readme.md 43,2 ko
Newer Older
li195599's avatar
li195599 a validé
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
<div align="center">
	<br>
	<br>
	<img width="360" src="media/logo.svg" alt="Got">
	<br>
	<br>
	<br>
	<p align="center">Huge thanks to <a href="https://moxy.studio"><img src="https://sindresorhus.com/assets/thanks/moxy-logo.svg" width="150"></a> for sponsoring me!
	</p>
	<br>
	<br>
</div>

> Simplified HTTP requests

[![Build Status: Linux](https://travis-ci.org/sindresorhus/got.svg?branch=master)](https://travis-ci.org/sindresorhus/got) [![Coverage Status](https://coveralls.io/repos/github/sindresorhus/got/badge.svg?branch=master)](https://coveralls.io/github/sindresorhus/got?branch=master) [![Downloads](https://img.shields.io/npm/dm/got.svg)](https://npmjs.com/got) [![Install size](https://packagephobia.now.sh/badge?p=got)](https://packagephobia.now.sh/result?p=got)

Got is a human-friendly and powerful HTTP request library.

It was created because the popular [`request`](https://github.com/request/request) package is bloated: [![Install size](https://packagephobia.now.sh/badge?p=request)](https://packagephobia.now.sh/result?p=request)

Got is for Node.js. For browsers, we recommend [Ky](https://github.com/sindresorhus/ky).


## Highlights

- [Promise & stream API](#api)
- [Request cancelation](#aborting-the-request)
- [RFC compliant caching](#cache-adapters)
- [Follows redirects](#followredirect)
- [Retries on failure](#retry)
- [Progress events](#onuploadprogress-progress)
- [Handles gzip/deflate](#decompress)
- [Timeout handling](#timeout)
- [Errors with metadata](#errors)
- [JSON mode](#json)
- [WHATWG URL support](#url)
- [Hooks](#hooks)
- [Instances with custom defaults](#instances)
- [Composable](advanced-creation.md#merging-instances)
- [Electron support](#useelectronnet)
- [Used by ~2000 packages and ~500K repos](https://github.com/sindresorhus/got/network/dependents)
- Actively maintained

[Moving from Request?](migration-guides.md)

[See how Got compares to other HTTP libraries](#comparison)

## Install

```
$ npm install got
```

<a href="https://www.patreon.com/sindresorhus">
	<img src="https://c5.patreon.com/external/logo/become_a_patron_button@2x.png" width="160">
</a>


## Usage

```js
const got = require('got');

(async () => {
	try {
		const response = await got('sindresorhus.com');
		console.log(response.body);
		//=> '<!doctype html> ...'
	} catch (error) {
		console.log(error.response.body);
		//=> 'Internal server error ...'
	}
})();
```

###### Streams

```js
const fs = require('fs');
const got = require('got');

got.stream('sindresorhus.com').pipe(fs.createWriteStream('index.html'));

// For POST, PUT, and PATCH methods `got.stream` returns a `stream.Writable`
fs.createReadStream('index.html').pipe(got.stream.post('sindresorhus.com'));
```


### API

It's a `GET` request by default, but can be changed by using different methods or in the `options`.

#### got(url, [options])

Returns a Promise for a [`response` object](#response) or a [stream](#streams-1) if `options.stream` is set to true.

##### url

Type: `string` `Object`

The URL to request, as a string, a [`https.request` options object](https://nodejs.org/api/https.html#https_https_request_options_callback), or a [WHATWG `URL`](https://nodejs.org/api/url.html#url_class_url).

Properties from `options` will override properties in the parsed `url`.

If no protocol is specified, it will default to `https`.

##### options

Type: `Object`

Any of the [`https.request`](https://nodejs.org/api/https.html#https_https_request_options_callback) options.

###### baseUrl

Type: `string` `Object`

When specified, `url` will be prepended by `baseUrl`.<br>
If you specify an absolute URL, it will skip the `baseUrl`.

Very useful when used with `got.extend()` to create niche-specific Got instances.

Can be a string or a [WHATWG `URL`](https://nodejs.org/api/url.html#url_class_url).

Slash at the end of `baseUrl` and at the beginning of the `url` argument is optional:

```js
await got('hello', {baseUrl: 'https://example.com/v1'});
//=> 'https://example.com/v1/hello'

await got('/hello', {baseUrl: 'https://example.com/v1/'});
//=> 'https://example.com/v1/hello'

await got('/hello', {baseUrl: 'https://example.com/v1'});
//=> 'https://example.com/v1/hello'
```

###### headers

Type: `Object`<br>
Default: `{}`

Request headers.

Existing headers will be overwritten. Headers set to `null` will be omitted.

###### stream

Type: `boolean`<br>
Default: `false`

Returns a `Stream` instead of a `Promise`. This is equivalent to calling `got.stream(url, [options])`.

###### body

Type: `string` `Buffer` `stream.Readable` [`form-data` instance](https://github.com/form-data/form-data)

**Note:** If you provide this option, `got.stream()` will be read-only.

The body that will be sent with a `POST` request.

If present in `options` and `options.method` is not set, `options.method` will be set to `POST`.

The `content-length` header will be automatically set if `body` is a `string` / `Buffer` / `fs.createReadStream` instance / [`form-data` instance](https://github.com/form-data/form-data), and `content-length` and `transfer-encoding` are not manually set in `options.headers`.

###### cookieJar

Type: [`tough.CookieJar` instance](https://github.com/salesforce/tough-cookie#cookiejar)

**Note:** If you provide this option, `options.headers.cookie` will be overridden.

Cookie support. You don't have to care about parsing or how to store them. [Example.](#cookies)

###### encoding

Type: `string` `null`<br>
Default: `'utf8'`

[Encoding](https://nodejs.org/api/buffer.html#buffer_buffers_and_character_encodings) to be used on `setEncoding` of the response data. If `null`, the body is returned as a [`Buffer`](https://nodejs.org/api/buffer.html) (binary data).

###### form

Type: `boolean`<br>
Default: `false`

**Note:** If you provide this option, `got.stream()` will be read-only.
**Note:** `body` must be a plain object. It will be converted to a query string using [`(new URLSearchParams(object)).toString()`](https://nodejs.org/api/url.html#url_constructor_new_urlsearchparams_obj).

If set to `true` and `Content-Type` header is not set, it will be set to `application/x-www-form-urlencoded`.

###### json

Type: `boolean`<br>
Default: `false`

**Note:** If you use `got.stream()`, this option will be ignored.
**Note:** `body` must be a plain object or array and will be stringified.

If set to `true` and `Content-Type` header is not set, it will be set to `application/json`.

Parse response body with `JSON.parse` and set `accept` header to `application/json`. If used in conjunction with the `form` option, the `body` will the stringified as querystring and the response parsed as JSON.

###### query

Type: `string` `Object<string, string|number>` [`URLSearchParams`](https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams)

Query string that will be added to the request URL. This will override the query string in `url`.

If you need to pass in an array, you can do it using a `URLSearchParams` instance:

```js
const got = require('got');

const query = new URLSearchParams([['key', 'a'], ['key', 'b']]);

got('https://example.com', {query});

console.log(query.toString());
//=> 'key=a&key=b'
```

And if you need a different array format, you could use the [`query-string`](https://github.com/sindresorhus/query-string) package:

```js
const got = require('got');
const queryString = require('query-string');

const query = queryString.stringify({key: ['a', 'b']}, {arrayFormat: 'bracket'});

got('https://example.com', {query});

console.log(query);
//=> 'key[]=a&key[]=b'
```

###### timeout

Type: `number` `Object`

Milliseconds to wait for the server to end the response before aborting the request with [`got.TimeoutError`](#gottimeouterror) error (a.k.a. `request` property). By default, there's no timeout.

This also accepts an `object` with the following fields to constrain the duration of each phase of the request lifecycle:

- `lookup` starts when a socket is assigned and ends when the hostname has been resolved. Does not apply when using a Unix domain socket.
- `connect` starts when `lookup` completes (or when the socket is assigned if lookup does not apply to the request) and ends when the socket is connected.
- `secureConnect` starts when `connect` completes and ends when the handshaking process completes (HTTPS only).
- `socket` starts when the socket is connected. See [request.setTimeout](https://nodejs.org/api/http.html#http_request_settimeout_timeout_callback).
- `response` starts when the request has been written to the socket and ends when the response headers are received.
- `send` starts when the socket is connected and ends with the request has been written to the socket.
- `request` starts when the request is initiated and ends when the response's end event fires.

###### retry

Type: `number` `Object`<br>
Default:
- retries: `2`
- methods: `GET` `PUT` `HEAD` `DELETE` `OPTIONS` `TRACE`
- statusCodes: [`408`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/408) [`413`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/413) [`429`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/429) [`500`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/500) [`502`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/502) [`503`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/503) [`504`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/504)
- maxRetryAfter: `undefined`
- errorCodes: `ETIMEDOUT` `ECONNRESET` `EADDRINUSE` `ECONNREFUSED` `EPIPE` `ENOTFOUND` `ENETUNREACH` `EAI_AGAIN`

An object representing `retries`, `methods`, `statusCodes`, `maxRetryAfter` and `errorCodes` fields for the time until retry, allowed methods, allowed status codes, maximum [`Retry-After`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After) time and allowed error codes.

If `maxRetryAfter` is set to `undefined`, it will use `options.timeout`.<br>
If [`Retry-After`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After) header is greater than `maxRetryAfter`, it will cancel the request.

Delays between retries counts with function `1000 * Math.pow(2, retry) + Math.random() * 100`, where `retry` is attempt number (starts from 1).

The `retries` property can be a `number` or a `function` with `retry` and `error` arguments. The function must return a delay in milliseconds (`0` return value cancels retry).

By default, it retries *only* on the specified methods, status codes, and on these network errors:
- `ETIMEDOUT`: One of the [timeout](#timeout) limits were reached.
- `ECONNRESET`: Connection was forcibly closed by a peer.
- `EADDRINUSE`: Could not bind to any free port.
- `ECONNREFUSED`: Connection was refused by the server.
- `EPIPE`: The remote side of the stream being written has been closed.
- `ENOTFOUND`: Couldn't resolve the hostname to an IP address.
- `ENETUNREACH`: No internet connection.
- `EAI_AGAIN`: DNS lookup timed out.

###### followRedirect

Type: `boolean`<br>
Default: `true`

Defines if redirect responses should be followed automatically.

Note that if a `303` is sent by the server in response to any request type (`POST`, `DELETE`, etc.), Got will automatically request the resource pointed to in the location header via `GET`. This is in accordance with [the spec](https://tools.ietf.org/html/rfc7231#section-6.4.4).

###### decompress

Type: `boolean`<br>
Default: `true`

Decompress the response automatically. This will set the `accept-encoding` header to `gzip, deflate` unless you set it yourself.

If this is disabled, a compressed response is returned as a `Buffer`. This may be useful if you want to handle decompression yourself or stream the raw compressed data.

###### cache

Type: `Object`<br>
Default: `false`

[Cache adapter instance](#cache-adapters) for storing cached data.

###### request

Type: `Function`<br>
Default: `http.request` `https.request` *(depending on the protocol)*

Custom request function. The main purpose of this is to [support HTTP2 using a wrapper](#experimental-http2-support).

###### useElectronNet

Type: `boolean`<br>
Default: `false`

When used in Electron, Got will use [`electron.net`](https://electronjs.org/docs/api/net/) instead of the Node.js `http` module. According to the Electron docs, it should be fully compatible, but it's not entirely. See [#443](https://github.com/sindresorhus/got/issues/443) and [#461](https://github.com/sindresorhus/got/issues/461).

###### throwHttpErrors

Type: `boolean`<br>
Default: `true`

Determines if a `got.HTTPError` is thrown for error responses (non-2xx status codes).

If this is disabled, requests that encounter an error status code will be resolved with the `response` instead of throwing. This may be useful if you are checking for resource availability and are expecting error responses.

###### agent

Same as the [`agent` option](https://nodejs.org/api/http.html#http_http_request_url_options_callback) for `http.request`, but with an extra feature:

If you require different agents for different protocols, you can pass a map of agents to the `agent` option. This is necessary because a request to one protocol might redirect to another. In such a scenario, Got will switch over to the right protocol agent for you.

```js
const got = require('got');
const HttpAgent = require('agentkeepalive');
const {HttpsAgent} = HttpAgent;

got('sindresorhus.com', {
	agent: {
		http: new HttpAgent(),
		https: new HttpsAgent()
	}
});
```

###### hooks

Type: `Object<string, Function[]>`

Hooks allow modifications during the request lifecycle. Hook functions may be async and are run serially.

###### hooks.init

Type: `Function[]`<br>
Default: `[]`

Called with plain [request options](#options), right before their normalization. This is especially useful in conjunction with [`got.extend()`](#instances) and [`got.create()`](advanced-creation.md) when the input needs custom handling.

See the [Request migration guide](migration-guides.md#breaking-changes) for an example.

**Note**: This hook must be synchronous!

###### hooks.beforeRequest

Type: `Function[]`<br>
Default: `[]`

Called with [normalized](source/normalize-arguments.js) [request options](#options). Got will make no further changes to the request before it is sent. This is especially useful in conjunction with [`got.extend()`](#instances) and [`got.create()`](advanced-creation.md) when you want to create an API client that, for example, uses HMAC-signing.

See the [AWS section](#aws) for an example.

**Note:** If you modify the `body` you will need to modify the `content-length` header too, because it has already been computed and assigned.

###### hooks.beforeRedirect

Type: `Function[]`<br>
Default: `[]`

Called with [normalized](source/normalize-arguments.js) [request options](#options). Got will make no further changes to the request. This is especially useful when you want to avoid dead sites. Example:

```js
const got = require('got');

got('example.com', {
	hooks: {
		beforeRedirect: [
			options => {
				if (options.hostname === 'deadSite') {
					options.hostname = 'fallbackSite';
				}
			}
		]
	}
});
```

###### hooks.beforeRetry

Type: `Function[]`<br>
Default: `[]`

Called with [normalized](source/normalize-arguments.js) [request options](#options), the error and the retry count. Got will make no further changes to the request. This is especially useful when some extra work is required before the next try. Example:

```js
const got = require('got');

got('example.com', {
	hooks: {
		beforeRetry: [
			(options, error, retryCount) => {
				if (error.statusCode === 413) { // Payload too large
					options.body = getNewBody();
				}
			}
		]
	}
});
```

###### hooks.afterResponse

Type: `Function[]`<br>
Default: `[]`

Called with [response object](#response) and a retry function.

Each function should return the response. This is especially useful when you want to refresh an access token. Example:

```js
const got = require('got');

const instance = got.extend({
	hooks: {
		afterResponse: [
			(response, retryWithMergedOptions) => {
				if (response.statusCode === 401) { // Unauthorized
					const updatedOptions = {
						headers: {
							token: getNewToken() // Refresh the access token
						}
					};

					// Save for further requests
					instance.defaults.options = got.mergeOptions(instance.defaults.options, updatedOptions);

					// Make a new retry
					return retryWithMergedOptions(updatedOptions);
				}

				// No changes otherwise
				return response;
			}
		]
	},
	mutableDefaults: true
});
```

###### hooks.beforeError

Type: `Function[]`<br>
Default: `[]`

Called with an `Error` instance. The error is passed to the hook right before it's thrown. This is especially useful when you want to have more detailed errors.

**Note**: Errors thrown while normalizing input options are thrown directly and not part of this hook.

```js	
const got = require('got');	

got('api.github.com/some-endpoint', {	
	hooks: {	
		onError: [	
			error => {	
				const {response} = error;	
 				if (response && response.body) {	
					error.name = 'GitHubError';	
					error.message = `${response.body.message} (${error.statusCode})`;	
				}

 				return error;	
			}	
		]	
	}	
});	
```

#### Response

The response object will typically be a [Node.js HTTP response stream](https://nodejs.org/api/http.html#http_class_http_incomingmessage), however, if returned from the cache it will be a [response-like object](https://github.com/lukechilds/responselike) which behaves in the same way.

##### request

Type: `Object`

**Note:** This is not a [http.ClientRequest](https://nodejs.org/api/http.html#http_class_http_clientrequest).

- `gotOptions` - The options that were set on this request.

##### body

Type: `string` `Object` *(depending on `options.json`)*

The result of the request.

##### url

Type: `string`

The request URL or the final URL after redirects.

##### requestUrl

Type: `string`

The original request URL.

##### timings

Type: `Object`

The object contains the following properties:

- `start` - Time when the request started.
- `socket` - Time when a socket was assigned to the request.
- `lookup` - Time when the DNS lookup finished.
- `connect` - Time when the socket successfully connected.
- `upload` - Time when the request finished uploading.
- `response` - Time when the request fired the `response` event.
- `end` - Time when the response fired the `end` event.
- `error` - Time when the request fired the `error` event.
- `phases`
	- `wait` - `timings.socket - timings.start`
	- `dns` - `timings.lookup - timings.socket`
	- `tcp` - `timings.connect - timings.lookup`
	- `request` - `timings.upload - timings.connect`
	- `firstByte` - `timings.response - timings.upload`
	- `download` - `timings.end - timings.response`
	- `total` - `timings.end - timings.start` or `timings.error - timings.start`

**Note:** The time is a `number` representing the milliseconds elapsed since the UNIX epoch.

##### fromCache

Type: `boolean`

Whether the response was retrieved from the cache.

##### redirectUrls

Type: `Array`

The redirect URLs.

##### retryCount

Type: `number`

The number of times the request was retried.

#### Streams

**Note:** Progress events, redirect events and request/response events can also be used with promises.

#### got.stream(url, [options])

Sets `options.stream` to `true`.

Returns a [duplex stream](https://nodejs.org/api/stream.html#stream_class_stream_duplex) with additional events:

##### .on('request', request)

`request` event to get the request object of the request.

**Tip:** You can use `request` event to abort request:

```js
got.stream('github.com')
	.on('request', request => setTimeout(() => request.abort(), 50));
```

##### .on('response', response)

The `response` event to get the response object of the final request.

##### .on('redirect', response, nextOptions)

The `redirect` event to get the response object of a redirect. The second argument is options for the next request to the redirect location.

##### .on('uploadProgress', progress)
##### .on('downloadProgress', progress)

Progress events for uploading (sending a request) and downloading (receiving a response). The `progress` argument is an object like:

```js
{
	percent: 0.1,
	transferred: 1024,
	total: 10240
}
```

If it's not possible to retrieve the body size (can happen when streaming), `total` will be `null`.

```js
(async () => {
	const response = await got('sindresorhus.com')
		.on('downloadProgress', progress => {
			// Report download progress
		})
		.on('uploadProgress', progress => {
			// Report upload progress
		});

	console.log(response);
})();
```

##### .on('error', error, body, response)

The `error` event emitted in case of a protocol error (like `ENOTFOUND` etc.) or status error (4xx or 5xx). The second argument is the body of the server response in case of status error. The third argument is a response object.

#### got.get(url, [options])
#### got.post(url, [options])
#### got.put(url, [options])
#### got.patch(url, [options])
#### got.head(url, [options])
#### got.delete(url, [options])

Sets `options.method` to the method name and makes a request.

### Instances

#### got.extend([options])

Configure a new `got` instance with default `options`. The `options` are merged with the parent instance's `defaults.options` using [`got.mergeOptions`](#gotmergeoptionsparentoptions-newoptions). You can access the resolved options with the `.defaults` property on the instance.

```js
const client = got.extend({
	baseUrl: 'https://example.com',
	headers: {
		'x-unicorn': 'rainbow'
	}
});

client.get('/demo');

/* HTTP Request =>
 * GET /demo HTTP/1.1
 * Host: example.com
 * x-unicorn: rainbow
 */
```

```js
(async () => {
	const client = got.extend({
		baseUrl: 'httpbin.org',
		headers: {
			'x-foo': 'bar'
		}
	});
	const {headers} = (await client.get('/headers', {json: true})).body;
	//=> headers['x-foo'] === 'bar'

	const jsonClient = client.extend({
		json: true,
		headers: {
			'x-baz': 'qux'
		}
	});
	const {headers: headers2} = (await jsonClient.get('/headers')).body;
	//=> headers2['x-foo'] === 'bar'
	//=> headers2['x-baz'] === 'qux'
})();
```

**Tip:** Need more control over the behavior of Got? Check out the [`got.create()`](advanced-creation.md).

#### got.mergeOptions(parentOptions, newOptions)

Extends parent options. Avoid using [object spread](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax#Spread_in_object_literals) as it doesn't work recursively:

```js
const a = {headers: {cat: 'meow', wolf: ['bark', 'wrrr']}};
const b = {headers: {cow: 'moo', wolf: ['auuu']}};

{...a, ...b}            // => {headers: {cow: 'moo', wolf: ['auuu']}}
got.mergeOptions(a, b)  // => {headers: {cat: 'meow', cow: 'moo', wolf: ['auuu']}}
```

Options are deeply merged to a new object. The value of each key is determined as follows:

- If the new property is set to `undefined`, it keeps the old one.
- If the parent property is an instance of `URL` and the new value is a `string` or `URL`, a new URL instance is created: [`new URL(new, parent)`](https://developer.mozilla.org/en-US/docs/Web/API/URL/URL#Syntax).
- If the new property is a plain `Object`:
	- If the parent property is a plain `Object` too, both values are merged recursively into a new `Object`.
	- Otherwise, only the new value is deeply cloned.
- If the new property is an `Array`, it overwrites the old one with a deep clone of the new property.
- Otherwise, the new value is assigned to the key.

#### got.defaults

Type: `Object`

The default Got options.

## Errors

Each error contains `host`, `hostname`, `method`, `path`, `protocol`, `url` and `gotOptions` properties to make debugging easier.

In Promise mode, the `response` is attached to the error.

#### got.CacheError

When a cache method fails, for example, if the database goes down or there's a filesystem error.

#### got.RequestError

When a request fails. Contains a `code` property with error class code, like `ECONNREFUSED`.

#### got.ReadError

When reading from response stream fails.

#### got.ParseError

When `json` option is enabled, server response code is 2xx, and `JSON.parse` fails. Includes `statusCode` and `statusMessage` properties.

#### got.HTTPError

When the server response code is not 2xx. Includes `body`, `statusCode`, `statusMessage`, and `redirectUrls` properties.

#### got.MaxRedirectsError

When the server redirects you more than ten times. Includes a `statusCode`, `statusMessage`, and `redirectUrls` property which is an array of the URLs Got was redirected to before giving up.

#### got.UnsupportedProtocolError

When given an unsupported protocol.

#### got.CancelError

When the request is aborted with `.cancel()`.

#### got.TimeoutError

When the request is aborted due to a [timeout](#timeout). Includes an `event` property.

## Aborting the request

The promise returned by Got has a [`.cancel()`](https://github.com/sindresorhus/p-cancelable) method which when called, aborts the request.

```js
(async () => {
	const request = got(url, options);

	// …

	// In another part of the code
	if (something) {
		request.cancel();
	}

	// …

	try {
		await request;
	} catch (error) {
		if (request.isCanceled) { // Or `error instanceof got.CancelError`
			// Handle cancelation
		}

		// Handle other errors
	}
})();
```

<a name="cache-adapters"></a>
## Cache

Got implements [RFC 7234](http://httpwg.org/specs/rfc7234.html) compliant HTTP caching which works out of the box in-memory and is easily pluggable with a wide range of storage adapters. Fresh cache entries are served directly from the cache, and stale cache entries are revalidated with `If-None-Match`/`If-Modified-Since` headers. You can read more about the underlying cache behavior in the [`cacheable-request` documentation](https://github.com/lukechilds/cacheable-request).

You can use the JavaScript `Map` type as an in-memory cache:

```js
const got = require('got');
const map = new Map();

(async () => {
		let response = await got('sindresorhus.com', {cache: map});
		console.log(response.fromCache);
		//=> false

		response = await got('sindresorhus.com', {cache: map});
		console.log(response.fromCache);
		//=> true
})();
```

Got uses [Keyv](https://github.com/lukechilds/keyv) internally to support a wide range of storage adapters. For something more scalable you could use an [official Keyv storage adapter](https://github.com/lukechilds/keyv#official-storage-adapters):

```
$ npm install @keyv/redis
```

```js
const got = require('got');
const KeyvRedis = require('@keyv/redis');

const redis = new KeyvRedis('redis://user:pass@localhost:6379');

got('sindresorhus.com', {cache: redis});
```

Got supports anything that follows the Map API, so it's easy to write your own storage adapter or use a third-party solution.

For example, the following are all valid storage adapters:

```js
const storageAdapter = new Map();
// Or
const storageAdapter = require('./my-storage-adapter');
// Or
const QuickLRU = require('quick-lru');
const storageAdapter = new QuickLRU({maxSize: 1000});

got('sindresorhus.com', {cache: storageAdapter});
```

View the [Keyv docs](https://github.com/lukechilds/keyv) for more information on how to use storage adapters.


## Proxies

You can use the [`tunnel`](https://github.com/koichik/node-tunnel) package with the `agent` option to work with proxies:

```js
const got = require('got');
const tunnel = require('tunnel');

got('sindresorhus.com', {
	agent: tunnel.httpOverHttp({
		proxy: {
			host: 'localhost'
		}
	})
});
```

Check out [`global-tunnel`](https://github.com/np-maintain/global-tunnel) if you want to configure proxy support for all HTTP/HTTPS traffic in your app.


## Cookies

You can use the [`tough-cookie`](https://github.com/salesforce/tough-cookie) package:

```js
const got = require('got');
const {CookieJar} = require('tough-cookie');

const cookieJar = new CookieJar();
cookieJar.setCookie('foo=bar', 'https://www.google.com');

got('google.com', {cookieJar});
```


## Form data

You can use the [`form-data`](https://github.com/form-data/form-data) package to create POST request with form data:

```js
const fs = require('fs');
const got = require('got');
const FormData = require('form-data');
const form = new FormData();

form.append('my_file', fs.createReadStream('/foo/bar.jpg'));

got.post('google.com', {
	body: form
});
```


## OAuth

You can use the [`oauth-1.0a`](https://github.com/ddo/oauth-1.0a) package to create a signed OAuth request:

```js
const got = require('got');
const crypto  = require('crypto');
const OAuth = require('oauth-1.0a');

const oauth = OAuth({
	consumer: {
		key: process.env.CONSUMER_KEY,
		secret: process.env.CONSUMER_SECRET
	},
	signature_method: 'HMAC-SHA1',
	hash_function: (baseString, key) => crypto.createHmac('sha1', key).update(baseString).digest('base64')
});

const token = {
	key: process.env.ACCESS_TOKEN,
	secret: process.env.ACCESS_TOKEN_SECRET
};

const url = 'https://api.twitter.com/1.1/statuses/home_timeline.json';

got(url, {
	headers: oauth.toHeader(oauth.authorize({url, method: 'GET'}, token)),
	json: true
});
```


## Unix Domain Sockets

Requests can also be sent via [unix domain sockets](http://serverfault.com/questions/124517/whats-the-difference-between-unix-socket-and-tcp-ip-socket). Use the following URL scheme: `PROTOCOL://unix:SOCKET:PATH`.

- `PROTOCOL` - `http` or `https` *(optional)*
- `SOCKET` - Absolute path to a unix domain socket, for example: `/var/run/docker.sock`
- `PATH` - Request path, for example: `/v2/keys`

```js
got('http://unix:/var/run/docker.sock:/containers/json');

// Or without protocol (HTTP by default)
got('unix:/var/run/docker.sock:/containers/json');
```


## AWS

Requests to AWS services need to have their headers signed. This can be accomplished by using the [`aws4`](https://www.npmjs.com/package/aws4) package. This is an example for querying an ["API Gateway"](https://docs.aws.amazon.com/apigateway/api-reference/signing-requests/) with a signed request.

```js
const AWS = require('aws-sdk');
const aws4 = require('aws4');
const got = require('got');

const chain = new AWS.CredentialProviderChain();

// Create a Got instance to use relative paths and signed requests
const awsClient = got.extend({
	baseUrl: 'https://<api-id>.execute-api.<api-region>.amazonaws.com/<stage>/',
	hooks: {
		beforeRequest: [
			async options => {
				const credentials = await chain.resolvePromise();
				aws4.sign(options, credentials);
			}
		]
	}
});

const response = await awsClient('endpoint/path', {
	// Request-specific options
});
```


## Testing

You can test your requests by using the [`nock`](https://github.com/node-nock/nock) package to mock an endpoint:

```js
const got = require('got');
const nock = require('nock');

nock('https://sindresorhus.com')
	.get('/')
	.reply(200, 'Hello world!');

(async () => {
	const response = await got('sindresorhus.com');
	console.log(response.body);
	//=> 'Hello world!'
})();
```

If you need real integration tests you can use [`create-test-server`](https://github.com/lukechilds/create-test-server):

```js
const got = require('got');
const createTestServer = require('create-test-server');

(async () => {
	const server = await createTestServer();
	server.get('/', 'Hello world!');

	const response = await got(server.url);
	console.log(response.body);
	//=> 'Hello world!'

	await server.close();