suppor to dump {head|body|document} dom

.gitignore

@@ -1 +1,2 @@
-node_modules/
+node_modules/
+.idea/

README.md

@@ -55,15 +55,32 @@ docker run -it -p 8080:8080 --cap-add SYS_ADMIN --name bot-render-container bot-
 
 Send a request to the server running inside the container:
 ```bash
-curl http://localhost:8080/?url=https://dynamic-meta.appspot.com
+curl -X GET "http://localhost:8080/?url={urlToDump}&dom={document|body|head}"
+```
+Examples:
+
+```bash
+# To dump head dom (Default)
+curl -X GET "http://localhost:8080/?url=https://dynamic-meta.appspot.com&dom=head"
+
+# To dump body dom
+curl -X GET "http://localhost:8080/?url=https://dynamic-meta.appspot.com&dom=body"
+
+# To dump document dom
+curl -X GET "http://localhost:8080/?url=https://dynamic-meta.appspot.com&dom=document"
 ```
 
 Stop the container:
 ```bash
-docker kill bot-render-container
+docker stop bot-render-container
+```
+
+Remove the container:
+```bash
+docker rm bot-render-container
 ```
 
-Clear containers:
+Clear all containers:
 ```bash
 docker rm -f $(docker ps -a -q)
 ```

src/main.js

@@ -7,8 +7,8 @@ const express = require('express');
 const app = express();
 
 app.get('/', async function(request, response) {
-  const head = await new Renderer(request.query.url).extractHead().catch((err) => console.error(err));
-  response.send(head);
+  const dom = await new Renderer(request.query.url).extractDOM(request.query.dom).catch((err) => console.error(err));
+  response.send(dom);
 });
 
 app.get('/_ah/health', (request, response) => response.send('OK'));

src/renderer.js

@@ -7,7 +7,7 @@ class Renderer {
     this._url = url;
   }
 
-  extractHead() {
+  extractDOM(htmlElement) {
     return new Promise((resolve, reject) => {
       CDP.New().then((tab) => {
         return CDP({tab: tab});
@@ -31,10 +31,11 @@ class Renderer {
             Page.navigate({url: this._url});
           });
 
-          // Load and dump DOM of head element.
+          // Load and dump DOM of {head(default)|body|document} element.
           Page.loadEventFired(() => {
             setTimeout(async() => {
-              let result = await Runtime.evaluate({expression: 'document.head.outerHTML'});
+              let expression = htmlElement == 'document'? 'document.documentElement.outerHTML' : (htmlElement == 'body' ? 'document.body.outerHTML' : 'document.head.outerHTML');
+              let result = await Runtime.evaluate({expression: expression});
               CDP.Close({id: client.tab.id});
               resolve(result.result.value);
             }, 1500);