Uploads uploading but not rendering in Media

[sherrynes]

Many users have the same issue - they try to upload an image via "Media" and get an error that simply says, "HTTP error." They and I believe the image wasn't uploading.

But when I checked my uploads folder via FTP, the uploads were there - in all the rendered sizes.

So the HTTP error seems to be in rendering the thumbnail on the Media page and for editing. When switching to "List View," you can see that the image is listed there.

[swissspidy]

Hey there! Thanks for your report and welcome to trac.

IIRC, the "HTTP error" happens when the upload doesn't work correctly, e.g. when it aborted in the middle of an upload or it couldn't save the files. What I can tell from my experience is that this is mostly caused by some server misconfiguration.

Normally, this is something you should report on the ​WordPress.org support forums. There you'll find lots of threads about this topic.

Please try to following steps so we can make sure this isn't a bug in core:

1. Deactivate all plugins, switch to one of the default themes.
2. Increase PHP memory limit by defining define('WP_MEMORY_LIMIT', '64MB'); in your wp-config.php file. Also try a higher value, like 128MB.
3. Check ​mod_security settings
4. Ask your hoster for help.

See also: #22869, #28233, #20936