Update 'DEMO.md'

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@@ -12,4 +12,32 @@ User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML,
 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
 Accept-Encoding: gzip, deflate
 Accept-Language: en-US,en;q=0.9,fr;q=0.8
-```
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+```
+
+## HTTP/1.1 Response
+
+An HTTP <u>response</u> looks like this:
+```http
+HTTP/1.1 200 OK
+Server: nginx
+Date: Sun, 07 Nov 2021 16:25:17 GMT
+Content-Type: text/html; charset=utf-8
+Content-Length: 14
+Connection: keep-alive
+X-Frame-Options: SAMEORIGIN
+X-XSS-Protection: 1; mode=block
+Cache-Control: private, no-cache, no-store, must-revalidate
+X-Content-Type-Options: nosniff
+Pragma: no-cache
+Expires: Sat, 01 Jan 2000 00:00:00 GMT
+Referrer-Policy: no-referrer-when-downgrade
+
+The content goes here.
+```
+
+* The empty line is important as it marks the end of the headers and the start of the actual content.
+
+The following headers are especially important:
+* `Content-Type` marks the type of content and what the browser needs to do with it.
+* `Server` is the name of the server software. We'll probably put `Bashweb/1.0 <https://source.minteck.org/minteck/bashweb>` in here.
+* `Content-Length` is not required but recommended, especially with file downloads.
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