Support » Plugin: WP REST Cache » Caching a perticular end point

  • I am totally new to Rest API caching and I want to make sure that I set things up correctly. My issue is that my PWA App manifest file uses the Rest API and loads exceptionally slowly. It is a common issue for PWA manifest files. It’s end point is https://www.ocalahomes.online/wp-json/app/v1/pwp-manifest. How do I make sure that your plugin caches this end point while allowing it to continue caching all other Rest API activity. Right now I don’t see any caches being created and Sight Health shows that the Rest API is activated and working properly.

    The page I need help with: [log in to see the link]

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  • Thread Starter aakrealtor

    (@aakrealtor)

    As a follow up, I installed the following code in my wp-rest.php file to identify the end point I want cached. It it is derived from the URL of the end point above:

    /**
    * Register the /wp-json/app/v1/pwp-manifest endpoint so it will be cached.
    */function wprc_add_app_manifest_endpoint( $allowed_endpoints ) {
    if ( ! isset( $allowed_endpoints[ ‘app/v1’ ] ) ||
    ! in_array( ‘posts’, $allowed_endpoints[ ‘app/v1’ ] ) ) {
    $allowed_endpoints[ ‘app/v1’ ][] = ‘manifest’;
    }
    return $allowed_endpoints;
    }add_filter( ‘wp_rest_cache/allowed_endpoints’, ‘wprc_add_app_manifest_endpoint’, 10, 1);

    As a result I see the following in the cache of the WP REST Cache plugin:

    Cache Key:
    aad60a08557f4c0d3871114b201d7f19

    Request URI:
    /wp-json/wp/v2/posts/11118?_fields=title

    Request Headers
    {“\/wp-json\/app\/v1\/pwp-manifest”:null}

    Request Method:
    GET

    Object Type:
    unknown

    Expiration:
    2021-10-30 08:48:16

    # Cache Hits
    4

    Active
    check mark

    Is this the expected output? The reasons I am asking are as follows:
    (1) The word “null” appears in the line under request headers.
    (2) The object type is reported as “unknown”.
    (3) I tested in GTmetrix and the https://www.ocalahomes.online/wp-json/app/v1/pwp-manifest end point URL is not being reported as loading any quicker.

    Thanks in advance for any clarifications anyone can offer.

    Plugin Author Richard Korthuis

    (@rockfire)

    Hi @aakrealtor

    The results you are seeing in the cache suggest to me that you have applied some other filter ( wp_rest_cache/cacheable_request_headers ). Since if you would have applied the filter wp_rest_cache/allowed_endpoints the Request Headers wouldn’t contain your pwp-manifest endpoint.

    Now looking at your code for the wp_rest_cache/allowed_endpoint filter, I think you made an error there. In the comment you say you register the /wp-json/app/v1/pwp-manifest endpoint, but in the actual code you left out the pwp- part. So I guess you registered the wrong (non-exisiting?) endpoint /wp-json/app/v1/manifest

    The correct code should be:

    /**
     * Register the /wp-json/app/v1/pwp-manifest endpoint so it will be cached.
     */
    function wprc_add_app_manifest_endpoint( $allowed_endpoints ) {
    	if ( ! isset( $allowed_endpoints[ 'app/v1' ] ) || ! in_array( 'posts', $allowed_endpoints[ 'app/v1' ] ) ) {
    		$allowed_endpoints[ 'app/v1' ][] = 'pwp-manifest';
    	}
    
    	return $allowed_endpoints;
    }
    
    add_filter( 'wp_rest_cache/allowed_endpoints', 'wprc_add_app_manifest_endpoint', 10, 1 );
Viewing 2 replies - 1 through 2 (of 2 total)
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