How to download a delayed file via HTTP in Ruby? -

i use following ruby function download various files via http:

def http_download(uri, filename)   bytes_total = nil   begin     uri.open(       read_timeout: 500,       content_length_proc: lambda { |content_length|         bytes_total = content_length       },       progress_proc: lambda { |bytes_transferred|         if bytes_total           print("\r#{bytes_transferred} of #{bytes_total} bytes")         else           print("\r#{bytes_transferred} bytes (total size unknown)")         end       }     ) |file|       open filename, 'w' |io|         file.each_line |line|           io.write line         end       end     end   rescue => e     puts e   end end 

i want download files (csv, kml, zip, geojson) this website. however, there some kind of delay set up. when click download link in browser takes bit until download window appears. suppose file needs processed on server before can served.

how can modify script take delay account?

i running ruby 2.2.2.

here modification according post , comment:

require 'open-uri'  def http_download(uri, filename)   bytes_total = nil   index = 1   begin     open(       uri,       read_timeout: 500,       content_length_proc: lambda { |content_length|         bytes_total = content_length       },       progress_proc: lambda { |bytes_transferred|         if bytes_total           print("\r#{bytes_transferred} of #{bytes_total} bytes")         else           print("\r#{bytes_transferred} bytes (total size unknown)")         end       }     ) |io|       # if "application/json" == io.content_type       if io.is_a? stringio         raise " --> failed, server processing. retry request ##{index}"       else # tempfile         puts "\n--> succeed, writing #{filename}"         file.open(filename, 'w'){|wf| wf.write io.read}       end     end   rescue => e     puts e     return if e.is_a? openuri::httperror # processing error      index += 1     return if index > 10      sleep index , retry   end end