How do I disable cache for Azure App Service?

Chris Saunders 0

We're running an App Service with Wordpress pre-installed but we're having a cache problem. Any changes made either via the CMS or by uploading new files, are not taking effect until the app service is stopped and restarted. We've tried setting these environment variables but it hasn't made any difference.

WEBSITE_DYNAMIC_CACHE = 0

WEBSITE_LOCAL_CACHE_OPTION = Disabled

WEBSITES_ENABLE_APP_CACHE = false

Has anyone had a similar problem or have any suggestions?

Thanks

Azar 22,860 Reputation points MVP

2024-04-03T11:27:03.73+00:00

Hi there Chris Saunders

That is a good question and thanks for using QandA platform

Lemme suggest a few options,

You can disable Local Cache on a per-web-app basis by using this app setting: WEBSITE_LOCAL_CACHE_OPTION = Never or

Sign in to the Azure portal and navigate to your App Service.

Click on "Configuration" from the left-hand menu.

Scroll down to the "General settings" section and toggle the "Web Sockets" option to "Off".

Scroll down to the "Application settings" section and click on "Add new setting".

Set the "Key" to "SCM_USE_MAIN_HUB_ENDPOINT" and the "Value" to "1".

Click on "Save" to apply the changes.

Have a look at this doc for more info

https://learn.microsoft.com/en-us/azure/app-service/overview-local-cache?source=recommendations

If this helps kindly accept the answer thanks much.
SnehaAgrawal-MSFT 21,506 Reputation points

2024-04-04T10:48:04.0933333+00:00

@Chris Saunders Thanks for reaching here! If I am understanding right you are using Azure App Service WordPress offering within the Azure Marketplace.

To elaborate-

Caching in WordPress is a technique used to improve the performance and speed of your WordPress website. By caching certain parts of your website or entire pages, you can reduce the load on your server and decrease page load times for your visitors. Caching can significantly improve the performance of your WordPress site, particularly when your site experiences high traffic loads.

If your WordPress site operates with multiple instances on the backend and your user base is distributed across the regions, then incorporating Azure Redis Cache for distributed caching can enhance your sites performance.

Azure Redis Cache is a fully managed, in-memory data store service offered by Microsoft Azure. It is based on the popular open-source Redis database and is used to build high-performance, scalable applications by providing a fast and low-latency data cache.

Follow Steps to Configure Azure Redis Cache with WordPress:

Also recommended you to refer this detailed on How to improve performance of WP Admin - WordPress on Azure App Service it would be helpful.

Please let us know.
Azar 22,860 Reputation points MVP

2024-04-05T13:02:47.75+00:00

Hi there

Checking if this helped, kindly accept the answer if it did thanks much.
Chris Saunders 0 Reputation points

2024-04-08T08:54:08.4933333+00:00

Hi

no none of the suggestions worked, websockets isn't an option. WORDPRESS_LOCAL_STORAGE_CACHE_ENABLED is currently set to true. Setting it to false gives a 500 error
Chris Saunders 0 Reputation points

2024-04-08T08:55:46.75+00:00

Hi

no none of them worked, websockets isn't even an option. WORDPRESS_LOCAL_STORAGE_CACHE_ENABLED is set to true and removing or setting it to false generates a 500 error so i've re-instated it.

SnehaAgrawal-MSFT 21,506

@Chris Saunders Thanks for reply! add below code in your wp-config.php file.

//Add This Code In wp-config.php File To Enable Cache With Expiration
define('WP_CACHE', true);      // enable the cache
define('ENABLE_CACHE', true);  // enable the cache
define('CACHE_EXPIRATION_TIME', 3600);  // in seconds

//Add This Code In wp-config.php File To Disable Cache
define('WP_CACHE', false);     // disable the cache
define('DISABLE_CACHE', true);  // disable the cache

Also suggest you to refer this detailed document on WordPress Best Practices for Performance

https://azureossd.github.io/2020/08/07/wordpress-best-practices-for-performance/

Let us know.

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How do I disable cache for Azure App Service?

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