diff --git a/cmd/gateway-azure_test.go b/cmd/gateway-azure_test.go
index 3810cab48..33973a19a 100644
--- a/cmd/gateway-azure_test.go
+++ b/cmd/gateway-azure_test.go
@@ -17,6 +17,7 @@
 package cmd
 
 import (
+	"fmt"
 	"net/http"
 	"net/url"
 	"reflect"
@@ -31,6 +32,10 @@ func TestS3MetaToAzureProperties(t *testing.T) {
 	headers := map[string]string{
 		"accept-encoding":          "gzip",
 		"content-encoding":         "gzip",
+		"cache-control":            "age: 3600",
+		"content-disposition":      "dummy",
+		"content-length":           "10",
+		"content-type":             "application/javascript",
 		"X-Amz-Meta-Hdr":           "value",
 		"X-Amz-Meta-X_test_key":    "value",
 		"X-Amz-Meta-X__test__key":  "value",
@@ -101,8 +106,21 @@ func TestAzurePropertiesToS3Meta(t *testing.T) {
 		"X-Amz-Meta-X-Amz-Key":     "hu3ZSqtqwn+aL4V2VhAeov4i+bG3KyCtRMSXQFRHXOk=",
 		"X-Amz-Meta-X-Amz-Matdesc": "{}",
 		"X-Amz-Meta-X-Amz-Iv":      "eWmyryl8kq+EVnnsE7jpOg==",
+		"Cache-Control":            "max-age: 3600",
+		"Content-Disposition":      "dummy",
+		"Content-Encoding":         "gzip",
+		"Content-Length":           "10",
+		"Content-MD5":              "base64-md5",
+		"Content-Type":             "application/javascript",
 	}
-	actualMeta := azurePropertiesToS3Meta(metadata, storage.BlobProperties{})
+	actualMeta := azurePropertiesToS3Meta(metadata, storage.BlobProperties{
+		CacheControl:       "max-age: 3600",
+		ContentDisposition: "dummy",
+		ContentEncoding:    "gzip",
+		ContentLength:      10,
+		ContentMD5:         "base64-md5",
+		ContentType:        "application/javascript",
+	})
 	if !reflect.DeepEqual(actualMeta, expectedMeta) {
 		t.Fatalf("Test failed, expected %#v, got %#v", expectedMeta, actualMeta)
 	}
@@ -119,10 +137,15 @@ func TestAzureToObjectError(t *testing.T) {
 			nil, nil, "", "",
 		},
 		{
-			errors.Trace(errUnexpected), errUnexpected, "", "",
+			errors.Trace(fmt.Errorf("Non azure error")),
+			fmt.Errorf("Non azure error"), "", "",
 		},
 		{
-			errors.Trace(errUnexpected), errors.Trace(errUnexpected), "", "",
+			storage.AzureStorageServiceError{
+				Code: "ContainerAlreadyExists",
+			}, storage.AzureStorageServiceError{
+				Code: "ContainerAlreadyExists",
+			}, "bucket", "",
 		},
 		{
 			errors.Trace(storage.AzureStorageServiceError{
@@ -134,6 +157,16 @@ func TestAzureToObjectError(t *testing.T) {
 				Code: "InvalidResourceName",
 			}), BucketNameInvalid{Bucket: "bucket."}, "bucket.", "",
 		},
+		{
+			errors.Trace(storage.AzureStorageServiceError{
+				Code: "RequestBodyTooLarge",
+			}), PartTooBig{}, "", "",
+		},
+		{
+			errors.Trace(storage.AzureStorageServiceError{
+				Code: "InvalidMetadata",
+			}), UnsupportedMetadata{}, "", "",
+		},
 		{
 			errors.Trace(storage.AzureStorageServiceError{
 				StatusCode: http.StatusNotFound,
@@ -154,8 +187,7 @@ func TestAzureToObjectError(t *testing.T) {
 		},
 	}
 	for i, testCase := range testCases {
-		err := azureToObjectError(testCase.actualErr, testCase.bucket, testCase.object)
-		if err != nil {
+		if err := azureToObjectError(testCase.actualErr, testCase.bucket, testCase.object); err != nil {
 			if err.Error() != testCase.expectedErr.Error() {
 				t.Errorf("Test %d: Expected error %s, got %s", i+1, testCase.expectedErr, err)
 			}
@@ -191,33 +223,42 @@ func TestAzureParseBlockID(t *testing.T) {
 		subPartNumber int
 		uploadID      string
 		md5           string
+		success       bool
 	}{
-		{"MDAwMDEuMDcuZjMyOGMzNWNhZDkzODEzNy5kNDFkOGNkOThmMDBiMjA0ZTk4MDA5OThlY2Y4NDI3ZQ==", 1, 7, "f328c35cad938137", "d41d8cd98f00b204e9800998ecf8427e"},
-		{"MDAwMDIuMTkuYWJjZGMzNWNhZDkzODEzNy5hN2ZiNmI3YjM2ZWU0ZWQ2NmI1NTQ2ZmFjNDY5MDI3Mw==", 2, 19, "abcdc35cad938137", "a7fb6b7b36ee4ed66b5546fac4690273"},
+		// Invalid base64.
+		{"MDAwMDEuMDcuZjMyOGMzNWNhZDkzODEzNy5kNDFkOGNkOThmMDBiMjA0ZTk4MDA5OThlY2Y4NDI3ZQ=", 0, 0, "", "", false},
+		// Invalid number of tokens.
+		{"MDAwMDEuQUEuZjMyOGMzNWNhZDkzODEzNwo=", 0, 0, "", "", false},
+		// Invalid encoded part ID.
+		{"MDAwMGEuMDcuZjMyOGMzNWNhZDkzODEzNy5kNDFkOGNkOThmMDBiMjA0ZTk4MDA5OThlY2Y4NDI3ZQo=", 0, 0, "", "", false},
+		// Invalid sub part ID.
+		{"MDAwMDEuQUEuZjMyOGMzNWNhZDkzODEzNy5kNDFkOGNkOThmMDBiMjA0ZTk4MDA5OThlY2Y4NDI3ZQo=", 0, 0, "", "", false},
+		{"MDAwMDEuMDcuZjMyOGMzNWNhZDkzODEzNy5kNDFkOGNkOThmMDBiMjA0ZTk4MDA5OThlY2Y4NDI3ZQ==", 1, 7, "f328c35cad938137", "d41d8cd98f00b204e9800998ecf8427e", true},
+		{"MDAwMDIuMTkuYWJjZGMzNWNhZDkzODEzNy5hN2ZiNmI3YjM2ZWU0ZWQ2NmI1NTQ2ZmFjNDY5MDI3Mw==", 2, 19, "abcdc35cad938137", "a7fb6b7b36ee4ed66b5546fac4690273", true},
 	}
-	for _, test := range testCases {
+	for i, test := range testCases {
 		partID, subPartNumber, uploadID, md5, err := azureParseBlockID(test.blockID)
-		if err != nil {
-			t.Fatal(err)
+		if err != nil && test.success {
+			t.Errorf("Test %d: Expected success but failed %s", i+1, err)
 		}
-		if partID != test.partID {
-			t.Fatalf("%d not equal to %d", partID, test.partID)
+		if err == nil && !test.success {
+			t.Errorf("Test %d: Expected to fail but succeeeded insteadl", i+1)
 		}
-		if subPartNumber != test.subPartNumber {
-			t.Fatalf("%d not equal to %d", subPartNumber, test.subPartNumber)
-		}
-		if uploadID != test.uploadID {
-			t.Fatalf("%s not equal to %s", uploadID, test.uploadID)
-		}
-		if md5 != test.md5 {
-			t.Fatalf("%s not equal to %s", md5, test.md5)
+		if err == nil {
+			if partID != test.partID {
+				t.Errorf("Test %d: %d not equal to %d", i+1, partID, test.partID)
+			}
+			if subPartNumber != test.subPartNumber {
+				t.Errorf("Test %d: %d not equal to %d", i+1, subPartNumber, test.subPartNumber)
+			}
+			if uploadID != test.uploadID {
+				t.Errorf("Test %d: %s not equal to %s", i+1, uploadID, test.uploadID)
+			}
+			if md5 != test.md5 {
+				t.Errorf("Test %d: %s not equal to %s", i+1, md5, test.md5)
+			}
 		}
 	}
-
-	_, _, _, _, err := azureParseBlockID("junk")
-	if err == nil {
-		t.Fatal("Expected azureParseBlockID() to return error")
-	}
 }
 
 // Test azureListBlobsGetParameters()
diff --git a/cmd/gateway-b2_test.go b/cmd/gateway-b2_test.go
index bdfaa4b5a..2a50aaba4 100644
--- a/cmd/gateway-b2_test.go
+++ b/cmd/gateway-b2_test.go
@@ -17,8 +17,12 @@
 package cmd
 
 import (
+	"fmt"
 	"net/http"
 	"testing"
+
+	b2 "github.com/minio/blazer/base"
+	"github.com/minio/minio/pkg/errors"
 )
 
 // Tests headerToObjectInfo
@@ -102,3 +106,90 @@ func TestMkRange(t *testing.T) {
 		}
 	}
 }
+
+// Test b2 object error.
+func TestB2ObjectError(t *testing.T) {
+	testCases := []struct {
+		params      []string
+		b2Err       error
+		expectedErr error
+	}{
+		{
+			[]string{}, nil, nil,
+		},
+		{
+			[]string{}, fmt.Errorf("Not *Error"), fmt.Errorf("Not *Error"),
+		},
+		{
+			[]string{}, errors.Trace(fmt.Errorf("Non B2 Error")), fmt.Errorf("Non B2 Error"),
+		},
+		{
+			[]string{"bucket"}, errors.Trace(b2.Error{
+				StatusCode: 1,
+				Code:       "duplicate_bucket_name",
+			}), BucketAlreadyOwnedByYou{Bucket: "bucket"},
+		},
+		{
+			[]string{"bucket"}, errors.Trace(b2.Error{
+				StatusCode: 1,
+				Code:       "bad_request",
+			}), BucketNotFound{Bucket: "bucket"},
+		},
+		{
+			[]string{"bucket", "object"}, errors.Trace(b2.Error{
+				StatusCode: 1,
+				Code:       "bad_request",
+			}), ObjectNameInvalid{
+				Bucket: "bucket",
+				Object: "object",
+			},
+		},
+		{
+			[]string{"bucket"}, errors.Trace(b2.Error{
+				StatusCode: 1,
+				Code:       "bad_bucket_id",
+			}), BucketNotFound{Bucket: "bucket"},
+		},
+		{
+			[]string{"bucket", "object"}, errors.Trace(b2.Error{
+				StatusCode: 1,
+				Code:       "file_not_present",
+			}), ObjectNotFound{
+				Bucket: "bucket",
+				Object: "object",
+			},
+		},
+		{
+			[]string{"bucket", "object"}, errors.Trace(b2.Error{
+				StatusCode: 1,
+				Code:       "not_found",
+			}), ObjectNotFound{
+				Bucket: "bucket",
+				Object: "object",
+			},
+		},
+		{
+			[]string{"bucket"}, errors.Trace(b2.Error{
+				StatusCode: 1,
+				Code:       "cannot_delete_non_empty_bucket",
+			}), BucketNotEmpty{Bucket: "bucket"},
+		},
+		{
+			[]string{"bucket", "object", "uploadID"}, errors.Trace(b2.Error{
+				StatusCode: 1,
+				Message:    "No active upload for",
+			}), InvalidUploadID{
+				UploadID: "uploadID",
+			},
+		},
+	}
+
+	for i, testCase := range testCases {
+		actualErr := b2ToObjectError(testCase.b2Err, testCase.params...)
+		if actualErr != nil {
+			if actualErr.Error() != testCase.expectedErr.Error() {
+				t.Errorf("Test %d: Expected %s, got %s", i+1, testCase.expectedErr, actualErr)
+			}
+		}
+	}
+}
diff --git a/cmd/gateway-gcs_test.go b/cmd/gateway-gcs_test.go
index 84bceb11a..f31994d94 100644
--- a/cmd/gateway-gcs_test.go
+++ b/cmd/gateway-gcs_test.go
@@ -1,5 +1,5 @@
 /*
- * Minio Cloud Storage, (C) 2016 Minio, Inc.
+ * Minio Cloud Storage, (C) 2017 Minio, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -23,7 +23,9 @@ import (
 	"reflect"
 	"testing"
 
-	minio "github.com/minio/minio-go"
+	"github.com/minio/minio-go"
+	"github.com/minio/minio/pkg/errors"
+	"google.golang.org/api/googleapi"
 )
 
 func TestToGCSPageToken(t *testing.T) {
@@ -201,10 +203,192 @@ func TestGCSParseProjectID(t *testing.T) {
 	f.WriteString(contents)
 	projectID, err := gcsParseProjectID(f.Name())
 	if err != nil {
-		t.Error(err)
-		return
+		t.Fatal(err)
 	}
 	if projectID != "miniotesting" {
 		t.Errorf(`Expected projectID value to be "miniotesting"`)
 	}
+
+	if _, err = gcsParseProjectID("non-existent"); err == nil {
+		t.Errorf(`Expected to fail but succeeded reading "non-existent"`)
+	}
+
+	f.WriteString(`,}`)
+
+	if _, err := gcsParseProjectID(f.Name()); err == nil {
+		t.Errorf(`Expected to fail reading corrupted credentials file`)
+	}
+}
+
+func TestGCSPublicURL(t *testing.T) {
+	gcsURL := toGCSPublicURL("bucket", "testing")
+	if gcsURL != "https://storage.googleapis.com/bucket/testing" {
+		t.Errorf(`Expected "https://storage.googleapis.com/bucket/testing", got %s"`, gcsURL)
+	}
+}
+
+func TestGCSToObjectError(t *testing.T) {
+	testCases := []struct {
+		params      []string
+		gcsErr      error
+		expectedErr error
+	}{
+		{
+			[]string{}, nil, nil,
+		},
+		{
+			[]string{}, fmt.Errorf("Not *Error"), fmt.Errorf("Not *Error"),
+		},
+		{
+			[]string{"bucket"},
+			errors.Trace(fmt.Errorf("storage: bucket doesn't exist")),
+			BucketNotFound{
+				Bucket: "bucket",
+			},
+		},
+		{
+			[]string{"bucket", "object"},
+			errors.Trace(fmt.Errorf("storage: object doesn't exist")),
+			ObjectNotFound{
+				Bucket: "bucket",
+				Object: "object",
+			},
+		},
+		{
+			[]string{"bucket", "object", "uploadID"},
+			errors.Trace(fmt.Errorf("storage: object doesn't exist")),
+			InvalidUploadID{
+				UploadID: "uploadID",
+			},
+		},
+		{
+			[]string{},
+			errors.Trace(fmt.Errorf("Unknown error")),
+			fmt.Errorf("Unknown error"),
+		},
+		{
+			[]string{"bucket", "object"},
+			errors.Trace(&googleapi.Error{
+				Message: "No list of errors",
+			}),
+			&googleapi.Error{
+				Message: "No list of errors",
+			},
+		},
+		{
+			[]string{"bucket", "object"},
+			errors.Trace(&googleapi.Error{
+				Errors: []googleapi.ErrorItem{{
+					Reason:  "conflict",
+					Message: "You already own this bucket. Please select another name.",
+				}},
+			}),
+			BucketAlreadyOwnedByYou{Bucket: "bucket"},
+		},
+		{
+			[]string{"bucket", "object"},
+			errors.Trace(&googleapi.Error{
+				Errors: []googleapi.ErrorItem{{
+					Reason:  "conflict",
+					Message: "Sorry, that name is not available. Please try a different one.",
+				}},
+			}),
+			BucketAlreadyExists{Bucket: "bucket"},
+		},
+		{
+			[]string{"bucket", "object"},
+			errors.Trace(&googleapi.Error{
+				Errors: []googleapi.ErrorItem{{
+					Reason: "conflict",
+				}},
+			}),
+			BucketNotEmpty{Bucket: "bucket"},
+		},
+		{
+			[]string{"bucket"},
+			errors.Trace(&googleapi.Error{
+				Errors: []googleapi.ErrorItem{{
+					Reason: "notFound",
+				}},
+			}),
+			BucketNotFound{Bucket: "bucket"},
+		},
+		{
+			[]string{"bucket", "object"},
+			errors.Trace(&googleapi.Error{
+				Errors: []googleapi.ErrorItem{{
+					Reason: "notFound",
+				}},
+			}),
+			ObjectNotFound{
+				Bucket: "bucket",
+				Object: "object",
+			},
+		},
+		{
+			[]string{"bucket"},
+			errors.Trace(&googleapi.Error{
+				Errors: []googleapi.ErrorItem{{
+					Reason: "invalid",
+				}},
+			}),
+			BucketNameInvalid{
+				Bucket: "bucket",
+			},
+		},
+		{
+			[]string{"bucket", "object"},
+			errors.Trace(&googleapi.Error{
+				Errors: []googleapi.ErrorItem{{
+					Reason: "forbidden",
+				}},
+			}),
+			PrefixAccessDenied{
+				Bucket: "bucket",
+				Object: "object",
+			},
+		},
+		{
+			[]string{"bucket", "object"},
+			errors.Trace(&googleapi.Error{
+				Errors: []googleapi.ErrorItem{{
+					Reason: "keyInvalid",
+				}},
+			}),
+			PrefixAccessDenied{
+				Bucket: "bucket",
+				Object: "object",
+			},
+		},
+		{
+			[]string{"bucket", "object"},
+			errors.Trace(&googleapi.Error{
+				Errors: []googleapi.ErrorItem{{
+					Reason: "required",
+				}},
+			}),
+			PrefixAccessDenied{
+				Bucket: "bucket",
+				Object: "object",
+			},
+		},
+		{
+			[]string{"bucket", "object"},
+			errors.Trace(&googleapi.Error{
+				Errors: []googleapi.ErrorItem{{
+					Reason: "unknown",
+				}},
+			}),
+			fmt.Errorf("Unsupported error reason: unknown"),
+		},
+	}
+
+	for i, testCase := range testCases {
+		actualErr := gcsToObjectError(testCase.gcsErr, testCase.params...)
+		if actualErr != nil {
+			if actualErr.Error() != testCase.expectedErr.Error() {
+				t.Errorf("Test %d: Expected %s, got %s", i+1, testCase.expectedErr, actualErr)
+			}
+		}
+	}
 }
diff --git a/vendor/github.com/minio/blazer/base/base.go b/vendor/github.com/minio/blazer/base/base.go
index cc20aba1b..738106379 100644
--- a/vendor/github.com/minio/blazer/base/base.go
+++ b/vendor/github.com/minio/blazer/base/base.go
@@ -46,47 +46,47 @@ const (
 	DefaultUserAgent = "blazer/0.1.1"
 )
 
-type b2err struct {
-	msg        string
-	method     string
+type Error struct {
+	Message    string
+	Method     string
+	StatusCode int
+	Code       string
 	retry      int
-	statusCode int
-	code       string
 }
 
-func (e b2err) Error() string {
-	if e.method == "" {
-		return fmt.Sprintf("b2 error: %s", e.msg)
+func (e Error) Error() string {
+	if e.Method == "" {
+		return fmt.Sprintf("b2 error: %s", e.Message)
 	}
-	return fmt.Sprintf("%s: %d: %s: %s", e.method, e.statusCode, e.code, e.msg)
+	return fmt.Sprintf("%s: %d: %s: %s", e.Method, e.StatusCode, e.Code, e.Message)
 }
 
 // Action checks an error and returns a recommended course of action.
 func Action(err error) ErrAction {
-	e, ok := err.(b2err)
+	e, ok := err.(Error)
 	if !ok {
 		return Punt
 	}
 	if e.retry > 0 {
 		return Retry
 	}
-	if e.statusCode >= http.StatusInternalServerError && e.statusCode < 600 {
-		if e.method == "b2_upload_file" || e.method == "b2_upload_part" {
+	if e.StatusCode >= http.StatusInternalServerError && e.StatusCode < 600 {
+		if e.Method == "b2_upload_file" || e.Method == "b2_upload_part" {
 			return AttemptNewUpload
 		}
 	}
-	switch e.statusCode {
+	switch e.StatusCode {
 	case http.StatusUnauthorized:
-		if e.method == "b2_authorize_account" {
+		if e.Method == "b2_authorize_account" {
 			return Punt
 		}
-		if e.method == "b2_upload_file" || e.method == "b2_upload_part" {
+		if e.Method == "b2_upload_file" || e.Method == "b2_upload_part" {
 			return AttemptNewUpload
 		}
 		return ReAuthenticate
 	case http.StatusBadRequest:
 		// See restic/restic#1207
-		if e.method == "b2_upload_file" && strings.HasPrefix(e.msg, "more than one upload using auth token") {
+		if e.Method == "b2_upload_file" && strings.HasPrefix(e.Message, "more than one upload using auth token") {
 			return AttemptNewUpload
 		}
 		return Punt
@@ -104,11 +104,11 @@ type ErrAction int
 
 // Code returns the error code and message.
 func Code(err error) (int, string, string) {
-	e, ok := err.(b2err)
+	e, ok := err.(Error)
 	if !ok {
 		return 0, "", ""
 	}
-	return e.statusCode, e.code, e.msg
+	return e.StatusCode, e.Code, e.Message
 }
 
 const (
@@ -149,12 +149,12 @@ func mkErr(resp *http.Response) error {
 		}
 		retryAfter = int(r)
 	}
-	return b2err{
-		msg:        msg.Msg,
+	return Error{
+		Message:    msg.Msg,
+		StatusCode: resp.StatusCode,
+		Code:       msg.Code,
+		Method:     resp.Request.Header.Get("X-Blazer-Method"),
 		retry:      retryAfter,
-		statusCode: resp.StatusCode,
-		code:       msg.Code,
-		method:     resp.Request.Header.Get("X-Blazer-Method"),
 	}
 }
 
@@ -163,7 +163,7 @@ func mkErr(resp *http.Response) error {
 // indicates Retry, the user should implement their own exponential backoff,
 // beginning with one second.
 func Backoff(err error) time.Duration {
-	e, ok := err.(b2err)
+	e, ok := err.(Error)
 	if !ok {
 		return 0
 	}
@@ -379,9 +379,9 @@ func (o *b2Options) makeRequest(ctx context.Context, method, verb, uri string, b
 	if reply.err != nil {
 		// Connection errors are retryable.
 		blog.V(2).Infof(">> %s uri: %v err: %v", method, req.URL, reply.err)
-		return b2err{
-			msg:   reply.err.Error(),
-			retry: 1,
+		return Error{
+			Message: reply.err.Error(),
+			retry:   1,
 		}
 	}
 	resp := reply.resp
diff --git a/vendor/vendor.json b/vendor/vendor.json
index c23f3f6e2..905b7c9f3 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -296,10 +296,10 @@
 			"revisionTime": "2016-11-23T14:36:37Z"
 		},
 		{
-			"checksumSHA1": "1EiU/fWJI6ldCTGorUvijilegRM=",
+			"checksumSHA1": "uTShVxdYNwW+3WI6SfJwOc/LQgo=",
 			"path": "github.com/minio/blazer/base",
-			"revision": "8e81ddf2d8deed54c6ac3f7d264d78659e72fbb8",
-			"revisionTime": "2017-10-06T21:06:28Z"
+			"revision": "2081f5bf046503f576d8712253724fbf2950fffe",
+			"revisionTime": "2017-11-26T20:28:54Z"
 		},
 		{
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