Content-length removed due to double headers issue #14
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Recent changes in the swipl library seem to have added internal content-length support, whereas the tus protocol implementation added two additional content-length specifications that are now obsolete. The issues caused a double Content-length header which made tus violate header specifications and fail protocol validation of modern reverse proxies such as Nginx and Envoy.
By removing the Content-length specification from the tus library, the Content-length header is correctly added when necessary without adding the header manually.