Add quick start guide (#2059)

Co-authored-by: Sindre Sorhus <[email protected]>
Co-authored-by: Szymon Marczak <[email protected]>

documentation/quick-start.md

@@ -0,0 +1,234 @@
+# Quick Start Guide
+
+## Getting and posting data with promises
+
+The simplest `GET` request:
+
+```js
+import got from 'got';
+
+const url = 'https://httpbin.org/anything';
+const response = await got(url);
+```
+
+The call returns a <code>Promise<[Response](3-streams.md#response-1)></code>. If the body contains JSON, it can be retrieved directly:
+
+```js
+import got from 'got';
+
+const url = 'https://httpbin.org/anything';
+const data = await got(url).json();
+```
+
+The similar <code>[got.text](1-promise.md#promisetext)</code> method returns plain text.
+
+All `got` methods accept an options object for passing extra configuration, such as headers:
+
+```js
+import got from 'got';
+
+const url = 'https://httpbin.org/anything';
+
+const options = {
+	headers: {
+		'Custom-Header': 'Quick start',
+	},
+	timeout: {
+		send: 3500
+	},
+};
+
+const data = await got(url, options).json();
+```
+
+A `POST` request is very similar:
+
+```js
+import got from 'got';
+
+const url = 'https://httpbin.org/anything';
+
+const options = {
+	json: {
+		documentName: 'Quick Start',
+	},
+};
+
+const data = await got.post(url, options);
+```
+
+The request body is passed in the options object. The `json` property will automatically set headers accordingly. Custom headers can be added exactly as above.
+
+## Using streams
+
+The [Stream API](3-streams.md) allows to leverage [Node.js Streams](https://nodejs.dev/learn/nodejs-streams) capabilities:
+
+```js
+import fs from 'node:fs';
+import {pipeline} from 'node:stream/promises';
+import got from 'got';
+
+const url = 'https://httpbin.org/anything';
+
+const options = {
+	json: {
+		documentName: 'Quick Start',
+	},
+};
+
+const gotStream = got.stream.post(url, options);
+
+const outStream = fs.createWriteStream('anything.json');
+
+try {
+	await pipeline(gotStream, outStream);
+} catch (error) {
+	console.error(error);
+}
+```
+
+## Options
+
+Options can be set at the client level and reused in subsequent queries:
+
+```js
+import got from 'got';
+
+const options = {
+	prefixUrl: 'https://httpbin.org',
+	headers: {
+		Authorization: getTokenFromVault(),
+	},
+};
+
+const client = got.extend(options);
+
+export default client;
+```
+
+Some noticeable common options are:
+- [`searchParams`](2-options.md#searchparams): A query string object.
+- [`prefixUrl`](2-options.md#prefixurl): Prepended to query paths. Paths must be relative to prefix, i.e. not begin with a `/`.
+- [`method`](2-options.md#method): The HTTP method name.
+- [`headers`](2-options.md#headers): Query headers.
+- [`json`](2-options.md#json): JSON body.
+- [`form`](2-options.md#form): A form query string object.
+
+See the documentation for other [options](2-options.md#options).
+
+## Errors
+
+Both Promise and Stream APIs throw errors with metadata.
+
+```js
+import got from 'got';
+
+try {
+	const data = await got.get('https://httpbin.org/status/404');
+} catch (error) {
+	console.error(error.response.statusCode);
+}
+```
+
+```js
+import got from 'got';
+
+const stream = got.stream
+	.get('https://httpbin.org/status/404')
+	.once('error', error => {
+		console.error(error.response.statusCode);
+	});
+```
+
+## Miscellaneous
+
+The HTTP method name can also be given as an option, this may be convenient when it is known only at runtime:
+
+```js
+import got from 'got';
+
+const url = 'https://httpbin.org/anything';
+
+const method = 'POST';
+
+const options = {
+	method,
+	json: {
+		documentName: 'Quick Start',
+	},
+};
+
+const data = await got(url, options);
+```
+
+For most apps, HTTP clients just do `GET` and `POST` queries (`PUT`, `PATCH` or `DELETE` methods work similarly).
+The following sections will give some pointers to more advanced usage.
+
+### Timeouts
+
+By default, requests have no timeout. It is a good practice to set one:
+
+```js
+import got from 'got';
+
+const options = {
+	timeout: {
+		request: 10000,
+	},
+};
+
+const client = got.extend(options);
+
+export default client;
+```
+
+The above sets a global timeout of 10000 milliseconds for all requests issued by the exported `client`. Like all options, timeouts can also be set at the request level. See the [`timeout` option](6-timeout.md#timeout-options).
+
+### Retries
+
+A failed request is retried twice. The retry policy may be tuned with a [`retry`](7-retry.md#retry) options object.
+
+```js
+import got from 'got';
+
+const options = {
+	retry: {
+		limit: 5,
+		errorCodes: [
+			'ETIMEDOUT'
+		],
+	},
+};
+```
+
+Retries with stream are a little trickier, see [`stream.on('retry', …)`](3-streams.md#streamonretry-).
+
+### Hooks
+
+Hooks are custom functions called on some request events:
+
+```js
+import got from 'got';
+
+const logRetry = (error, retryCount) => {
+	console.error(`Retrying after error ${error.code}, retry #: ${retryCount}`);
+};
+
+const options = {
+	hooks: {
+		beforeRetry: [
+			logRetry,
+		],
+	},
+};
+
+const client = got.extend(options);
+
+export default client;
+```
+
+*Note that hooks are given as arrays*, thus multiple hooks can be given. See documentation for other possible [hooks](9-hooks.md#hooks-api).
+
+### Going further
+
+There is a lot more to discover in the [documentation](../readme.md#documentation) and [tips](tips.md#tips). Among others, `Got` can handle [cookies](tips.md#cookies), [pagination](4-pagination.md#pagination-api), [cache](cache.md#cache). Please read the documentation before implementing something that is already done by `Got` :innocent:.

readme.md

@@ -109,6 +109,8 @@ npm install got
 
 ## Take a peek
 
+**A [quick start](documentation/quick-start.md) guide is available.**
+
 ### JSON mode
 
 Got has a dedicated option for handling JSON payload.\