500 error code 原因

for 7, refer to :

https://stackoverflow.com/questions/17693391/500-internal-server-error-for-php-file-not-for-html

https://www.a2hosting.com/kb/developer-corner/php/500-internal-server-error-while-running-php

refer:

https://www.ionos.com/digitalguide/hosting/technical-matters/http-error-500-internal-server-error/

Permission error: The permissions of the main files and folders are not set correctly.

PHP timeout: The script tries to access an external resource and experiences a timeout.

Incorrect code in .htaccess: The structure in a .htaccess file could be wrong.

Error in syntax or code in CGI/Perl scripts: In some cases, scripts are incorrect. Paths, especially, can be misaligned.

PHP memory limit: A process exceeds memory and therefore cannot be executed correctly.

https://www.sejuku.net/blog/77760

html_iframe.az：是一种网页病毒，通过浏览感染电脑。

查杀：腾讯电脑管家，卡巴斯基等主流杀毒软件都可以进行查杀。

防护：开启杀毒软件的主动防护，在病毒扩散之前会提前对此类病毒进行隔离。

查杀病毒之前应将安全软件更新到最新版本，并且更新杀毒软件的病毒库。

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