refactor: simplify encoding negotiation logic

.github/workflows/ci.yml

@@ -39,6 +39,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         name:
         - Node.js 0.8

index.js

@@ -44,7 +44,7 @@ var cacheControlNoTransformRegExp = /(?:^|,)\s*?no-transform\s*?(?:,|$)/
 var SUPPORTED_ENCODING = hasBrotliSupport ? ['br', 'gzip', 'deflate', 'identity'] : ['gzip', 'deflate', 'identity']
 var PREFERRED_ENCODING = hasBrotliSupport ? ['br', 'gzip'] : ['gzip']
 
-var encodingSupported = ['*', 'gzip', 'deflate', 'identity', 'br']
+var encodingSupported = ['gzip', 'deflate', 'identity', 'br']
 
 /**
  * Compress response data with gzip / deflate.
@@ -200,7 +200,7 @@ function compression (options) {
 
       // if no method is found, use the default encoding
       if (!req.headers['accept-encoding'] && encodingSupported.indexOf(enforceEncoding) !== -1) {
-        method = enforceEncoding === '*' ? 'gzip' : enforceEncoding
+        method = enforceEncoding
       }
 
       // negotiation failed

test/compression.js

@@ -960,7 +960,7 @@ describe('compression()', function () {
         .expect(200, 'hello, world', done)
     })
 
-    it('should be gzip if no accept-encoding is sent when enforceEncoding is *', function (done) {
+    it('should not compress when enforceEnconding is *', function (done) {
       var server = createServer({ threshold: 0, enforceEncoding: '*' }, function (req, res) {
         res.setHeader('Content-Type', 'text/plain')
         res.end('hello, world')
@@ -969,8 +969,8 @@ describe('compression()', function () {
       request(server)
         .get('/')
         .set('Accept-Encoding', '')
-        .expect('Content-Encoding', 'gzip')
-        .expect(200, 'hello, world', done)
+        .expect(shouldNotHaveHeader('Content-Encoding'))
+        .expect(200, done)
     })
   })
 })