I have an nginx server with SSL enabled. As it operates on a different port (than 443), sometimes it receives plain HTTP requests instead of HTTPS. I'd like to set up a redirection for that to replace the scheme automatically, I tried this code:

error_page 497 https://$host:$server_port$request_uri;

But the problem here that as the server operates in a VM and the port is forwarded to a different port, it redirects to an invalid port (from which the server got the request).

My question is: how can I parse/get the port from the request rather than the port from the server received the request?


Hopefully not too little too (eight months!) late. I had a similar question myself, to use the original request port in nginx.conf.

nginx $http_name variable

$http_name: arbitrary request header field; the last part of a variable name is the field name converted to lower case with dashes replaced by underscores

$http_host should therefore contain the request 'Host' header, if that helps.

e.g. localhost:8020

  • 1
    It worked, thank you! Here is the final solution: error_page 497 https://$http_host$request_uri; – riska May 10 '18 at 11:24

This question is pretty much a duplicate of this one:

How to forward non-http requests on port 80 to another port?

There they receive non-HTTP requests on port 80, you get non-HTTPS requests on a port 443 alternative. Other than that, the idea is the same.

Nginx modules exists to do more with TCP packets:



  • Not really, it's not just a simple redirect, let me explain: I request the url https://localhost:8443/ from my browser and this request get forwarded to my VM's port 443 where it get handled. But if I use HTTP, then the url is http://localhost:8443/ and it hits the server on the port 443. So if I use the $server_port, then I get redirected to https://localhost:443. Additionally, as it's a VM, I can't be sure that it's always port 8443 so I can't hardcode it but I have to parse it from the request somehow. – riska Jul 12 '17 at 13:18

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