fix this.status= in this.body

fix default status set bug in this.body=null.
do not call this.status= if this.status exist.
make sure empty content status remove content headers

lib/application.js

@@ -177,7 +177,11 @@ function *respond(next) {
   var head = 'HEAD' == this.method;
 
   // ignore body
-  if (status.empty[code]) return res.end();
+  if (status.empty[code]) {
+    // strip headers
+    this.body = null;
+    return res.end();
+  }
 
   if (null == body) {
     // empty body

lib/response.js

@@ -100,8 +100,7 @@ module.exports = {
 
     // no content
     if (null == val) {
-      var s = this.status;
-      this.status = 304 == s ? 304 : 204;
+      if (!status.empty[this.status]) this.status = 204;
       this.res.removeHeader('Content-Type');
       this.res.removeHeader('Content-Length');
       this.res.removeHeader('Transfer-Encoding');
@@ -109,7 +108,7 @@ module.exports = {
     }
 
     // set the status
-    this.status = this.status || 200;
+    if (!this.status) this.status = 200;
 
     // set the content-type only if not yet set
     var setType = !this.header['content-type'];

test/application.js

@@ -362,6 +362,95 @@ describe('app.respond', function(){
     })
   })
 
+  describe('when .body is a null', function(){
+    it('should respond 204 by default', function(done){
+      var app = koa();
+
+      app.use(function *(){
+        this.body = null;
+      })
+
+      var server = app.listen();
+
+      request(server)
+      .get('/')
+      .expect(204)
+      .expect('')
+      .end(function(err, res){
+        if (err) return done(err);
+
+        res.header.should.not.have.property('content-type');
+        done();
+      })
+    })
+
+    it('should respond 204 with status=200', function(done){
+      var app = koa();
+
+      app.use(function *(){
+        this.status = 200;
+        this.body = null;
+      })
+
+      var server = app.listen();
+
+      request(server)
+      .get('/')
+      .expect(204)
+      .expect('')
+      .end(function(err, res){
+        if (err) return done(err);
+
+        res.header.should.not.have.property('content-type');
+        done();
+      })
+    })
+
+    it('should respond 205 with status=205', function(done){
+      var app = koa();
+
+      app.use(function *(){
+        this.status = 205;
+        this.body = null;
+      })
+
+      var server = app.listen();
+
+      request(server)
+      .get('/')
+      .expect(205)
+      .expect('')
+      .end(function(err, res){
+        if (err) return done(err);
+
+        res.header.should.not.have.property('content-type');
+        done();
+      })
+    })
+
+    it('should respond 304 with status=304', function(done){
+      var app = koa();
+
+      app.use(function *(){
+        this.status = 304;
+        this.body = null;
+      })
+
+      var server = app.listen();
+
+      request(server)
+      .get('/')
+      .expect(304)
+      .expect('')
+      .end(function(err, res){
+        if (err) return done(err);
+
+        res.header.should.not.have.property('content-type');
+        done();
+      })
+    })
+  })
+
   describe('when .body is a string', function(){
     it('should respond', function(done){
       var app = koa();
@@ -545,6 +634,46 @@ describe('app.respond', function(){
       .end(done);
     })
   })
+
+  describe('when status and body property', function(){
+    it('should 200', function(done){
+      var app = koa();
+
+      app.use(function *(){
+        this.status = 304;
+        this.body = 'hello';
+        this.status = 200;
+      });
+
+      var server = app.listen();
+
+      request(server)
+      .get('/')
+      .expect(200)
+      .expect('hello', done);
+    })
+
+    it('should 204', function(done) {
+      var app = koa();
+
+      app.use(function *(){
+        this.status = 200;
+        this.body = 'hello';
+        this.set('content-type', 'text/plain; charset=utf8');
+        this.status = 204;
+      });
+
+      var server = app.listen();
+
+      request(server)
+      .get('/')
+      .expect(204)
+      .end(function (err, res) {
+        res.should.not.have.header('content-type');
+        done(err);
+      });
+    });
+  })
 })
 
 describe('app.context', function(){

test/response/status.js

@@ -54,7 +54,36 @@ describe('res.status=', function(){
       request(app.listen())
         .get('/')
         .expect(status)
-        .end(done);
+        .end(function(err, res) {
+          res.should.not.have.header('content-type');
+          res.should.not.have.header('content-length');
+          res.should.not.have.header('content-encoding');
+          res.text.should.have.length(0);
+          done(err);
+        });
+    })
+
+    it('should strip content releated header fields after status set', function(done) {
+      var app = koa();
+
+      app.use(function *(){
+        this.status = status;
+        this.body = { foo: 'bar' };
+        this.set('Content-Type', 'application/json');
+        this.set('Content-Length', '15');
+        this.set('Transfer-Encoding', 'chunked');
+      });
+
+      request(app.listen())
+        .get('/')
+        .expect(status)
+        .end(function(err, res) {
+          res.should.not.have.header('content-type');
+          res.should.not.have.header('content-length');
+          res.should.not.have.header('content-encoding');
+          res.text.should.have.length(0);
+          done(err);
+        });
     })
   }
 
@@ -62,6 +91,10 @@ describe('res.status=', function(){
     strip(204);
   })
 
+  describe('when 205', function(){
+    strip(205);
+  })
+
   describe('when 304', function(){
     strip(304);
   })