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Remove `Content-Length` header when encoding response content

3

Hi, as mentioned in a comment https://github.com/eclipse-ee4j/jersey/blob/21325cbb9dfe6392f1df972fb1f7f7f0275b3c85/core-common/src/main/java/org/glassfish/jersey/spi/ContentEncoder.java#L107 the `Content-Length` header needs to be removed when the response content is encoded as e.g. gzip because that likely changes the length.