diff --git a/digest-fetch-src.js b/digest-fetch-src.js
index 85b5e20..26d623e 100644
--- a/digest-fetch-src.js
+++ b/digest-fetch-src.js
@@ -12,6 +12,14 @@ const base64 = require('base-64')
 
 const supported_algorithms = ['MD5', 'MD5-sess']
 
+// challenge = auth-scheme 1*SP 1#auth-param
+
+const tokenRegexp = '[!#-\'*+-.0-9A-Z^_`a-z~]+'
+const schemeRegexp = tokenRegexp
+const paramRegexp = tokenRegexp+'='+'('+tokenRegexp+'|"([^"\\\\]|\\\\.)*")'
+
+const challengeRegexp = new RegExp('^(('+schemeRegexp+') +'+paramRegexp+'( *, *'+paramRegexp+')*) *(, *'+schemeRegexp+' .*)?$')
+
 const parse = (raw, field, trim=true) => {
   const regex = new RegExp(`${field}=("[^"]*"|[^,]*)`, "i")
   const match = regex.exec(raw)
@@ -117,7 +125,7 @@ class DigestClient {
 
     const opaqueString = this.digest.opaque !== null ? `opaque="${this.digest.opaque}",` : ''
     const qopString = this.digest.qop ? `qop="${this.digest.qop}",` : ''
-    const digest = `${this.digest.scheme} username="${this.user}",realm="${this.digest.realm}",\
+    const digest = `Digest username="${this.user}",realm="${this.digest.realm}",\
 nonce="${this.digest.nonce}",uri="${uri}",${opaqueString}${qopString}\
 algorithm="${this.digest.algorithm}",response="${response}",nc=${ncString},cnonce="${this.digest.cnonce}"`
     options.headers = options.headers || {}
@@ -140,19 +148,38 @@ algorithm="${this.digest.algorithm}",response="${response}",nc=${ncString},cnonc
     }
 
     this.hasAuth = true
-    
-    this.digest.scheme = h.split(/\s/)[0]
+    while (true) {
+      const challengeMatch = h.match(challengeRegexp)
+      if (!challengeMatch) {
+        break
+      }
+      const challenge = challengeMatch[1]
+      const scheme = challengeMatch[2]
+
+      if (scheme.match(/^Digest$/i)) {
 
-    this.digest.realm = (parse(h, 'realm', false) || '').replace(/["]/g, '')
+        this.digest.realm = (parse(challenge, 'realm', false) || '').replace(/["]/g, '')
 
-    this.digest.qop = this.parseQop(h)
+        this.digest.qop = this.parseQop(challenge)
 
-    this.digest.opaque = parse(h, 'opaque')
-    
-    this.digest.nonce = parse(h, 'nonce') || ''
+        this.digest.opaque = parse(challenge, 'opaque')
 
-    this.digest.cnonce = this.makeNonce()
-    this.digest.nc++
+        this.digest.nonce = parse(challenge, 'nonce') || ''
+
+        this.digest.cnonce = this.makeNonce()
+        this.digest.nc++
+      }
+      h = h.substr(challenge.length)
+      if (!h) {
+        break
+      }
+      const comma = h.match("^( *, *).*")
+      if (!comma) {
+        // TODO: parse error
+        break
+      }
+      h = h.substr(comma[1].length)
+    }
   }
 
   parseQop (rawAuth) {
diff --git a/test/digest-fetch-basic.js b/test/digest-fetch-basic.js
index a6c62a3..0b7bc21 100644
--- a/test/digest-fetch-basic.js
+++ b/test/digest-fetch-basic.js
@@ -13,18 +13,40 @@ var app = factory.getApp()
 
 describe('digest-fetch', function(){
 
-  it('Test Basic Authentication', function() {
+  it('Test Basic Authentication', function(done) {
     var client = new DigestFetch('test', 'test', { basic: true })
     const auth = client.addBasicAuth().headers.Authorization
     chai.request(app).get('/basic').set('Authorization', auth).then(res => {
       expect(res).to.have.status(200)
+      done()
     })
+    .catch(done)
   })
-  it('Test Basic Authentication with wrong credential', function() {
+  it('Test Basic Authentication with wrong credential', function(done) {
     var client = new DigestFetch('test', 'test-null', { basic: true })
     const auth = client.addBasicAuth().headers.Authorization
     chai.request(app).get('/basic').set('Authorization', auth).then(res => {
       expect(res).to.have.status(401)
+      done()
     })
+    .catch(done)
+  })
+  it('Test Basic Authentication with basic-and-digest', function(done) {
+    var client = new DigestFetch('test', 'test', { basic: true })
+    const auth = client.addBasicAuth().headers.Authorization
+    chai.request(app).get('/basic-and-digest').set('Authorization', auth).then(res => {
+      expect(res).to.have.status(200)
+      done()
+    })
+    .catch(done)
+  })
+  it('Test Basic Authentication with digest-and-basic', function(done) {
+    var client = new DigestFetch('test', 'test', { basic: true })
+    const auth = client.addBasicAuth().headers.Authorization
+    chai.request(app).get('/digest-and-basic').set('Authorization', auth).then(res => {
+      expect(res).to.have.status(200)
+      done()
+    })
+    .catch(done)
   })
 })
diff --git a/test/digest-fetch-rfc2069.js b/test/digest-fetch-rfc2069.js
index ff8d6db..6ca3b56 100644
--- a/test/digest-fetch-rfc2069.js
+++ b/test/digest-fetch-rfc2069.js
@@ -13,7 +13,7 @@ var app = factory.getApp()
 
 describe('digest-fetch', function(){
 
-  it('Test RFC2069', function() {
+  it('Test RFC2069', function(done) {
     var client = new DigestFetch('test', 'test')
     chai.request(app).get('/auth').then(res => {
       expect(res).to.have.status(401)
@@ -24,11 +24,14 @@ describe('digest-fetch', function(){
       const auth = client.addAuth('/auth', { method: 'GET' }).headers.Authorization
       chai.request(app).get('/auth').set('Authorization', auth).then(res => {
         expect(res).to.have.status(200)
+        done()
       })
+      .catch(done)
     })
+    .catch(done)
   })
 
-  it('Test RFC2069 with wrong credential', function() {
+  it('Test RFC2069 with wrong credential', function(done) {
     var client = new DigestFetch('test', 'test-null')
     chai.request(app).get('/auth').then(res => {
       res.should.have.status(401)
@@ -39,7 +42,10 @@ describe('digest-fetch', function(){
       const auth = client.addAuth('/auth', { method: 'GET' }).headers.Authorization
       chai.request(app).get('/auth').set('Authorization', auth).then(res => {
         expect(res).to.have.status(401)
+        done()
       })
+      .catch(done)
     })
+    .catch(done)
   })
 })
diff --git a/test/digest-fetch-rfc2617.js b/test/digest-fetch-rfc2617.js
index 747e596..f3a4ab3 100644
--- a/test/digest-fetch-rfc2617.js
+++ b/test/digest-fetch-rfc2617.js
@@ -13,7 +13,7 @@ var app = factory.getApp('auth')
 
 describe('digest-fetch', function(){
 
-  it('Test RFC2617', function() {
+  it('Test RFC2617', function(done) {
     var client = new DigestFetch('test', 'test')
     chai.request(app).get('/auth').then(res => {
       expect(res).to.have.status(401)
@@ -24,11 +24,14 @@ describe('digest-fetch', function(){
       const auth = client.addAuth('/auth', { method: 'GET' }).headers.Authorization
       chai.request(app).get('/auth').set('Authorization', auth).then(res => {
         expect(res).to.have.status(200)
+        done()
       })
+      .catch(done)
     })
+    .catch(done)
   })
 
-  it('Test RFC2617 with precomputed hash', function() {
+  it('Test RFC2617 with precomputed hash', function(done) {
     var client = new DigestFetch('test', DigestFetch.computeHash('test', 'Users', 'test'), { precomputedHash: true })
     chai.request(app).get('/auth').then(res => {
       expect(res).to.have.status(401)
@@ -39,11 +42,14 @@ describe('digest-fetch', function(){
       const auth = client.addAuth('/auth', { method: 'GET' }).headers.Authorization
       chai.request(app).get('/auth').set('Authorization', auth).then(res => {
         expect(res).to.have.status(200)
+        done()
       })
+      .catch(done)
     })
+    .catch(done)
   })
 
-  it('Test RFC2617 with wrong credential', function() {
+  it('Test RFC2617 with wrong credential', function(done) {
     var client = new DigestFetch('test', 'test-null')
     chai.request(app).get('/auth').then(res => {
       expect(res).to.have.status(401)
@@ -54,7 +60,48 @@ describe('digest-fetch', function(){
       const auth = client.addAuth('/auth', { method: 'GET' }).headers.Authorization
       chai.request(app).get('/auth').set('Authorization', auth).then(res => {
         expect(res).to.have.status(401)
+        done()
       })
+      .catch(done)
     })
+    .catch(done)
+  })
+
+  it('Test RFC2617 with basic-and-digest', function(done) {
+    var client = new DigestFetch('test', 'test')
+    chai.request(app).get('/basic-and-digest').then(res => {
+      expect(res).to.have.status(401)
+      client.lastAuth = res.res.headers['www-authenticate']
+    })
+    .then(() => {
+      client.parseAuth(client.lastAuth)
+      const auth = client.addAuth('/basic-and-digest', { method: 'GET' }).headers.Authorization
+      expect(auth).to.match(/^Digest /)
+      chai.request(app).get('/basic-and-digest').set('Authorization', auth).then(res => {
+        expect(res).to.have.status(200)
+        done()
+      })
+      .catch(done)
+    })
+    .catch(done)
+  })
+
+  it('Test RFC2617 with digest-and-basic', function(done) {
+    var client = new DigestFetch('test', 'test')
+    chai.request(app).get('/digest-and-basic').then(res => {
+      expect(res).to.have.status(401)
+      client.lastAuth = res.res.headers['www-authenticate']
+    })
+    .then(() => {
+      client.parseAuth(client.lastAuth)
+      const auth = client.addAuth('/digest-and-basic', { method: 'GET' }).headers.Authorization
+      expect(auth).to.match(/^Digest /)
+      chai.request(app).get('/digest-and-basic').set('Authorization', auth).then(res => {
+        expect(res).to.have.status(200)
+        done()
+      })
+      .catch(done)
+    })
+    .catch(done)
   })
 })
diff --git a/test/digest-fetch.js b/test/digest-fetch.js
index 5804f2b..50b62f2 100644
--- a/test/digest-fetch.js
+++ b/test/digest-fetch.js
@@ -24,9 +24,9 @@ describe('digest-fetch', function(){
     assert.equal(DigestFetch.parse('a="v2",', 'a'), 'v2')
     assert.equal(DigestFetch.parse('a="v1,v2"', 'a'), 'v1,v2')
     const client = new DigestFetch("", "")
-    client.parseAuth('qop=auth-int,realm=test')
+    client.parseAuth('Digest qop=auth-int,realm=test',1)
     assert.equal(client.digest.realm, "test")
-    client.parseAuth('qop="auth",realm="v1 v2"')
+    client.parseAuth('Digest qop="auth",realm="v1 v2"')
     assert.equal(client.digest.realm, "v1 v2")
   })
 
diff --git a/test/test-server.js b/test/test-server.js
index 611195f..a9d4684 100644
--- a/test/test-server.js
+++ b/test/test-server.js
@@ -53,6 +53,18 @@ module.exports = { getApp(method) {
     function(req, res) {
       res.json(req.user);
   });
+  // http basic and digest authentication
+  app.get('/basic-and-digest',
+    passport.authenticate(['basic', 'digest'], { session: false }),
+    function(req, res) {
+      res.json(req.user);
+  });
+  // http digest and basic authentication
+  app.get('/digest-and-basic',
+    passport.authenticate(['digest','basic'], { session: false }),
+    function(req, res) {
+      res.json(req.user);
+  });
 
 
   // app.use("/static", express.static(path.join(__dirname, './static')));