Title: Problem generating thumbnails
Last modified: August 30, 2016

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# Problem generating thumbnails

 *  Resolved [Christoph](https://wordpress.org/support/users/camthor/)
 * (@camthor)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/problem-generating-thumbnails/)
 * Hi,
 * the src URL of the images seems to be created without the protocol (like //www.
   robothumb.com/src/%3Furl=http://www.weirdthingsinprague.com&size=120×90 ), which
   causes a problem if I view the page via https. I think that robothumb does not
   support SSL. If I use “http” then all is fine.
 * Thanks
 * EDIT: Seems to be only the case if “Use thumbnail service for dynamic link images”
   is checked.
 * [https://wordpress.org/plugins/link-library/](https://wordpress.org/plugins/link-library/)

Viewing 6 replies - 1 through 6 (of 6 total)

 *  Plugin Author [Yannick Lefebvre](https://wordpress.org/support/users/jackdewey/)
 * (@jackdewey)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/problem-generating-thumbnails/#post-6537269)
 * Hi Chris, I have checked in the plugin code and there is a specific http reference
   in front of the URL for these images. Perhaps it’s more at the browser that it
   won’t let you load images via http when the page is rendered via https? I will
   have to do some research on this topic to see what can be done.
 * When you say that the http seems to be missing, is that when you look at the 
   page source code or when you inspect the element using your browser’s developer
   tools?
 *  Thread Starter [Christoph](https://wordpress.org/support/users/camthor/)
 * (@camthor)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/problem-generating-thumbnails/#post-6537271)
 * Hi,
 * I can see it also in the HTML source code.
 *     ```
       <img src="//www.robothumb.com/src/?url=http://www.weirdthingsinprague.com&size=120x90"</td><td>
       ```
   
 * (also the closing tag of img seems to be missing…)
 * I have published now the page if you want to check yourself:
    [http://unterwegs-in-tschechien.cz/ressourcen/](http://unterwegs-in-tschechien.cz/ressourcen/)
   [https://unterwegs-in-tschechien.cz/ressourcen/](https://unterwegs-in-tschechien.cz/ressourcen/)
 *  Thread Starter [Christoph](https://wordpress.org/support/users/camthor/)
 * (@camthor)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/problem-generating-thumbnails/#post-6537286)
 * PS: I am using a plugin for caching and Cloudflare, so it is possible that the
   URLs get changed on the way. (But I would not understand why they would do that…)
 *  Plugin Author [Yannick Lefebvre](https://wordpress.org/support/users/jackdewey/)
 * (@jackdewey)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/problem-generating-thumbnails/#post-6537407)
 * Can you temporarily turn off these plugins to see if the URLs go back to normal?
   If they do, then it might be more on that side to see if there is any option 
   to stop what they are doing.
 *  Thread Starter [Christoph](https://wordpress.org/support/users/camthor/)
 * (@camthor)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/problem-generating-thumbnails/#post-6537447)
 * The Clodflare plugin is the “culprit”: I have the option “HTTPS Protocol Rewriting”
   enabled. On the other hand, without it, visitors get mixed content warnings.
 * See [https://blog.cloudflare.com/flexible-ssl-wordpress-fixing-mixed-content-errors/](https://blog.cloudflare.com/flexible-ssl-wordpress-fixing-mixed-content-errors/)
 * So I solved it by unchecking “Use thumbnail service for dynamic link images”.
   Dynamic images don’t seem to be necessary.
 *  Plugin Author [Yannick Lefebvre](https://wordpress.org/support/users/jackdewey/)
 * (@jackdewey)
 * [10 years, 9 months ago](https://wordpress.org/support/topic/problem-generating-thumbnails/#post-6537454)
 * Good to hear you found a solution. The ‘Use thumbnail service for dynamic link
   images’ is only needed when you want to load thumbnail images directly from the
   image generation service. If you generate the images and store them on your server,
   you can leave that option off.
 * Please consider donating to support this plugin’s development.

Viewing 6 replies - 1 through 6 (of 6 total)

The topic ‘Problem generating thumbnails’ is closed to new replies.

 * ![](https://ps.w.org/link-library/assets/icon-256x256.jpg?rev=971117)
 * [Link Library](https://wordpress.org/plugins/link-library/)
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 * 6 replies
 * 2 participants
 * Last reply from: [Yannick Lefebvre](https://wordpress.org/support/users/jackdewey/)
 * Last activity: [10 years, 9 months ago](https://wordpress.org/support/topic/problem-generating-thumbnails/#post-6537454)
 * Status: resolved