cURL输出中“local_ip”和“primary_ip”的含义是什么？

Question

I am trying to connect to a site with curl but it returns error 503.

I thought maybe the site blocked my IP. I bought another IP for my VPS and connected with this IP to that site but still I can not connect and have the same error.

I view the cURL output and see two my requests have the same primary IP but different local IP.

The primary IP is not in my purchased IP list. What does primary IP represent in the cURL output?

Array ( 
  [url] => http://adsl.tci.ir/ 
  [content_type] => text/html; charset=UTF-8 
  [http_code] => 302 
  [header_size] => 366 
  [request_size] => 50 
  [filetime] => -1 
  [ssl_verify_result] => 0 
  [redirect_count] => 0 
  [total_time] => 0.01543 
  [namelookup_time] => 0.004182 
  [connect_time] => 0.0057 
  [pretransfer_time] => 0.005737 
  [size_upload] => 0 
  [size_download] => 13458 
  [speed_download] => 872197 
  [speed_upload] => 0 
  [download_content_length] => -1 
  [upload_content_length] => 0 
  [starttransfer_time] => 0.015135 
  [redirect_time] => 0 
  [redirect_url] => http://adsl.tci.ir/panel 
  [primary_ip] => 217.218.86.7 
  [certinfo] => Array ( ) 
  [primary_port] => 80 
  [local_ip] => 185.208.174.63 
  [local_port] => 57646 
)

Answer 1

The local IP is the IP local to you. i.e. it is your IP address.

The primary IP is the IP you are making the request to. i.e. it is the IP that adsl.tci.ir resolves to.

[ ~ ] ➜  host adsl.tci.ir
adsl.tci.ir has address 217.218.86.7