public/web-development/presentation.git

			@@ -688,14 +688,212 @@
			</section>
			<section>
			<ul>
			<li>Befindet sich auf den OSI-Schichten 5, 6 und 7</li>
			<li>Basiert auf dem Anfrage-Antwort-Prinzip</li>
			<li>Basiert auf reinem Text</li>
			<li>OSI-Schichten 5, 6 und 7</li>
			<li>Anfrage-Antwort-Prinzip</li>
			<li>Basiert auf einfachem Text</li>
			</ul>
			</section>
			<section>
			<p><code>npm install http-server</code></p>
			<p><code>npx http-server --port 3000</code></p>
			<table>
			<tr><th>Version</th><th>Jahr</th></tr>
			<tr><th>0.9</th><th>1991</th></tr>
			<tr><th>1.0</th><th>1996</th></tr>
			<tr><th>1.1</th><th>1999</th></tr>
			<tr><th>2.0</th><th>2015</th></tr>
			<tr><th>3.0</th><th>2022</th></tr>
			</table>
			</section>
			<section>
			<p>Request an www.google.de</p>
			<pre>
			<code class="http" data-trim data-line-numbers>
			GET / HTTP/1.1
			Host: www.google.de
			User-Agent: curl/7.88.1
			Accept: /
			</code>
			</pre>
			</section>
			<section>
			<p>Response von www.google.de</p>
			<pre>
			<code class="http" data-trim data-line-numbers>
			HTTP/1.1 200 OK
			Date: Tue, 04 Apr 2023 15:45:26 GMT
			Expires: -1
			Cache-Control: private, max-age=0
			Content-Type: text/html; charset=ISO-8859-1
			Content-Security-Policy-Report-Only: [...]
			Server: gws
			X-XSS-Protection: 0
			X-Frame-Options: SAMEORIGIN
			Set-Cookie: [...]
			Accept-Ranges: none
			Vary: Accept-Encoding
			Transfer-Encoding: chunked

			<!doctype html><html>...</html>
			</code>
			</pre>
			</section>
			<section>
			<p>Einfach mal testen:</p>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			curl -v --http1.0 http://www.google.de
			curl -v --http1.1 http://www.google.de
			curl -v --http2 http://www.google.de
			curl -v --http2-prior-knowledge http://www.google.de
			curl -v --http3 http://www.google.de
			</code>
			</pre>
			</section>
			<section>
			<p>Verschiedene "Verben" bzw. "Methoden"</p>
			<ul>
			<li>GET</li>
			<li>POST</li>
			<li>PUT</li>
			<li>PATCH</li>
			<li>DELETE</li>
			<li>...</li>
			</ul>
			</section>
			<section>
			<p>Beispiel:</p>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			git clone https://git.furnco.de/r/public/web-development/examples.git
			cd examples/templates/005-http-rest
			node index.js
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="text" data-trim data-line-numbers>
			curl -X GET -is http://localhost:3000/todo
			curl -X POST -H "Content-Type: application/json" -d '{"name": "Einkaufen"}' -is http://localhost:3000/todo
			curl -X POST -H "Content-Type: application/json" -d '{"name": "Putzen"}' -is http://localhost:3000/todo
			curl -X PUT -H "Content-Type: application/json" -d '{"name": "Schlafen"}' -is http://localhost:3000/todo/1
			curl -X DELETE -is http://localhost:3000/todo/0
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="text" data-trim data-line-numbers>
			HTTP/1.1 200 OK
			X-Powered-By: Express
			Content-Type: application/json; charset=utf-8
			Content-Length: 13
			ETag: W/"d-KMmUcQ1kigqtwzZnU+jVDkYP3Co"
			Date: Wed, 05 Apr 2023 12:05:05 GMT
			Connection: keep-alive
			Keep-Alive: timeout=5

			["Einkaufen"]
			</code>
			</pre>
			</section>
			<section>
			<pre>
			<code class="js" data-trim data-line-numbers="">
			app.get("/todo", (req, res) => {
			return res.json(todos);
			});

			// [...]

			app.post("/todo", (req, res) => {
			// [...]
			return res.json(todos);
			// [...]
			});
			</code>
			</pre>
			</section>
			<section>
			<p><code>GET</code> und <code>POST</code> auf klassischen Webseiten</p>
			<pre>
			<code class="html" data-trim data-line-numbers>
			<form method="post" action="/todo">
			<input name="todo"><button>add</button>
			</form>
			</code>
			</pre>
			<p>Beispiel:</p>
			<pre>
			<code class="bash" data-trim data-line-numbers>
			cd examples/templates/006-http-web
			node index.js
			</code>
			</pre>
			</section>
			</section>
			<section>
			<section>
			<h3>JSON</h3>
			</section>
			<section>
			<ul>
			<li><em class="h">J</em>ava<em class="h">S</em>cript <em class="h">O</em>bject <em class="h">N</em>otation</li>
			<li>Basiert auf reinem Text</li>
			<li>Format zur strukturierten Speicherung von Daten</li>
			<li>Attribute müssen immer in doppelte Anführungsstriche (<code>"</code>) gesetzt werden</li>
			</ul>
			</section>
			<section>
			<p>Definition eines einfachen Objekts in JS</p>
			<pre>
			<code class="js" data-trim data-line-numbers>
			const o = {
			x: 1,
			y: 2
			};
			</code>
			</pre>
			</section>
			<section>
			<p>Entsprechung in JSON</p>
			<pre>
			<code class="js" data-trim data-line-numbers>
			{
			"x": 1,
			"y": 2
			}
			</code>
			</pre>
			</section>
			<section>
			<p>Mögliche Typen</p>
			<p>
			<ul>
			<li>Number (bzw. Integer / Float)</li>
			<li>Boolean</li>
			<li>String</li>
			<li>Array</li>
			<li>Object</li>
			</ul>
			</p>
			</section>
			<section>
			<p>Der äußere Container kann ein Array oder ein Object sein</p>
			<pre>
			<code class="js" data-trim data-line-numbers>
			{
			"key": "value",
			}
			</code>
			</pre>
			<pre>
			<code class="js" data-trim data-line-numbers>
			[
			"foo",
			"bar"
			]
			</code>
			</pre>
			</section>
			</section>
			</div>