So we have found identified the problem. As I've found in the documentation, Tapestry from version 5.1 compresses requests/responses and assets using gzip. obviously our websphere has some problem with this. Our solution is to disable this feature via configuration property tapestry.gzip-compression-enabled. This has fixed our problem. But from what I've quickly googled, it seems that Websphere indeed messes up something with HTTP headers and compression: http://fixunix.com/websphere/526204-websphere-seems-decompress-gzipped-requests-but-let-thecontent-encoding.html http://fixunix.com/websphere/526204-websphere-seems-decompress-gzipped-requests-but-let-thecontent-encoding.html Thanks for help anyway.
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