compression.express.txt

                                  ┏━━━━━━━━━━━━━━━━━┓
                                  ┃   COMPRESSION   ┃
                                  ┗━━━━━━━━━━━━━━━━━┛

ALTERNATIVES ==>                  #  - Express compression (preferred with Express)
                                  #     - gzip|deflate|br
                                  #     - better logic
                                  #  - @middy/http-content-encoding (preferred with Middy)
                                  #     - gzip|deflate|br

VERSION ==>                       #1.8.0

COMPRESSION([OPTS])->EXPRESS_MDWR #Compresses RES
                                  #Do so by monkey-patching underlying RES.write|end|flush(), using ZLIB.createGzip|Deflate|BrotliCompress()

Accept-Encoding:
 identity|gzip|deflate|br [C]     #Used to determinate compression and which algo (using NEGOTIATOR, see its doc)
Cache-Control: no-transform [C]   #Do not compress if set

Vary: Accept-Encoding [S]         #Set
Content-Encoding:
 gzip|deflate|br [S]              #Set
Transfer-Encoding: chunked [S]    #Set
Content-Length [S]                #Unset

OPTS.filter                       #FUNC(REQ, RES)->BOOL. Only compress if returns true.
                                  #Def: uses compressible (see its doc)
OPTS.threshold                    #NUM (def: 1KB). Only compress if larger than that
                                  #Can be STR (uses bytes, see its doc)
OPTS.enforceEncoding              #STR|'*' (def: 'identity')
                                  #Default Accept-Encoding [C] if not specified

OPTS.*                            #Passed to ZLIB.createGzip|Deflate(OPTS)
OPTS.brotli                       #Passed to ZLIB.createBrotliCompress(OPTS.brotli)
                                  #Def quality: 4