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# ``twisted`.`web`.`http`.`PotentialDataLoss``

exception documentation

`class PotentialDataLoss(Exception): (source)`

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`PotentialDataLoss` may be raised by a transfer encoding decoder's `noMoreData` method to indicate that it cannot be determined if the entire response body has been delivered. This only occurs when making requests to HTTP servers which do not set Content-Length or a Transfer-Encoding in the response because in this case the end of the response is indicated by the connection being closed, an event which may also be due to a transient network problem or other error.