request-promise

by request

request /request-promise

The simplified HTTP request client 'request' with Promise support. Powered by Bluebird.

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Request-Promise

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Deprecated!

As of Feb 11th 2020,

request
is fully deprecated. No new changes are expected to land. In fact, none have landed for some time. This package is also deprecated because it depends on

request
.

Fyi, here is the reasoning of

request
's deprecation and a list of alternative libraries.


The simplified HTTP request client 'request' with Promise support. Powered by Bluebird.

Request and Bluebird are pretty awesome, but I found myself using the same design pattern. Request-Promise adds a Bluebird-powered

.then(...)
method to Request call objects. By default, http response codes other than 2xx will cause the promise to be rejected. This can be overwritten by setting
options.simple = false
.

Also check out the new libraries that are very similar to

request-promise
v4: -
request-promise-native
v1 – Does not depend on Bluebird and uses native ES6 promises instead. -
request-promise-any
v1 – Allows you to register any Promise library supported by
any-promise
.


Migration from v3 to v4

  1. request
    became a peer dependency. Thus make sure that
    request
    is installed into your project as a direct dependency. (
    npm install --save request
    )
  2. Continuation Local Storage is no longer supported. However, you can get back the support by using
    request-promise-any
    .
  3. When you migrated your
    transform
    function to v3 and had to add
    if (!(/^2/.test('' + response.statusCode))) { return resolveWithFullResponse ? response : body; }
    you may now set the option
    transform2xxOnly = true
    instead.

Migration from v2 to v3

  1. The handling of the

    transform
    function got overhauled. This has two effects:
    • StatusCodeError.response
      is the transformed instead of the original response now. This error is thrown for non-2xx responses when
      options.simple
      is
      true
      (default). Please update your
      transform
      functions to also cover the transformation of non-2xx responses. To get the old behavior you may add
      if (!(/^2/.test('' + response.statusCode))) { return resolveWithFullResponse ? response : body; }
      to the first line of your
      transform
      functions that are used for requests with
      options.simple === true
      . However, you may prefer updating your
      transform
      functions to being able to transform 2xx as well as non-2xx responses because this decouples their implementation from the use of the
      simple
      option when doing requests.
    • If a transform operation throws an error, the request will be rejected with a
      TransformError
      . Its
      cause
      attribute contains the error thrown by the transform operation. Previously, the request was rejected directly with the error thrown by the transform operation. Wrapping it into a
      TransformError
      makes the error handling easier.
  2. Bluebird got updated from v2 to v3. This won't make a difference for most use cases. However, if you use advanced Promise chains starting with the Promise returned by Request-Promise, please check Bluebird's new features and changes.


Installation

This module is installed via npm:

npm install --save request
npm install --save request-promise

request
is defined as a peer-dependency and thus has to be installed separately.

Cheat Sheet

var rp = require('request-promise');

Since

request-promise
wraps around
request
everything that works with
request
also works with
request-promise
. Also check out the
request
docs
for more examples.

Crawl a webpage

rp('http://www.google.com')
    .then(function (htmlString) {
        // Process html...
    })
    .catch(function (err) {
        // Crawling failed...
    });

Crawl a webpage better

var cheerio = require('cheerio'); // Basically jQuery for node.js

var options = { uri: 'http://www.google.com', transform: function (body) { return cheerio.load(body); } };

rp(options) .then(function ($) { // Process html like you would with jQuery... }) .catch(function (err) { // Crawling failed or Cheerio choked... });

GET something from a JSON REST API

var options = {
    uri: 'https://api.github.com/user/repos',
    qs: {
        access_token: 'xxxxx xxxxx' // -> uri + '?access_token=xxxxx%20xxxxx'
    },
    headers: {
        'User-Agent': 'Request-Promise'
    },
    json: true // Automatically parses the JSON string in the response
};

rp(options) .then(function (repos) { console.log('User has %d repos', repos.length); }) .catch(function (err) { // API call failed... });

POST data to a JSON REST API

Set

option.body
to your data and
json: true
to encode the body as JSON. See below for HTML forms.
var options = {
    method: 'POST',
    uri: 'http://api.posttestserver.com/post',
    body: {
        some: 'payload'
    },
    json: true // Automatically stringifies the body to JSON
};

rp(options) .then(function (parsedBody) { // POST succeeded... }) .catch(function (err) { // POST failed... });

POST like HTML forms do

Pass your data to

options.form
to encode the body the same way as HTML forms do:
var options = {
    method: 'POST',
    uri: 'http://posttestserver.com/post.php',
    form: {
        // Like 
        name: 'Josh'
    },
    headers: {
        /* 'content-type': 'application/x-www-form-urlencoded' */ // Is set automatically
    }
};

rp(options) .then(function (body) { // POST succeeded... }) .catch(function (err) { // POST failed... });

If you want to include a file upload then use

options.formData
:
var options = {
    method: 'POST',
    uri: 'http://posttestserver.com/post.php',
    formData: {
        // Like 
        name: 'Jenn',
        // Like 
        file: {
            value: fs.createReadStream('test/test.jpg'),
            options: {
                filename: 'test.jpg',
                contentType: 'image/jpg'
            }
        }
    },
    headers: {
        /* 'content-type': 'multipart/form-data' */ // Is set automatically
    }
};

rp(options) .then(function (body) { // POST succeeded... }) .catch(function (err) { // POST failed... });

Include a cookie

var tough = require('tough-cookie');

// Easy creation of the cookie - see tough-cookie docs for details let cookie = new tough.Cookie({ key: "some_key", value: "some_value", domain: 'api.mydomain.com', httpOnly: true, maxAge: 31536000 });

// Put cookie in an jar which can be used across multiple requests var cookiejar = rp.jar(); cookiejar.setCookie(cookie, 'https://api.mydomain.com'); // ...all requests to https://api.mydomain.com will include the cookie

var options = { uri: 'https://api.mydomain.com/...', jar: cookiejar // Tells rp to include cookies in jar that match uri };

rp(options) .then(function (body) { // Request succeeded... }) .catch(function (err) { // Request failed... });

Get the full response instead of just the body

var options = {
    method: 'DELETE',
    uri: 'http://my-server/path/to/resource/1234',
    resolveWithFullResponse: true    //  

Get a rejection only if the request failed for technical reasons

var options = {
    uri: 'http://www.google.com/this-page-does-not-exist.html',
    simple: false    //  

For more options checkout the Request docs.


API in Detail

Consider Request-Promise being:

  • A Request object
    • With an identical API:
      require('request-promise') == require('request')
      so to say
    • However, STREAMING THE RESPONSE (e.g.
      .pipe(...)
      ) is DISCOURAGED because Request-Promise would grow the memory footprint for large requests unnecessarily high. Use the original Request library for that. You can use both libraries in the same project.
  • Plus some methods on a request call object:
    • rp(...).then(...)
      or e.g.
      rp.post(...).then(...)
      which turn
      rp(...)
      and
      rp.post(...)
      into promises
    • rp(...).catch(...)
      or e.g.
      rp.del(...).catch(...)
      which is the same method as provided by Bluebird promises
      • Errors that the
        request
        library would pass to the callback are wrapped by
        request-promise
        and then passed to the catch handler. See code example below.
    • rp(...).finally(...)
      or e.g.
      rp.put(...).finally(...)
      which is the same method as provided by Bluebird promises
    • rp(...).cancel()
      or e.g.
      rp.get(...).cancel()
      which cancels the request
    • rp(...).promise()
      or e.g.
      rp.head(...).promise()
      which returns the underlying promise so you can access the full Bluebird API
  • Plus some additional options:
    • simple = true
      which is a boolean to set whether status codes other than 2xx should also reject the promise
    • resolveWithFullResponse = false
      which is a boolean to set whether the promise should be resolved with the full response or just the response body
    • transform
      which takes a function to transform the response into a custom value with which the promise is resolved
    • transform2xxOnly = false
      which is a boolean to set whether the transform function is applied to all responses or only to those with a 2xx status code

The objects returned by request calls like

rp(...)
or e.g.
rp.post(...)
are regular Promises/A+ compliant promises and can be assimilated by any compatible promise library.

The methods

.then(...)
,
.catch(...)
, and
.finally(...)
- which you can call on the request call objects - return a full-fledged Bluebird promise. That means you have the full Bluebird API available for further chaining. E.g.:
rp(...).then(...).spread(...)
If, however, you need a method other than
.then(...)
,
.catch(...)
, or
.finally(...)
to be FIRST in the chain, use
.promise()
:
rp(...).promise().bind(...).then(...)

.then(onFulfilled, onRejected)

// As a Request user you would write:
var request = require('request');

request('http://google.com', function (err, response, body) { if (err) { handleError({ error: err, response: response, ... }); } else if (!(/^2/.test('' + response.statusCode))) { // Status Codes other than 2xx handleError({ error: body, response: response, ... }); } else { process(body); } });

// As a Request-Promise user you can now write the equivalent code: var rp = require('request-promise');

rp('http://google.com') .then(process, handleError);

// The same is available for all http method shortcuts:
request.post('http://example.com/api', function (err, response, body) { ... });
rp.post('http://example.com/api').then(...);

.catch(onRejected)

rp('http://google.com')
    .catch(handleError);

// ... is syntactical sugar for:

rp('http://google.com') .then(null, handleError);

// However, this: rp('http://google.com') .then(process) .catch(handleError);

// ... is safer than: rp('http://google.com') .then(process, handleError);

For more info on

.then(process).catch(handleError)
versus
.then(process, handleError)
, see Bluebird docs on promise anti-patterns.

.finally(onFinished)

rp('http://google.com')
    .finally(function () {
        // This is called after the request finishes either successful or not successful.
    });

.cancel()

This method cancels the request using Bluebird's cancellation feature.

When

.cancel()
is called:
  • the promise will neither be resolved nor rejected and
  • the request is aborted.

.promise() - For advanced use cases

In order to not pollute the Request call objects with the methods of the underlying Bluebird promise, only

.then(...)
,
.catch(...)
, and
.finally(...)
were exposed to cover most use cases. The effect is that any methods of a Bluebird promise other than
.then(...)
,
.catch(...)
, or
.finally(...)
cannot be used as the FIRST method in the promise chain:
// This works:
rp('http://google.com').then(function () { ... });
rp('http://google.com').catch(function () { ... });

// This works as well since additional methods are only used AFTER the FIRST call in the chain: rp('http://google.com').then(function () { ... }).spread(function () { ... }); rp('http://google.com').catch(function () { ... }).error(function () { ... });

// Using additional methods as the FIRST call in the chain does not work: // rp('http://google.com').bind(this).then(function () { ... });

// Use .promise() in these cases: rp('http://google.com').promise().bind(this).then(function () { ... });

Fulfilled promises and the
resolveWithFullResponse
option

// Per default the body is passed to the fulfillment handler:
rp('http://google.com')
    .then(function (body) {
        // Process the html of the Google web page...
    });

// The resolveWithFullResponse options allows to pass the full response: rp({ uri: 'http://google.com', resolveWithFullResponse: true }) .then(function (response) { // Access response.statusCode, response.body etc. });

Rejected promises and the
simple
option

// The rejection handler is called with a reason object...
rp('http://google.com')
    .catch(function (reason) {
        // Handle failed request...
    });

// ... and would be equivalent to this Request-only implementation: var options = { uri: 'http://google.com' };

request(options, function (err, response, body) { var reason; if (err) { reason = { cause: err, error: err, options: options, response: response }; } else if (!(/^2/.test('' + response.statusCode))) { // Status Codes other than 2xx reason = { statusCode: response.statusCode, error: body, options: options, response: response }; }

if (reason) {
    // Handle failed request...
}

});

// If you pass the simple option as false... rp({ uri: 'http://google.com', simple: false }) .catch(function (reason) { // Handle failed request... });

// ... the equivalent Request-only code would be: request(options, function (err, response, body) { if (err) { var reason = { cause: err, error: err, options: options, response: response }; // Handle failed request... } }); // E.g. a 404 would now fulfill the promise. // Combine it with resolveWithFullResponse = true to check the status code in the fulfillment handler.

With version 0.4 the reason objects became Error objects with identical properties to ensure backwards compatibility. These new Error types allow targeted catch blocks:

var errors = require('request-promise/errors');

rp('http://google.com') .catch(errors.StatusCodeError, function (reason) { // The server responded with a status codes other than 2xx. // Check reason.statusCode }) .catch(errors.RequestError, function (reason) { // The request failed due to technical reasons. // reason.cause is the Error object Request would pass into a callback. });

The
transform
function

You can pass a function to

options.transform
to generate a custom fulfillment value when the promise gets resolved.
// Just for fun you could reverse the response body:
var options = {
    uri: 'http://google.com',
    transform: function (body, response, resolveWithFullResponse) {
        return body.split('').reverse().join('');
    }
};

rp(options) .then(function (reversedBody) { // ;D });

// However, you could also do something useful: var $ = require('cheerio'); // Basically jQuery for node.js

function autoParse(body, response, resolveWithFullResponse) { // FIXME: The content type string could contain additional values like the charset. // Consider using the content-type library for a robust comparison. if (response.headers['content-type'] === 'application/json') { return JSON.parse(body); } else if (response.headers['content-type'] === 'text/html') { return $.load(body); } else { return body; } }

options.transform = autoParse;

rp(options) .then(function (autoParsedBody) { // :) });

// You can go one step further and set the transform as the default: var rpap = rp.defaults({ transform: autoParse });

rpap('http://google.com') .then(function (autoParsedBody) { // :) });

rpap('http://echojs.com') .then(function (autoParsedBody) { // =) });

The third

resolveWithFullResponse
parameter of the transform function is equivalent to the option passed with the request. This allows to distinguish whether just the transformed body or the whole response shall be returned by the transform function:
function reverseBody(body, response, resolveWithFullResponse) {
    response.body = response.body.split('').reverse().join('');
    return resolveWithFullResponse ? response : response.body;
}

As of Request-Promise v3 the transform function is ALWAYS executed for non-2xx responses. When

options.simple
is set to
true
(default) then non-2xx responses are rejected with a
StatusCodeError
. In this case the error contains the transformed response:
var options = {
    uri: 'http://the-server.com/will-return/404',
    simple: true,
    transform: function (body, response, resolveWithFullResponse) { /* ... */ }
};

rp(options) .catch(errors.StatusCodeError, function (reason) { // reason.response is the transformed response });

You may set

options.transform2xxOnly = true
to only execute the transform function for responses with a 2xx status code. For other status codes – independent of any other settings, e.g.
options.simple
– the transform function is not executed.

Error handling

If the transform operation fails (throws an error) the request will be rejected with a

TransformError
:
var errors = require('request-promise/errors');

var options = { uri: 'http://google.com', transform: function (body, response, resolveWithFullResponse) { throw new Error('Transform failed!'); } };

rp(options) .catch(errors.TransformError, function (reason) { console.log(reason.cause.message); // => Transform failed! // reason.response is the original response for which the transform operation failed });

Experimental Support for Continuation Local Storage

Continuation Local Storage is no longer supported. However, you can get back the support by using

request-promise-any
.

Debugging

The ways to debug the operation of Request-Promise are the same as described for Request. These are:

  1. Launch the node process like
    NODE_DEBUG=request node script.js
    (
    lib,request,otherlib
    works too).
  2. Set
    require('request-promise').debug = true
    at any time (this does the same thing as #1).
  3. Use the request-debug module to view request and response headers and bodies. Instrument Request-Promise with
    require('request-debug')(rp);
    .

Mocking Request-Promise

Usually you want to mock the whole request function which is returned by

require('request-promise')
. This is not possible by using a mocking library like sinon.js alone. What you need is a library that ties into the module loader and makes sure that your mock is returned whenever the tested code is calling
require('request-promise')
. Mockery is one of such libraries.

@florianschmidt1994 kindly shared his solution: ```javascript before(function (done) {

var filename = "fileForResponse";
mockery.enable({
    warnOnReplace: false,
    warnOnUnregistered: false,
    useCleanCache: true
});

mockery.registerMock('request-promise', function () { var response = fs.readFileSync(__dirname + '/data/' + filename, 'utf8'); return Bluebird.resolve(response.trim()); });

done();

});

after(function (done) { mockery.disable(); mockery.deregisterAll(); done(); });

describe('custom test case', function () { // Test some function/module/... which uses request-promise // and it will always receive the predefined "fileForResponse" as data, e.g.: var rp = require('request-promise'); rp(...).then(function(data) { // ➞ data is what is in fileForResponse }); }); ```

Based on that you may now build a more sophisticated mock. Sinon.js may be of help as well.

Contributing

To set up your development environment:

  1. clone the repo to your desktop,
  2. in the shell
    cd
    to the main folder,
  3. hit
    npm install
    ,
  4. hit
    npm install gulp -g
    if you haven't installed gulp globally yet, and
  5. run
    gulp dev
    . (Or run
    node ./node_modules/.bin/gulp dev
    if you don't want to install gulp globally.)

gulp dev
watches all source files and if you save some changes it will lint the code and execute all tests. The test coverage report can be viewed from
./coverage/lcov-report/index.html
.

If you want to debug a test you should use

gulp test-without-coverage
to run all tests without obscuring the code by the test coverage instrumentation.

Change History

  • v4.2.6 (2020-07-21)
    • Security fix: bumped
      request-promise-core
      which bumps
      lodash
      to
      ^4.17.19
      following this advisory.
  • v4.2.5 (2019-11-03)
    • Security fix: bumped
      request-promise-core
      which bumps
      lodash
      to
      ^4.17.15
      . See vulnerabilty reports. (Thanks to @rishabh-chowdhary for reporting this in pull request #326.)
  • v4.2.4 (2019-02-14)
    • Corrected mistakenly set
      tough-cookie
      version, now
      ^2.3.3
      (Thanks to @evocateur for pointing this out.)
    • If you installed
      [email protected]
      please make sure after the upgrade that
      request
      and
      request-promise
      use the same physical copy of
      tough-cookie
      .
  • v4.2.3 (2019-02-14)
  • v4.2.2 (2017-09-22)
    • Upgraded
      tough-cookie
      to a version without regex DoS vulnerability (Thanks to @rouanw for pull request #226)
  • v4.2.1 (2017-05-07)
  • v4.2.0 (2017-03-16)
  • v4.1.1 (2016-08-08)
    • Renamed internally used package
      @request/promise-core
      to
      request-promise-core
      because there where too many issues with the scoped package name (Thanks to @cabrinoob, @crazy4groovy, @dsandor, @KpjComp, @lorenwest, @Reisyukaku, @tehChromic, @todd for providing helpful information.)
  • v4.1.0 (2016-07-30)
  • v4.0.2 (2016-07-18)
    • Fix for using with module bundlers like Webpack and Browserify
  • v4.0.1 (2016-07-17)
    • Fixed
      @request/promise-core
      version for safer versioning
  • v4.0.0 (2016-07-15)
    • Breaking Change:
      request
      is declared as a peer dependency which has to be installed separately by the user now
    • Breaking Change: Dropped support for Continuation Local Storage since
      request-promise-any
      can be used for that now
    • Introduced the
      transform2xxOnly
      option to ease the breaking change regarding the new
      transform
      handling in v3.0.0 (Thanks to @stevage for pointing out the effect of the breaking change in issue #131)
    • Resolved issues #65 and #71 by publishing nearly identical libraries to support other Promise implementations:
      request-promise-native
      and
      request-promise-any
      (Thanks to @benjamingr, @eilgin, @gillesdemey, @hildjj, @iggycoloma, @jonathanong, @knpwrs, @MarkHerhold, @massimocode, @mikeal, @niftylettuce, @raitucarp, @sherdeadlock, @tonylukasavage, and @vgoloviznin for the valuable discussions!)
    • Relicensed this library with the ISC license
  • v3.0.0 (2016-04-16)
    • Breaking Change: Overhauled the handling of the
      transform
      function (Thanks to @Limess for explaining the need in issue #86)
    • Breaking Change: Updated
      bluebird
      to v3 (Thanks to @BrandonSmith for pull request #103)
    • Improved
      StatusCodeError.message
    • Updated
      lodash
      to v4.6
    • Improved README in regard to
      .catch(...)
      best practice (Thanks to @RebootJeff for pull request #98)
  • v2.0.1 (2016-02-17)
  • v2.0.0 (2016-01-12)
    • Breaking Change: Removed explicit
      cls-bluebird
      dependency which has to be installed by the user now (Thanks to @hildjj for his pull request #75)
    • npm shrinkwrap
      now works for
      [email protected]
      users who don't use
      continuation-local-storage
      (Thanks to @toboid and @rstacruz for reporting the issue in issue #70 and issue #82)
  • v1.0.2 (2015-10-22)
    • Removed
      continuation-local-storage
      from peer dependencies as it was unnecessary (Thanks to @mrhyde for working on a better solution discussed in issue #70)
  • v1.0.1 (2015-10-14)
    • Fixed a npm warning by marking
      continuation-local-storage
      as a peer dependency
  • v1.0.0 (2015-10-11)
    • Breaking Change: Some errors that were previously thrown synchronously - e.g. for wrong input parameters - are now passed to the rejected promise instead (Thanks to @josnidhin for suggesting that in issue #43)
    • Breaking Change: Request-Promise does not load its own Bluebird prototype anymore. If you use Bluebird in your project and altered the prototype then Request-Promise may use your altered Bluebird prototype internally.
    • For HEAD requests the headers instead of an empty body is returned (unless
      resolveWithFullResponse = true
      is used) (Thanks to @zcei for proposing the change in issue #58)
    • Extended
      transform
      function by a third
      resolveWithFullResponse
      parameter
    • Added experimental support for continuation local storage (Thanks to @silverbp preparing this in issue #64)
    • Added node.js 4 to the Travis CI build
    • Updated the README (Thanks to many people for their feedback in issues #55 and #59)
  • v0.4.3 (2015-07-27)
    • Reduced overhead by just requiring used lodash functions instead of the whole lodash library (Thanks to @luanmuniz for pull request #54)
    • Updated dependencies
  • v0.4.2 (2015-04-12)
    • Updated dependencies
  • v0.4.1 (2015-03-20)
    • Improved Error types to work in browsers without v8 engine (Thanks to @nodiis for pull request #40)
  • v0.4.0 (2015-02-08)
    • Introduced Error types used for the reject reasons (See last part this section) (Thanks to @jakecraige for starting the discussion in issue #38)
    • Minor Breaking Change: The reject reason objects became actual Error objects. However,
      typeof reason === 'object'
      still holds true and the error objects have the same properties as the previous reason objects. If the reject handler only accesses the properties on the reason object - which is usually the case - no migration is required.
    • Added io.js and node.js 0.12 to the Travis CI build
  • v0.3.3 (2015-01-19)
    • Fixed handling possibly unhandled rejections to work with the latest version of Bluebird (Thanks to @slang800 for reporting this in issue #36)
  • v0.3.2 (2014-11-17)
    • Exposed
      .finally(...)
      to allow using it as the first method in the promise chain (Thanks to @hjpbarcelos for his pull request #28)
  • v0.3.1 (2014-11-11)
    • Added the
      .promise()
      method for advanced Bluebird API usage (Thanks to @devo-tox for his feedback in issue #27)
  • v0.3.0 (2014-11-10)
    • Carefully rewritten from scratch to make Request-Promise a drop-in replacement for Request

License (ISC)

In case you never heard about the ISC license it is functionally equivalent to the MIT license.

See the LICENSE file for details.

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