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22.3. Runtime

Once you have your server up and running and most of the code working correctly, you may still encounter errors generated by your code at runtime. Some possible errors are discussed in this section.

22.3.1. foo ... at /dev/null line 0

Under mod_perl, you may receive a warning or an error in the error_log file that specifies /dev/null as the source file and line 0 as the line number where the printing of the message was triggered. This is quite normal if the code is executed from within a handler, because there is no actual file associated with the handler. Therefore, $0 is set to /dev/null, and that's what you see.

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