GzipHttpOutputInterceptor does not deflate when Accept-Encoding: * is in the request header.

[toffeegryphon]

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Jetty version(s) Up to 12.0.x

Jetty Environment core

Java version/vendor (use: java -version) Not relevant

OS type/version Not relevant

Description This doesn't really affect anything, but it is unexpected. According to RF9110 12.5.3,

The asterisk "*" symbol in an Accept-Encoding field matches any available content coding not explicitly listed in the field.

However, the HttpField class' contains method does not check for a lone * character. So when Accept-Encoding: * is passed as a request header, the GzipHandler's getDeflaterEntry believes that gzip is not accepted, and returns null.

How to reproduce? Run a simple web server with the GzipHandler installed, and send a request with Accept-Encoding: *. The response will not contain the Content-Encoding: gzip header, and the body will not be compressed.