call a rest to detect the file media type, the file exists in the file system.
but the header fetchKey cannot be processed correctly, it will lead to FileNotFound exception, as the fetchKey cannot be correctly submitted to server.
According to RFC of the HTTP/1.1 it is not possible sending non US-ASCII symbols in the HTTP headers, but the current mechanism in tika pipe(https://cwiki.apache.org/confluence/display/TIKA/tika-pipes#FileSystemEmitter) is trying to use http header to carry the file path information, it is very common that the file path contians none ascii chars.
Suggest to support http parameters for fetcherName and fetchKey. The http parameters can handle none ascii chars correctly.