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As part of WAPT, you want to test uploading a php shell on the server, however the server doesn't allow uploading files with the '.php' extension. Which of these might solve your problem?
Use an extension that apache does not know, like '.blah_blah'
All of these
Change the .php extension to .php3 or .php4
Upload a .htaccess file
All of these are potential ways of trying to upload a backdoor on the server when it doesn't allow uploading .php files.
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