shunping commented on issue #31040:
URL: https://github.com/apache/beam/issues/31040#issuecomment-2569771603

   Notice that when `content-type=application/gzip` and 
`content-encoding=gzip`, GCS considers the file is doubly 
compressed(https://cloud.google.com/storage/docs/transcoding#gzip-gzip), which 
is against the actual content we store here (aka. a gzipped text file). 
Therefore, an exception is thrown there.
   
   For any `UnicodeDecodeError`, most of them are due to the fact that users 
specifies "UNCOMPRESSED" on a gzip file. We can let it be this way, or we can 
give a better and more informative error if "content-type" and/or 
"content-encoding" does not match the specified "compression type". 
   
   @kennknowles WDYT?


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