Switch default encoding to gzip for now

[nyurik]

GZip is significantly faster, so for now lets use that until brotli project gains some performance, and until we get proper after-compression caching.

[sharkAndshark]

martin/martin/src/srv/tiles.rs

Lines 200 to 204 in 7107db5

	if tile.info.encoding == Encoding::Uncompressed {
	let ordered_encodings = match self.preferred_enc {
	Some(PreferredEncoding::Gzip) => PREFER_GZIP_ENC,
	Some(PreferredEncoding::Brotli) | None => PREFER_BROTLI_ENC,
	};

Seems this should be updated

[sharkAndshark]

martin/martin/src/srv/tiles.rs

Lines 281 to 297 in 7107db5

	for (accept_encodings, prefered_encoding, result_encoding) in [
	(
	Some(AcceptEncoding(vec![
	"gzip;q=1".parse().unwrap(),
	"br;q=1".parse().unwrap(),
	])),
	Some(PreferredEncoding::Brotli),
	Encoding::Brotli,
	),
	(
	Some(AcceptEncoding(vec![
	"gzip;q=1".parse().unwrap(),
	"br;q=0.5".parse().unwrap(),
	])),
	Some(PreferredEncoding::Brotli),
	Encoding::Gzip,
	),

And maybe more tests should be added or updated here.

[nyurik]

Thx @sharkAndshark! Turns out it was never properly working -- it was always using the list of accepted encoding and ignored the order of the supported encodings... So we may have to rework that code. I re-worked the tests and removed the confusing default, but this is currently broken. Will try to get back to it soonish

[sharkAndshark]

Hi @nyurik I make a PR to this, Could you give it a review?