Where to add custom domain code
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Hi there,
I’m very new to WordPress but I am a developer trying to add caching to an existing WP REST API and I have come across your plugin hoping it can help. I have however, never used PHP in my life and never edited plugin code before so I’m just looking for a bit of basic assistance! I am using the ACF to REST API plugin and have various endpoints that I’d like to add browser caching to such as:
/wp-json/acf/v3/pages/1611
/wp-json/acf/v3/pages/59
/wp-content/uploads/2019/03/HomepageMobileMar19-3.jpg
/wp-json/acf/v3/get_blog_block_postsI have seen your FAQ on adding code for a custom endpoint but frankly I have no idea where to put this. Does it just go in wp-rest-cache.php?
Thanks in advance 🙂
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Excellent! Thank you Acato!
With your help I’ve managed to make some progress and have found functions.php in my theme. I copied you FAQ code from the link I previously provided and changes ‘posts’ the ‘pages’ for my use case.
/** * Register the /wp-json/acf/v3/pages endpoint so it will be cached. */ function wprc_add_acf_pages_endpoint( $allowed_endpoints ) { if ( ! isset( $allowed_endpoints[ 'acf/v3' ] ) || ! in_array( 'pages', $allowed_endpoints[ 'acf/v3' ] ) ) { $allowed_endpoints[ 'acf/v3' ][] = 'pages'; } return $allowed_endpoints; } add_filter( 'wp_rest_cache/allowed_endpoints', 'wprc_add_acf_pages_endpoint', 10, 1);I have added this at the top of functions.php and saved the file. I’m still getting max-age=1 when sending a GET request to a page URL such as /wp-json/acf/v3/pages/1611 though (I have set the Cache timeout setting in Settings > WP REST Cache to 1 hour). Any ideas where I’m going wrong?
Ahh I see!
OK, so I can see a few entries in the Endpoint API Caches list such as:
/wp-json/acf/v3/pages/38
/wp-json/acf/v3/pages/7
/wp-json/acf/v3/pages/285And the response in Postman does have the
X-WP-Cached-Callheader for these requests so it is working to an extent but the example I gave previously (/wp-json/acf/v3/pages/1611) is nowhere to be seen and theX-WP-Cached-Callheader is not present for that one. Is there some condition not being met that means some are cached but some aren’t?One further question regarding what you’ve said about not setting the max-age – will this mean that page speed tools like https://www.webpagetest.org/ and Google PageSpeed won’t recognise that the item is being cached? That’s the main reason I’m doing all of this so I’d hope for the caching to be picked up by those tools! Currently https://www.webpagetest.org/ is telling me:
FAILED – (1 seconds) – https://domain.com/wp-json/acf/v3/pages/1611
…which I’m guessing is based off the max-age?
Hi @afurnisstap
I have just added two filters which allow you to change the headers for the cached response:
Add the cache control header if it is not present:
/** * Add Cache-Control header if not present. */ function wprc_filter_headers( $headers, $request_uri ) { if(!array_key_exists('Cache-Control', $headers)) { $headers['Cache-Control'] = 'max-age=3600'; } return $headers; } add_filter('wp_rest_cache/cache_headers', 'wprc_filter_headers', 10, 2);Set the max-age to 3600:
/** * Set max-age to 3600. */ function wprc_filter_header($header_value, $header_name, $request_uri) { if($header_name == 'Cache-Control'){ return 'max-age=3600'; } return $header_value; } add_filter('wp_rest_cache/cache_header', 'wprc_filter_header', 10, 3);A new version of the plugin is now available. Please note: the headers are also cached, so you will have to clear the cache in order for the filters to work.
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