this, it had to do with Holger Just's answer with a minor tweak, I'm pretty sure my case is pretty unique because my company likes to hide behind a VPN script. So here's how I did it:

First I needed to install the pre-release gem of ffi using the platform flag: gem install ffi --pre --platform=ruby
Next I had to update the gem: gem update --all (I think that's the correct syntax for the flag)

That got ffi working.