红宝石捕获连接超时错误

Question

I am using Mechanize in Ruby to post forms to a site to obtain data. Occasionally, I will get the error

too many connection resets (due to Operation timed out - Errno::ETIMEDOUT) after 13 requests on 34234234234242, last used 20.518373 seconds ago

This will crash the server. I would like to catch this error and handle it(by retrying later on).

I tried

 begin 
    postForm(form)
  rescue Errno::ETIMEDOUT
    puts "=====>TimeOut ERROR!:"  
  end

But it is not catching the error. What am I missing?

Thanks.

Answer 1

It looks like Mechanize caught the Errno::ETIMEDOUT error and threw a new exception containing the error message. Therefore, the exception class name is different, and can't be caught with Errno::ETIMEDOUT .

To determine the type of error, try this:

begin 
  postForm(form)
rescue => e
  puts e.class  
end

That will give you the exception class name, and you can update the rescue clause.

Answer 2

If you read the entire error message, you see that you failed because of a 'too many connection resets' : The timeout is only what caused the connection to reset 13 times, and has already been rescued.

So if you read the source of Net-Http-persistent >here< , you will see that the error you need to catch is :

Net::HTTP::Persistent::Error