# static file server callback function for Ulfius Framework
Provides a simple static file server. `user_data` must be initialized with a `struct static_file_config` containing the following informations:
- `files_path`: path to the DocumentRoot folder, can be relative or absolute
- `mime_types`: a `struct _u_map` containing a set of mime-types with file extension as key and mime-type as value
- `map_header`: a `struct _u_map` containing a set of headers that will be added to all responses within the `static_file_callback`
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