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add error logging guide section
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@ -134,3 +134,18 @@ fn index(req: HttpRequest) -> Result<&'static str> {
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```
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In this example *BAD REQUEST* response get generated for `MyError` error.
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## Error logging
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Actix logs all errors with `WARN` log level. If log level set to `DEBUG`
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and `RUST_BACKTRACE` is enabled, backtrace get logged. The Error type uses
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cause's error backtrace if available, if the underlying failure does not provide
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a backtrace, a new backtrace is constructed pointing to that conversion point
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(rather than the origin of the error). This construction only happens if there
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is no underlying backtrace; if it does have a backtrace no new backtrace is constructed.
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You can enable backtrace and debug logging with following command:
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```
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>> RUST_BACKTRACE=1 RUST_LOG=actix_web=debug cargo run
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```
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