HttpOpener shall be able to handle GZIP encoding

[dr0i]

HttpOpener , aka decode-html when speaking flux, is not able to decode gziped data atm.

This was discovered by @TobiasNx failing to lookup schema.org .

[dr0i]

Working on it I noticed

metafacture-core/metafacture-io/src/test/java/org/metafacture/io/HttpOpenerTest.java

Line 259 in 52e4141

r -> r.withHeader("Content-Encoding", "UTF-8")

This seems invalid because:

The content-encoding specifies the data transfer encoding used by the issuer of the content. UTF-8 is not a content encoding, it is a character set. Specifying the character set is done in the content-type header

(https://stackoverflow.com/questions/17154967/is-content-encoding-being-set-to-utf-8-invalid)

[EDIT] there seems a principal misunderstanding of encoding in HttpOpener as a synonym for charset. I Propose to rename variables and methods to charset , probably mark setEncoding(String) as deprecated.