lib/http: realign struct for better size allocation

The realignment reduce the cost of the following struct,

* EndpointResponse: from 72 to 56 bytes (-16 bytes)
* RangePosition: from 48 to 24 bytes (-24 bytes)
* testCase in TestParseContentRange: from 24 to 16 bytes (-8 bytes)

5 files changed, 14 insertions, 13 deletions

diff --git a/lib/http/endpoint_response.go b/lib/http/endpoint_response.go
index ff16d6b9..6bf115d8 100644
--- a/lib/http/endpoint_response.go
+++ b/lib/http/endpoint_response.go
@@ -17,9 +17,10 @@ import liberrors "github.com/shuLhan/share/lib/errors"
 //
 // See the example below on how to use it with Endpoint.Call handler.
 type EndpointResponse struct {
-	liberrors.E
 	Data interface{} `json:"data,omitempty"`
 
+	liberrors.E
+
 	// The Limit field contains the maximum number of records per page.
 	Limit int64 `json:"limit,omitempty"`
 
diff --git a/lib/http/endpoint_response_example_test.go b/lib/http/endpoint_response_example_test.go
index 91829346..de34a11e 100644
--- a/lib/http/endpoint_response_example_test.go
+++ b/lib/http/endpoint_response_example_test.go
@@ -98,7 +98,7 @@ func ExampleEndpointResponse() {
 	fmt.Printf("GET /?id=1000 => %s\n", resBody)
 
 	// Output:
-	// GET / => {"code":400,"message":"empty parameter id"}
-	// GET /?id=0 => {"code":500,"message":"id value 0 cause internal server error"}
-	// GET /?id=1000 => {"code":200,"data":{"ID":"1000"}}
+	// GET / => {"message":"empty parameter id","code":400}
+	// GET /?id=0 => {"message":"id value 0 cause internal server error","code":500}
+	// GET /?id=1000 => {"data":{"ID":"1000"},"code":200}
 }
diff --git a/lib/http/range_position.go b/lib/http/range_position.go
index eaac5f91..279cdcb2 100644
--- a/lib/http/range_position.go
+++ b/lib/http/range_position.go
@@ -11,13 +11,13 @@ import (
 type RangePosition struct {
 	unit string
 
+	content []byte
+
 	Start int64
 	End   int64
 
 	// Length of zero means read until the end.
 	Length int64
-
-	content []byte
 }
 
 // ParseContentRange parse Content-Range value, the following format,
diff --git a/lib/http/range_position_test.go b/lib/http/range_position_test.go
index a6ca7ceb..1147b875 100644
--- a/lib/http/range_position_test.go
+++ b/lib/http/range_position_test.go
@@ -8,8 +8,8 @@ import (
 
 func TestParseContentRange(t *testing.T) {
 	type testCase struct {
-		v   string
 		exp *RangePosition
+		v   string
 	}
 
 	var cases = []testCase{{
diff --git a/lib/http/server_test.go b/lib/http/server_test.go
index bea01131..fd7330d6 100644
--- a/lib/http/server_test.go
+++ b/lib/http/server_test.go
@@ -757,32 +757,32 @@ func TestStatusError(t *testing.T) {
 		desc:          "With registered error no body",
 		reqURL:        testServerUrl + "/error/no-body?k=v",
 		expStatusCode: http.StatusLengthRequired,
-		expBody:       `{"code":411,"message":"Length required"}`,
+		expBody:       `{"message":"Length required","code":411}`,
 	}, {
 		desc:          "With registered error binary",
 		reqURL:        testServerUrl + "/error/binary?k=v",
 		expStatusCode: http.StatusLengthRequired,
-		expBody:       `{"code":411,"message":"Length required"}`,
+		expBody:       `{"message":"Length required","code":411}`,
 	}, {
 		desc:          "With registered error plain",
 		reqURL:        testServerUrl + "/error/plain?k=v",
 		expStatusCode: http.StatusLengthRequired,
-		expBody:       `{"code":411,"message":"Length required"}`,
+		expBody:       `{"message":"Length required","code":411}`,
 	}, {
 		desc:          "With registered error plain",
 		reqURL:        testServerUrl + "/error/json?k=v",
 		expStatusCode: http.StatusLengthRequired,
-		expBody:       `{"code":411,"message":"Length required"}`,
+		expBody:       `{"message":"Length required","code":411}`,
 	}, {
 		desc:          "With registered error plain",
 		reqURL:        testServerUrl + "/error/no-code?k=v",
 		expStatusCode: http.StatusInternalServerError,
-		expBody:       `{"code":500,"message":"internal server error","name":"ERR_INTERNAL"}`,
+		expBody:       `{"message":"internal server error","name":"ERR_INTERNAL","code":500}`,
 	}, {
 		desc:          "With registered error plain",
 		reqURL:        testServerUrl + "/error/custom?k=v",
 		expStatusCode: http.StatusInternalServerError,
-		expBody:       `{"code":500,"message":"internal server error","name":"ERR_INTERNAL"}`,
+		expBody:       `{"message":"internal server error","name":"ERR_INTERNAL","code":500}`,
 	}}
 
 	for _, c := range cases {