diff --git a/pkg/donut/donut-v2.go b/pkg/donut/donut-v2.go
index 582cee7de..a7fb83f43 100644
--- a/pkg/donut/donut-v2.go
+++ b/pkg/donut/donut-v2.go
@@ -25,6 +25,7 @@ import (
 	"io"
 	"io/ioutil"
 	"log"
+	"net/http"
 	"runtime/debug"
 	"sort"
 	"strconv"
@@ -54,9 +55,10 @@ type Config struct {
 // API - local variables
 type API struct {
 	config           *Config
+	req              *http.Request
 	lock             *sync.Mutex
 	objects          *data.Cache
-	multiPartObjects *data.Cache
+	multiPartObjects map[string]*data.Cache
 	storedBuckets    *metadata.Cache
 	nodes            map[string]node
 	buckets          map[string]bucket
@@ -91,9 +93,8 @@ func New() (Interface, error) {
 	a.nodes = make(map[string]node)
 	a.buckets = make(map[string]bucket)
 	a.objects = data.NewCache(a.config.MaxSize)
-	a.multiPartObjects = data.NewCache(0)
+	a.multiPartObjects = make(map[string]*data.Cache)
 	a.objects.OnEvicted = a.evictedObject
-	a.multiPartObjects.OnEvicted = a.evictedPart
 	a.lock = new(sync.Mutex)
 
 	if len(a.config.NodeDiskMap) > 0 {
@@ -113,16 +114,21 @@ func New() (Interface, error) {
 		}
 		for k, v := range buckets {
 			var newBucket = storedBucket{}
+			newBucket.bucketMetadata = v
 			newBucket.objectMetadata = make(map[string]ObjectMetadata)
 			newBucket.multiPartSession = make(map[string]MultiPartSession)
 			newBucket.partMetadata = make(map[int]PartMetadata)
-			newBucket.bucketMetadata = v
 			a.storedBuckets.Set(k, newBucket)
 		}
 	}
 	return a, nil
 }
 
+// SetRequest API for setting request header
+func (donut API) SetRequest(req *http.Request) {
+	donut.req = req
+}
+
 // GetObject - GET object from cache buffer
 func (donut API) GetObject(w io.Writer, bucket string, object string) (int64, error) {
 	donut.lock.Lock()
@@ -344,7 +350,16 @@ func (donut API) createObject(bucket, key, contentType, expectedMD5Sum string, s
 	}
 
 	if len(donut.config.NodeDiskMap) > 0 {
-		objMetadata, err := donut.putObject(bucket, key, expectedMD5Sum, data, map[string]string{"contentType": contentType})
+		objMetadata, err := donut.putObject(
+			bucket,
+			key,
+			expectedMD5Sum,
+			data,
+			map[string]string{
+				"contentType":   contentType,
+				"contentLength": strconv.FormatInt(size, 10),
+			},
+		)
 		if err != nil {
 			return ObjectMetadata{}, iodine.New(err, nil)
 		}
@@ -356,7 +371,7 @@ func (donut API) createObject(bucket, key, contentType, expectedMD5Sum string, s
 	hash := md5.New()
 
 	var err error
-	var totalLength int
+	var totalLength int64
 	for err == nil {
 		var length int
 		byteBuffer := make([]byte, 1024*1024)
@@ -371,13 +386,17 @@ func (donut API) createObject(bucket, key, contentType, expectedMD5Sum string, s
 		if !ok {
 			return ObjectMetadata{}, iodine.New(InternalError{}, nil)
 		}
-		totalLength += length
+		totalLength += int64(length)
 		go debug.FreeOSMemory()
 	}
+	if totalLength != size {
+		// Delete perhaps the object is already saved, due to the nature of append()
+		donut.objects.Delete(objectKey)
+		return ObjectMetadata{}, iodine.New(IncompleteBody{Bucket: bucket, Object: key}, nil)
+	}
 	if err != io.EOF {
 		return ObjectMetadata{}, iodine.New(err, nil)
 	}
-
 	md5SumBytes := hash.Sum(nil)
 	md5Sum := hex.EncodeToString(md5SumBytes)
 	// Verify if the written object is equal to what is expected, only if it is requested as such
diff --git a/pkg/donut/errors.go b/pkg/donut/errors.go
index 692d85cb7..ea909235d 100644
--- a/pkg/donut/errors.go
+++ b/pkg/donut/errors.go
@@ -269,6 +269,14 @@ func (e EntityTooLarge) Error() string {
 	return e.Bucket + "#" + e.Object + "with " + e.Size + "reached maximum allowed size limit " + e.MaxSize
 }
 
+// IncompleteBody You did not provide the number of bytes specified by the Content-Length HTTP header
+type IncompleteBody GenericObjectError
+
+// Return string an error formatted as the given text
+func (e IncompleteBody) Error() string {
+	return e.Bucket + "#" + e.Object + "has incomplete body"
+}
+
 // Return string an error formatted as the given text
 func (e BackendCorrupted) Error() string {
 	return "Backend corrupted: " + e.Path
diff --git a/pkg/donut/multipart.go b/pkg/donut/multipart.go
index 78269ef03..8a9dbd176 100644
--- a/pkg/donut/multipart.go
+++ b/pkg/donut/multipart.go
@@ -31,6 +31,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/minio/minio/pkg/donut/cache/data"
 	"github.com/minio/minio/pkg/iodine"
 )
 
@@ -62,6 +63,9 @@ func (donut API) NewMultipartUpload(bucket, key, contentType string) (string, er
 		initiated:  time.Now(),
 		totalParts: 0,
 	}
+	multiPartCache := data.NewCache(0)
+	multiPartCache.OnEvicted = donut.evictedPart
+	donut.multiPartObjects[uploadID] = multiPartCache
 	donut.storedBuckets.Set(bucket, storedBucket)
 	return uploadID, nil
 }
@@ -134,11 +138,11 @@ func (donut API) createObjectPart(bucket, key, uploadID string, partID int, cont
 
 	// calculate md5
 	hash := md5.New()
-	var readBytes []byte
 
 	var err error
-	var length int
+	var totalLength int64
 	for err == nil {
+		var length int
 		byteBuffer := make([]byte, 1024*1024)
 		length, err = data.Read(byteBuffer)
 		// While hash.Write() wouldn't mind a Nil byteBuffer
@@ -147,19 +151,22 @@ func (donut API) createObjectPart(bucket, key, uploadID string, partID int, cont
 			break
 		}
 		hash.Write(byteBuffer[0:length])
-		readBytes = append(readBytes, byteBuffer[0:length]...)
+		ok := donut.multiPartObjects[uploadID].Append(partID, byteBuffer[0:length])
+		if !ok {
+			return "", iodine.New(InternalError{}, nil)
+		}
+		totalLength += int64(length)
+		go debug.FreeOSMemory()
+	}
+	if totalLength != size {
+		donut.multiPartObjects[uploadID].Delete(partID)
+		return "", iodine.New(IncompleteBody{Bucket: bucket, Object: key}, nil)
 	}
 	if err != io.EOF {
 		return "", iodine.New(err, nil)
 	}
-	go debug.FreeOSMemory()
-	md5SumBytes := hash.Sum(nil)
-	totalLength := int64(len(readBytes))
-
-	donut.multiPartObjects.Set(partID, readBytes)
-	// setting up for de-allocation
-	readBytes = nil
 
+	md5SumBytes := hash.Sum(nil)
 	md5Sum := hex.EncodeToString(md5SumBytes)
 	// Verify if the written object is equal to what is expected, only if it is requested as such
 	if strings.TrimSpace(expectedMD5Sum) != "" {
@@ -186,7 +193,7 @@ func (donut API) createObjectPart(bucket, key, uploadID string, partID int, cont
 func (donut API) cleanupMultipartSession(bucket, key, uploadID string) {
 	storedBucket := donut.storedBuckets.Get(bucket).(storedBucket)
 	for i := 1; i <= storedBucket.multiPartSession[key].totalParts; i++ {
-		donut.multiPartObjects.Delete(i)
+		donut.multiPartObjects[uploadID].Delete(i)
 	}
 	delete(storedBucket.multiPartSession, key)
 	donut.storedBuckets.Set(bucket, storedBucket)
@@ -218,7 +225,7 @@ func (donut API) CompleteMultipartUpload(bucket, key, uploadID string, parts map
 	var fullObject bytes.Buffer
 	for i := 1; i <= len(parts); i++ {
 		recvMD5 := parts[i]
-		object, ok := donut.multiPartObjects.Get(i)
+		object, ok := donut.multiPartObjects[uploadID].Get(i)
 		if ok == false {
 			donut.lock.Unlock()
 			return ObjectMetadata{}, iodine.New(errors.New("missing part: "+strconv.Itoa(i)), nil)
diff --git a/pkg/donut/signature-v4.go b/pkg/donut/signature-v4.go
index 83d643fba..cfdd04cf0 100644
--- a/pkg/donut/signature-v4.go
+++ b/pkg/donut/signature-v4.go
@@ -124,7 +124,7 @@ func (r *request) getHashedPayload() string {
 		}
 	}
 	hashedPayload := hash()
-	r.calculatedReq.Header.Set("X-Amz-Content-Sha256", hashedPayload)
+	r.calculatedReq.Header.Set("x-amz-content-sha256", hashedPayload)
 	return hashedPayload
 }
 
@@ -241,8 +241,8 @@ func (r *request) getSignature(signingKey []byte, stringToSign string) string {
 func (r *request) SignV4() (string, error) {
 	// Add date if not present
 	var date string
-	if date = r.calculatedReq.Header.Get("Date"); date == "" {
-		if date = r.calculatedReq.Header.Get("X-Amz-Date"); date == "" {
+	if date = r.calculatedReq.Header.Get("x-amz-date"); date == "" {
+		if date = r.calculatedReq.Header.Get("Date"); date == "" {
 			return "", iodine.New(MissingDateHeader{}, nil)
 		}
 	}
diff --git a/pkg/server/api/object-handlers.go b/pkg/server/api/object-handlers.go
index 210fe0fcc..8299d7285 100644
--- a/pkg/server/api/object-handlers.go
+++ b/pkg/server/api/object-handlers.go
@@ -218,6 +218,8 @@ func (api Minio) PutObjectHandler(w http.ResponseWriter, req *http.Request) {
 		writeErrorResponse(w, req, MethodNotAllowed, acceptsContentType, req.URL.Path)
 	case donut.BadDigest:
 		writeErrorResponse(w, req, BadDigest, acceptsContentType, req.URL.Path)
+	case donut.IncompleteBody:
+		writeErrorResponse(w, req, IncompleteBody, acceptsContentType, req.URL.Path)
 	case donut.EntityTooLarge:
 		writeErrorResponse(w, req, EntityTooLarge, acceptsContentType, req.URL.Path)
 	case donut.InvalidDigest:
@@ -340,6 +342,8 @@ func (api Minio) PutObjectPartHandler(w http.ResponseWriter, req *http.Request)
 		writeErrorResponse(w, req, MethodNotAllowed, acceptsContentType, req.URL.Path)
 	case donut.BadDigest:
 		writeErrorResponse(w, req, BadDigest, acceptsContentType, req.URL.Path)
+	case donut.IncompleteBody:
+		writeErrorResponse(w, req, IncompleteBody, acceptsContentType, req.URL.Path)
 	case donut.EntityTooLarge:
 		writeErrorResponse(w, req, EntityTooLarge, acceptsContentType, req.URL.Path)
 	case donut.InvalidDigest: