http: Enable Transfer-Encoding chunked transfer

Fixes #1020

api-headers.go

@@ -32,7 +32,7 @@ import (
 // Static alphaNumeric table used for generating unique request ids
 var alphaNumericTable = []byte("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ")
 
-// generateRequestID generate request id
+// generateRequestID - Generate request id
 func generateRequestID() []byte {
 	alpha := make([]byte, 16)
 	rand.Read(alpha)
@@ -43,14 +43,11 @@ func generateRequestID() []byte {
 }
 
 // Write http common headers
-func setCommonHeaders(w http.ResponseWriter, contentLength int) {
+func setCommonHeaders(w http.ResponseWriter) {
-	// set unique request ID for each reply
+	// Set unique request ID for each reply.
 	w.Header().Set("X-Amz-Request-Id", string(generateRequestID()))
 	w.Header().Set("Server", ("Minio/" + minioReleaseTag + " (" + runtime.GOOS + "; " + runtime.GOARCH + ")"))
 	w.Header().Set("Accept-Ranges", "bytes")
-	w.Header().Set("Connection", "close")
-	// should be set to '0' by default
-	w.Header().Set("Content-Length", strconv.Itoa(contentLength))
 }
 
 // Write error response headers
@@ -68,12 +65,15 @@ func setObjectHeaders(w http.ResponseWriter, metadata fs.ObjectMetadata, content
 	// set common headers
 	if contentRange != nil {
 		if contentRange.length > 0 {
-			setCommonHeaders(w, int(contentRange.length))
+			w.Header().Set("Content-Length", strconv.FormatInt(contentRange.length, 10))
+			setCommonHeaders(w)
 		} else {
-			setCommonHeaders(w, int(metadata.Size))
+			w.Header().Set("Content-Length", strconv.FormatInt(metadata.Size, 10))
+			setCommonHeaders(w)
 		}
 	} else {
-		setCommonHeaders(w, int(metadata.Size))
+		w.Header().Set("Content-Length", strconv.FormatInt(metadata.Size, 10))
+		setCommonHeaders(w)
 	}
 	// set object headers
 	lastModified := metadata.Created.Format(http.TimeFormat)

api-response.go

@@ -206,15 +206,20 @@ func generateListMultipartUploadsResponse(bucket string, metadata fs.BucketMulti
 	return listMultipartUploadsResponse
 }
 
-// writeSuccessResponse write success headers
+// writeSuccessResponse write success headers and response if any.
-func writeSuccessResponse(w http.ResponseWriter) {
+func writeSuccessResponse(w http.ResponseWriter, response []byte) {
-	setCommonHeaders(w, 0)
+	setCommonHeaders(w)
-	w.WriteHeader(http.StatusOK)
+	if response == nil {
+		w.WriteHeader(http.StatusOK)
+		return
+	}
+	w.Write(response)
+	w.(http.Flusher).Flush()
 }
 
 // writeSuccessNoContent write success headers with http status 204
 func writeSuccessNoContent(w http.ResponseWriter) {
-	setCommonHeaders(w, 0)
+	setCommonHeaders(w)
 	w.WriteHeader(http.StatusNoContent)
 }
 
@@ -225,12 +230,13 @@ func writeErrorResponse(w http.ResponseWriter, req *http.Request, errorType int,
 	errorResponse := getErrorResponse(error, resource)
 	encodedErrorResponse := encodeErrorResponse(errorResponse)
 	// set common headers
-	setCommonHeaders(w, len(encodedErrorResponse))
+	setCommonHeaders(w)
 	// write Header
 	w.WriteHeader(error.HTTPStatusCode)
 	// HEAD should have no body, do not attempt to write to it
 	if req.Method != "HEAD" {
 		// write error body
 		w.Write(encodedErrorResponse)
+		w.(http.Flusher).Flush()
 	}
 }

appveyor.yml

@@ -14,9 +14,6 @@ environment:
 # scripts that run after cloning repository
 install:
   - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
-  - rd C:\Go /s /q
-  - appveyor DownloadFile https://storage.googleapis.com/golang/go1.5.1.windows-amd64.zip
-  - 7z x go1.5.1.windows-amd64.zip -oC:\ >nul
   - go version
   - go env
 

bucket-handlers.go

@@ -58,8 +58,8 @@ func (api CloudStorageAPI) GetBucketLocationHandler(w http.ResponseWriter, req *
 	//       we bring in a mechanism of configurable regions. For the time being
 	//       default region is empty i.e 'us-east-1'.
 	encodedSuccessResponse := encodeSuccessResponse(LocationResponse{}) // generate response
-	setCommonHeaders(w, len(encodedSuccessResponse))                    // write headers
+	setCommonHeaders(w)                                                 // write headers
-	w.Write(encodedSuccessResponse)                                     // write body
+	writeSuccessResponse(w, encodedSuccessResponse)
 }
 
 // ListMultipartUploadsHandler - GET Bucket (List Multipart uploads)
@@ -104,10 +104,10 @@ func (api CloudStorageAPI) ListMultipartUploadsHandler(w http.ResponseWriter, re
 	// generate response
 	response := generateListMultipartUploadsResponse(bucket, resources)
 	encodedSuccessResponse := encodeSuccessResponse(response)
-	// write headers
+	// write headers.
-	setCommonHeaders(w, len(encodedSuccessResponse))
+	setCommonHeaders(w)
-	// write body
+	// write success response.
-	w.Write(encodedSuccessResponse)
+	writeSuccessResponse(w, encodedSuccessResponse)
 }
 
 // ListObjectsHandler - GET Bucket (List Objects)
@@ -139,13 +139,13 @@ func (api CloudStorageAPI) ListObjectsHandler(w http.ResponseWriter, req *http.R
 
 	objects, resources, err := api.Filesystem.ListObjects(bucket, resources)
 	if err == nil {
-		// generate response
+		// Generate response
 		response := generateListObjectsResponse(bucket, objects, resources)
 		encodedSuccessResponse := encodeSuccessResponse(response)
-		// write headers
+		// Write headers
-		setCommonHeaders(w, len(encodedSuccessResponse))
+		setCommonHeaders(w)
-		// write body
+		// Write success response.
-		w.Write(encodedSuccessResponse)
+		writeSuccessResponse(w, encodedSuccessResponse)
 		return
 	}
 	switch err.ToGoError().(type) {
@@ -180,9 +180,9 @@ func (api CloudStorageAPI) ListBucketsHandler(w http.ResponseWriter, req *http.R
 		response := generateListBucketsResponse(buckets)
 		encodedSuccessResponse := encodeSuccessResponse(response)
 		// write headers
-		setCommonHeaders(w, len(encodedSuccessResponse))
+		setCommonHeaders(w)
 		// write response
-		w.Write(encodedSuccessResponse)
+		writeSuccessResponse(w, encodedSuccessResponse)
 		return
 	}
 	errorIf(err.Trace(), "ListBuckets failed.", nil)
@@ -265,7 +265,7 @@ func (api CloudStorageAPI) PutBucketHandler(w http.ResponseWriter, req *http.Req
 	}
 	// Make sure to add Location information here only for bucket
 	w.Header().Set("Location", "/"+bucket)
-	writeSuccessResponse(w)
+	writeSuccessResponse(w, nil)
 }
 
 // PostPolicyBucketHandler - POST policy
@@ -348,7 +348,7 @@ func (api CloudStorageAPI) PostPolicyBucketHandler(w http.ResponseWriter, req *h
 		return
 	}
 	w.Header().Set("ETag", "\""+metadata.Md5+"\"")
-	writeSuccessResponse(w)
+	writeSuccessResponse(w, nil)
 }
 
 // PutBucketACLHandler - PUT Bucket ACL
@@ -384,7 +384,7 @@ func (api CloudStorageAPI) PutBucketACLHandler(w http.ResponseWriter, req *http.
 		}
 		return
 	}
-	writeSuccessResponse(w)
+	writeSuccessResponse(w, nil)
 }
 
 // GetBucketACLHandler - GET ACL on a Bucket
@@ -417,13 +417,13 @@ func (api CloudStorageAPI) GetBucketACLHandler(w http.ResponseWriter, req *http.
 		}
 		return
 	}
-	// generate response
+	// Generate response
 	response := generateAccessControlPolicyResponse(bucketMetadata.ACL)
 	encodedSuccessResponse := encodeSuccessResponse(response)
-	// write headers
+	// Write headers
-	setCommonHeaders(w, len(encodedSuccessResponse))
+	setCommonHeaders(w)
-	// write body
+	// Write success response.
-	w.Write(encodedSuccessResponse)
+	writeSuccessResponse(w, encodedSuccessResponse)
 }
 
 // HeadBucketHandler - HEAD Bucket
@@ -458,7 +458,7 @@ func (api CloudStorageAPI) HeadBucketHandler(w http.ResponseWriter, req *http.Re
 		}
 		return
 	}
-	writeSuccessResponse(w)
+	writeSuccessResponse(w, nil)
 }
 
 // DeleteBucketHandler - Delete bucket

object-handlers.go

@@ -194,7 +194,7 @@ func (api CloudStorageAPI) PutObjectHandler(w http.ResponseWriter, req *http.Req
 		return
 	}
 	w.Header().Set("ETag", "\""+metadata.Md5+"\"")
-	writeSuccessResponse(w)
+	writeSuccessResponse(w, nil)
 }
 
 /// Multipart CloudStorageAPI
@@ -237,9 +237,9 @@ func (api CloudStorageAPI) NewMultipartUploadHandler(w http.ResponseWriter, req
 	response := generateInitiateMultipartUploadResponse(bucket, object, uploadID)
 	encodedSuccessResponse := encodeSuccessResponse(response)
 	// write headers
-	setCommonHeaders(w, len(encodedSuccessResponse))
+	setCommonHeaders(w)
-	// write body
+	// write success response.
-	w.Write(encodedSuccessResponse)
+	writeSuccessResponse(w, encodedSuccessResponse)
 }
 
 // PutObjectPartHandler - Upload part
@@ -326,7 +326,7 @@ func (api CloudStorageAPI) PutObjectPartHandler(w http.ResponseWriter, req *http
 		return
 	}
 	w.Header().Set("ETag", "\""+calculatedMD5+"\"")
-	writeSuccessResponse(w)
+	writeSuccessResponse(w, nil)
 }
 
 // AbortMultipartUploadHandler - Abort multipart upload
@@ -412,10 +412,10 @@ func (api CloudStorageAPI) ListObjectPartsHandler(w http.ResponseWriter, req *ht
 	}
 	response := generateListPartsResponse(objectResourcesMetadata)
 	encodedSuccessResponse := encodeSuccessResponse(response)
-	// write headers
+	// write headers.
-	setCommonHeaders(w, len(encodedSuccessResponse))
+	setCommonHeaders(w)
-	// write body
+	// write success response.
-	w.Write(encodedSuccessResponse)
+	writeSuccessResponse(w, encodedSuccessResponse)
 }
 
 // CompleteMultipartUploadHandler - Complete multipart upload
@@ -478,9 +478,9 @@ func (api CloudStorageAPI) CompleteMultipartUploadHandler(w http.ResponseWriter,
 	response := generateCompleteMultpartUploadResponse(bucket, object, req.URL.String(), metadata.Md5)
 	encodedSuccessResponse := encodeSuccessResponse(response)
 	// write headers
-	setCommonHeaders(w, len(encodedSuccessResponse))
+	setCommonHeaders(w)
-	// write body
+	// write success response.
-	w.Write(encodedSuccessResponse)
+	writeSuccessResponse(w, encodedSuccessResponse)
 }
 
 /// Delete CloudStorageAPI