How to Fix wordpres HTTP Error When Uploading Images

Correcting the HTTP Upload Error

1.put the following code into functions.php file. It works mostly.

add_filter( 'wp_image_editors', 'change_graphic_lib' );
function change_graphic_lib($array) {
return array( 'WP_Image_Editor_GD', 'WP_Image_Editor_Imagick' );
}

2.Edit .htaccess file.

1. Add the following line of code at the top of the file:
   SetEnv MAGICK_THREAD_LIMIT 1

3.mod_security might be causing problems. Disable it to see if that is the problem. To do this, make an .htaccess file in your wp-admin directory. Add this to it:

SecFilterEngine Off
SecFilterScanPOST Off