Update README

README.md

@@ -17,21 +17,23 @@ $ ./nebula-httpd
 
 ## Required
 
-- Go 11+
+- Go 1.13+
 - [beego](https://beego.me/)
 
 ## User Guide
 
-#### API Definition
+### API Definition
+
 | Name       | Path               | Method |
 |------------|--------------------|--------|
 | connect    | /api/db/connect    | POST   |
 | exec       | /api/db/exec       | POST   |
 | disconnect | /api/db/disconnect | POST   |
 
-> Connect API
+#### Connect API ####
+
+The request json body
 
-The requested json body
 ```json
 {
   "username": "user",
@@ -40,6 +42,7 @@ The requested json body
   "port": 9669
 }
 ```
+
 The description of the parameters is as follows.
 
 | Field    | Description                                                                                                                 |
@@ -50,7 +53,15 @@ The description of the parameters is as follows.
 | port     | Sets the port number of the graphd service. The default port number is 9669.                                                |
 
 ```bash
-$ curl -i  -X POST -d '{"username":"user","password":"password","address":"192.168.8.26","port":9669}' http://127.0.0.1:8080/api/db/connect
+$ curl -i \
+    -X POST \
+    -d '{"username":"user","password":"password","address":"192.168.8.26","port":9669}' \
+    http://127.0.0.1:8080/api/db/connect
+```
+
+response:
+
+```
 HTTP/1.1 200 OK
 Content-Length: 100
 Content-Type: application/json; charset=utf-8
@@ -69,44 +80,63 @@ Date: Fri, 02 Apr 2021 08:49:18 GMT
 
 Notice:
 
-The response data nsid "5e18fa40-5343-422f-84e3-e7f9cad6b735" is encoded by HMAC-SH256 encryption algorithm，so it's not the same as what you get from a cookie.
+The response data nsid `5e18fa40-5343-422f-84e3-e7f9cad6b735` is encoded by HMAC-SH256 encryption algorithm, so it's not the same as what you get from a cookie.
 If you connect the graphd service succeed, remember to save the *NSID*, it's important for the *exec api* to execute nGQL.
 If you restart the gateway server, all authenticated session will be lost, please noticed.
 
-> Exec API
+#### Exec API ####
 
 The requested json body
+
 ```json
 {
-"gql": "show spaces;"
+  "gql": "show spaces;"
 }
 ```
+
 The request header is necessary to request exec api, cookies must be set to get results.
 
+
 ```bash
-$ curl -H "Cookie: SameSite=None; nsid=bec2e665ba62a13554b617d70de8b9b9" -H "nsid: bec2e665ba62a13554b617d70de8b9b9" -X POST -d '{"gql": "show spaces;"}' http://127.0.0.1:8080/api/db/exec
-  {
-    "code": 0,
-    "data": {
-      "headers": [
-        "Name"
-      ],
-      "tables": [
-        {
-          "Name": "nba"
-        }
-      ],
-      "timeCost": 4232
-    },
-    "message": ""
+$ curl -X POST \
+    -H "Cookie: SameSite=None; nsid=bec2e665ba62a13554b617d70de8b9b9" \
+    -H "nsid: bec2e665ba62a13554b617d70de8b9b9" \
+    -d '{"gql": "show spaces;"}' \
+    http://127.0.0.1:8080/api/db/exec
 ```
 
-> Disconnect API
+response:
+
+```json
+{
+  "code": 0,
+  "data": {
+    "headers": [
+      "Name"
+    ],
+    "tables": [
+      {
+        "Name": "nba"
+      }
+    ],
+    "timeCost": 4232
+  },
+  "message": ""
+}
+```
+
+#### Disconnect API ####
 
 ```bash
 $ curl -X POST http://127.0.0.1:8080/api/db/disconnect
+```
+
+response:
+
+```json
 {
   "code": 0,
   "data": null,
   "message": "Disconnect successfully"
+}
 ```