Setting up an HTTP-to-HTTPS redirect

This example demonstrates how to use URL redirects to redirect all requests from port 80 (HTTP) to port 443 (HTTPS).

HTTPS uses TLS (SSL) to encrypt HTTP requests and responses, making it safer and more secure. A website that uses HTTPS has https:// in the beginning of its URL instead of http://.

  • The same frontend IP address used by LB1
  • A redirect configured in the URL map

This partial HTTP load balancer uses the same IP address as your HTTPS load balancer and redirects HTTP requests to your load balancer's HTTPS frontend.

This architecture is shown in the following diagram.

HTTP-to-HTTPS redirect configuration (click to enlarge)
HTTP-to-HTTPS redirect configuration

Redirecting traffic to your HTTPS load balancer

After you have verified that your external HTTPS load balancer (LB1) is working, you can create the partial external HTTP load balancer (LB2) with its frontend configured to redirect traffic to LB1.

This example uses the 301 response code. You can instead use a different response code.

To configure the redirect with gcloud, you must import a YAML file and make sure that your target HTTP proxy points to the URL map that redirects traffic. If you're using the Cloud Console, this is handled for you.

gcloud

  1. Create a YAML file /tmp/web-map-http.yaml. This example uses MOVED_PERMANENTLY_DEFAULT as the response code.
  2.        kind: compute#urlMap
           name: web-map-http
           defaultUrlRedirect:
             redirectResponseCode: MOVED_PERMANENTLY_DEFAULT
             httpsRedirect: True
           tests:
           - description: Test with no query parameters
             host: example.com
             path: /test/
             expectedOutputUrl: https://example.com/test/
             expectedRedirectResponseCode: 301
           - description: Test with query parameters
             host: example.com
             path: /test/?parameter1=value1&parameter2=value2
             expectedOutputUrl: https://example.com/test/?parameter1=value1&parameter2=value2
             expectedRedirectResponseCode: 301
           
  3. Validate the URL map.
  4. If the tests pass and the command outputs a success message, save the changes to the URL map.

  5. Create the HTTP load balancer's URL map by importing the YAML file. The name for this URL map is web-map-http.
  6. If you are updating an existing URL map, the following prompt appears:

           Url Map [web-map-http] will be overwritten.
    
           Do you want to continue (Y/n)?
           

    To continue, press Y.

  7. Verify that the URL map is updated. Your HTTP load balancer's URL map should look something like this:
  8. Create a new target HTTP proxy or update an existing target HTTP proxy, using web-map-http as the URL map.
  9. Create a forwarding rule to route incoming requests to the proxy. The --address flag specifies lb-ipv4-1, which is the same IP address used for the external HTTPS load balancer.

Testing the HTTP-to-HTTPS redirect

Note the reserved IP address that you are using for both load balancers.

In this example, assume that the reserved IP address is 34.98.77.106. The http://34.98.77.106/ URL redirects to https://34.98.77.106/.

After a few minutes have passed, you can test this by running the following curl command.

curl -v http://hostname.com

Sample output:

* Connected to 34.98.77.106 (34.98.77.106) port 80 (#0)
> GET / HTTP/1.1
> Host: hostname.com
> User-Agent: curl/7.64.0
> Accept: */*
>
< HTTP/1.1 301 Moved Permanently
< Cache-Control: private
< Content-Type: text/html; charset=UTF-8
< Referrer-Policy: no-referrer
< Location: https://hostname.com
< Content-Length: 220
< Date: Fri, 30 Jul 2021 21:32:25 GMT
<
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>301 Moved</TITLE></HEAD><BODY>
<H1>301 Moved</H1>
The document has moved
<A HREF="https://hostname.com">here</A>.
</BODY></HTML>
* Connection #0 to host hostname.com left intact