Problems with CGI Scripts

• Syntax problems
  • Syntax error in the script itself
• Permission problems
  • CGI script cannot execute (execute bit not turned on)
  • Script has wrong permissions
• Semantic problems
  • Script violates HTTP protocol (e.g., forgetting to send "Content-Type: text/html" before any other output)
• Termination problems
  • Script calls exit or die
  • Script calls an illegal function (e.g., symlink on Windows)

The DBI::connect subroutine could cause Perl to terminate.

Review

Why do we care so much about dealing with these problems?