Create HTTP policy

Last update: September 06 2024

Create HTTP policy

The number of HTTP policies in a rule and the number of conditions in an HTTP policy are unlimited.

Control panel

1. В control panels go to Cloud platform → Balancers.

2. Open the tab Balancers → balancer page.

3. Open the rule card.

4. Click Add a new policy.

5. Select the parameter for which the query will be checked: HOSTNAME for the domain name or PATH to check the path.

6. Select the type of match to the reference value:

   • EQUAL TO — is a match;
   • STARTS WITH — begins with;
   • ENDS WITH — ends in;
   • CONTAINS — contains;
   • REGEX — regular expression.

7. Enter a control value to check. If you selected the condition in step 6 REGEX, enter a regular expression.

8. Optional: to add another condition to the policy, press New condition and customize it. If there are multiple conditions in the policy, the request must match each condition to fall under the policy.

9. Specify where to redirect the matching request:

   • Direct to the target group — select a target group or create a new with the HTTP protocol;
   • Redirect to URL — enter a target URL that will completely replace the request URL, including protocol, domain name, path, and request parameters;
   • Redirect to URL prefix — enter the part of the URL to replace the protocol and domain name in the request URL. For example, if you enter https://example.com/newthen the request for https://example.com/api will be forwarded to https://example.com/new/api

   To not accept requests that match the policy, select Reject traffic.

10. Enter a policy name or leave the default one generated.

11. Click Add.

OpenStack CLI

1. Open the OpenStack CLI.

2. Create HTTP policy in the rule:

   openstack loadbalancer l7policy create \
     --action <action> \
     [--redirect-url <url> | --redirect-prefix <prefix_url> | --redirect-pool <pool> ]
     --position <position> \
     --name <policy_name> \
     <listener>

   Specify:

   • <action> — action to balance traffic:

     • REDIRECT_TO_URL — completely replace the request URL, including protocol, domain name, path, and parameters;
     • REDIRECT_PREFIX — replace the protocol and domain name in the request URL;
     • REDIRECT_TO_POOL — to target the target group,
     • REJECT — dismiss;

   • <policy_name> — L7-policy name;

   • where the traffic needs to be directed:

     • --redirect-url <url> — the full URL for the redirect. Specify if the action is selected REDIRECT_TO_URL;
     • --redirect-prefix <prefix_url> — URL prefix to replace the protocol and domain in the request, e.g. https://example.com. Indicate if the action is selected REDIRECT_PREFIX;
     • --redirect-pool <pool> — ID or name of the target group. Specify if the action is selected REDIRECT_TO_POOL. The list can be viewed with openstack loadbalancer pool list. If you don't already have a target group, create it.

   • --position <position> — the position of the policy in the rule. Indicate if there will be more than one policy with the same action in the rule, the policy with position 1 will be the first to apply;

   • <listener> — The ID or name of the rule. The list can be viewed with openstack loadbalancer listener list

3. Create a condition in the HTTP policy:

   openstack loadbalancer l7rule create \
     --compare-type <compare_type> \
     --type <type> \
     --value <value> \
     <policy>

   Specify:

   • <compare_type> — type of match with the control value:

     • EQUAL TO — is a match;
     • STARTS WITH — begins with;
     • ENDS WITH — ends in;
     • CONTAINS — contains;
     • REGEX — regular expression;

   • <type> — parameter in the query to check: HOST_NAME, PATH, COOKIE, FILE_TYPE, HEADER;

   • <value> — control value;

   • <policy> — The ID or name of the L7 policy that you created in step 2.