Shared hosting owner may try to contact hosting provider, but providers may not enable allow_url_fopen
Server can open "/usr/local/lib/php.ini" (if its empty then he have to find file in different location)
Modify following lines and insert them at the bottom of the opened php.ini file:
PATH is the path to the script that requires allow_url_fopen, sometimes it is needed to use root directory of the content management system[PATH=/home/myusername/public_html]
allow_url_fopen=on
Save file, no need to restart anything, just reload page in web browser by Ctrl+F5
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