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Webp support

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Should webp extra image get deleted if you replace the original image? That is: upload an image, thumb is generated, then create webp extra by using $myimge->webpurl, then in the admin you replace the image by uploading with the same name eg. replace img1.jpg with img1.jpg. Original image is replaced, thumb is recreated, but webp stay the same. This is how it should be?

webp.gif

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Please file a github issue (with the pw version)

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I first time used $config->pagefileSecure = true; option in config.php. When I echo the image webp extra like this in the template:

echo "<a href='{$img->webpUrl}'>Click to view image</a> ";

and then click on the link, the image can be viewed in the browser, as expected. But when I set pagefileSecure to true, reload the page and click on the link, the image is downloaded. I can see the warning in Chrome console:

Resource interpreted as Document but transferred with MIME type application/octet-stream: "http://localhost/site/assets/files/1015/nature1.webp". 

Also, headers changed to:

Content-disposition: attachment; filename="nature1.webp"
Content-transfer-encoding: binary
Content-Type: application/octet-stream
 
Is this expected or maybe something wrong with my webserver config (IIS)? I didn't change access permissions on the template and also viewing the image logged as admin user.

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Hello to all mighty people and Happy New decade start. Wish you all the greatest goodness, joy and happiness. Well, and a lot of great code as well 😉

I've implemented WEBP images to optimize my soon to be released profile and by a lucky coincidence I discovered on my Mac that no images are showing when using the Safari. I thought that Apple would have embraced the idea by now when several other browsers have already done that but it seemed like I was wrong.

I tested the .htaccess approach, however I could not make it working under Safari, so I decided to add a little function to my _functions.php:

//WEBP Image Support
function webp_support($imgURL)
{
    // Check if the browser headers contain image/webp support
    if(strpos($_SERVER['HTTP_ACCEPT'], 'image/webp')) { 

        // If yes, use the webp image url
        return $imgURL->webp;
    
    } else {

        //Else, show the original image url
        return $imgURL;

    }
}

After that, in every image call I do the following:

<?php
$img = $page->images->first // Call for the image location
$image = webp_support($img->size(100,100)) // Used to size an image and convert it to WEBP

//Image call in the markup
echo "<img src='{$image->url}' alt='{$image->description}' >";

That seems to be working fine and show the WEBP format on Chrome, Opera and Firefox under MacOS/Windows/Linux but show the original image version under Safari. I did not test with the Windows version of Safari since it is a long time not updated version and it won't make much sense to support the newer format anyway.

My question for you is if there is a simpler approach than my current to show WEBP images to the supported browsers and fallback to original If not?

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For one site I made some time ago I've tried to use the following "official" strategy:

Blogpost from Ryan / May 31, 2019

but, somehow the fallback didn't work on Safari and IE11. I didn't investigate further because I had to deliver the project and until then I've dropped that feature for now.
Your solution looks simple and elegant for me, I couldn't tell the difference against the .htaccess approach (I'm no expert by any mean).

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@MilenKo

Just a minor issue that caught my eyes: I would "cache" the webp support in eg. config.php so it shouldn't be evaluated on each function call:

$config->isWebpSupported = strpos($_SERVER['HTTP_ACCEPT'], 'image/webp') !== false;

if($config->isWebpSupported) {
  // ...

or use a static variable inside the function to evaluate only once:

function webp_support($imgURL)
{
    static $isWebpSupported = strpos($_SERVER['HTTP_ACCEPT'], 'image/webp') !== false;

    if($isWebpSupported) { 
    	// ...
    } else {
        // ...
    }
}

Note that I used "!== false" because if "image/webp" is at the beginning, the strpos gives 0, and it's false (not sure if it can be at 0 position, but it's a good practice to use like this imo).

(untested, haven't written PHP for months :))

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2 hours ago, MilenKo said:

I thought that Apple would have embraced the idea by now when several other browsers have already done that but it seemed like I was wrong.

Just in case you haven't come across this site before: https://caniuse.com/#search=webp

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Thanks @tpr for the static variable and "cache" approaches. I believe that after reading the @teppo detailed instructions about the different approaches, I would start using the <picture></picture> approach for new sites, however would give another try to the automatic webp conversions through .htaccess and code calls in the instructions. I have no doubt that in the next one or two versions, Apple would be having already the WEBP implemented which would simplify the things, however until then, it is good to know the best practices and most important, which way works best for us and users.

Since my profile is fully completed but it is not yet live since I am adding the content now, it won't hurt me to try all the kindly suggested approaches and see for myself which one to keep.

Btw, HAVE AN AMAZING AND PRODUCTIVE 2020 YEAR!

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On 1/2/2020 at 6:05 PM, 3fingers said:

For one site I made some time ago I've tried to use the following "official" strategy:

Blogpost from Ryan / May 31, 2019

but, somehow the fallback didn't work on Safari and IE11. I didn't investigate further because I had to deliver the project and until then I've dropped that feature for now.
Your solution looks simple and elegant for me, I couldn't tell the difference against the .htaccess approach (I'm no expert by any mean).

I also had the same trouble with strategy 2. So I switched to strategy 3, wich is a little more effort but better in my opinion. 😉

Regards, Andreas

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