http://bamboofox.cs.nctu.edu.tw:8005/ (Backup Server)
Hey, I just learned how to make a web application!
Even though I might create some vulnerabilities, but I bet you'll never get the flag!
The submitted files will be deleted every hour.
It seems like you need to create a file and write some code for server.
If you lookup with web source code, you can find somthing below:
Then you can try to link "http://bamboofox.cs.nctu.edu.tw:8005/myfirstweb/index.php?op=nav&link=hint", and find out the hint "Flag is in ../flag.txt".
That's all, see "http://bamboofox.cs.nctu.edu.tw:8005/flag.txt" to get the flag. ^_^