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# Caveats

## Uploading Files
Since file-upload is handled on RR end PHP process will only receive the filename of temporary resources.
This resource would not be registered in `uploaded files` hash and, as a result, function `is_uploaded_file` will always return `false`.

> Reference: https://github.com/spiral/roadrunner/issues/133

## Exit and Die functions
Please note that you should not use any of the following methods `die`, `exit`. Use buffered output if your library requires writing content to stdout.

## WinCache
Using roadrunner on Windows with WinCache extension might cause worker bytecode to stuck in memory.