Topic: does not work in wp_head hook

exneuss
April 24, 2024 at 9:13 am
Hi,
I want to preload an image via <link rel="preload" ...>
Therefore, I created a wp_head hook and put my <link rel="preload" ...> in there.
Unfortunately all <link rel="preload" ...> statements are omitted and do not appear in the <head>-element of the webpage.
<link rel="prefetch" ...> statements are not omitted.

My wp_head hook looks like this:
```
<link rel="preload" fetchpriority="high" as="image" href="xyz" type="image/svg+xml">
<link rel="prefetch" fetchpriority="high" as="image" href="xyz" type="image/svg+xml">
<link rel="preload" fetchpriority="high" as="image" href="xyz" type="image/webp">
```
And only the <link rel="prefetch" fetchpriority="high" as="image" href="xyz" type="image/svg+xml"> appears in the <head>-element of the webpage.

I linked screenshots in the private information section.

Thanks for your help!
Ying
April 24, 2024 at 11:18 am

Hi there,

It’s not possible for the hook element only show part of the content.

1. What is the location you set for the hook element?

2. Do you have cache enabled? If so, can you clear all cache and disable all cache? Including server-level cache.

Let me know 🙂
exneuss
April 24, 2024 at 11:51 pm

Hi,
that is what I thought as well but it seems it is somehow.
1. complete site
2. I do not have any cache enabled yet.
The element responds to changes. If I remove the <link rel="prefetch" ...> statement it is not shown anymore and if I add another <link rel="prefetch" ...> statement I can see that. Only the <link rel="preload" ...> statements are not shown.
Alvind
April 25, 2024 at 1:01 am

Hi there,

Could you provide temporary login credentials for us to check the backend settings?
exneuss
April 25, 2024 at 1:25 am

Hi,
I can provide you with a login to the testing site I used which behaves the same.
David
April 25, 2024 at 5:19 am

Hi there,

i temporarily edited your Hook element, and for testing before each of the link tags i added a HTML Comment of: 
And on the front end i could see ALL 3 of the comments. But only the prefetch link.

I then run some checks on the HTML to make sure there were no bad characters that could result in them being saninitized out by WP and tested them on my own site. There were no issues with the code and all 3 links were output correctly on my test site.

Which means the Element Hook is working but something else is stripping out those preload links at a later point. But i cannot tell you what is doing that.

Permanently delete any old elements in the trash.
And quick edit all other elements except the Preoads and set them to DRAFT, this will eliminate any conflicts from other elements.
Disable all other plugins except GP Premium and again test for conflicts

if the issue persists then you need to look upstream and check with the host to make sure theres no mod security or other server functions that may be removing them.
exneuss
April 25, 2024 at 5:41 am

Hi,

thanks for your help.

I tried the things you suggested and it did not work.

I will contact the host and see what they say.
David
April 25, 2024 at 7:37 am

Let us know what you find.

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does not work in wp_head hook