THIS REPOSITORY AND PACKAGE WILL BE DEPRECATED IN JULY 2024. RELEVANT FUNCTIONALITIES HAVE BEEN MOVED TO GOOGLEAPIS/GAXIOS

Retry a request with built-in exponential backoff.

1$ npm install --save teeny-request
2$ npm install --save retry-request

1var request = require('retry-request', {
2  request: require('teeny-request'),
3});

It should work the same as request and teeny-request in both callback mode and stream mode.

Note: This module only works when used as a readable stream, i.e. POST requests aren't supported (#3).

Do I need to install request?

Yes! You must independently install teeny-request OR request (deprecated) and provide it to this library:

1var request = require('retry-request', {
2  request: require('teeny-request'),
3});

Callback

urlThatReturns503 will be requested 3 total times before giving up and executing the callback.

1request(urlThatReturns503, function (err, resp, body) {});

Stream

urlThatReturns503 will be requested 3 total times before giving up and emitting the response and complete event as usual.

1request(urlThatReturns503)
2  .on('error', function () {})
3  .on('response', function () {})
4  .on('complete', function () {});

Can I monitor what retry-request is doing internally?

Yes! To enable the debug mode, set the environment variable DEBUG to retry-request.

(Thanks for the implementation, @yihaozhadan!)

request(requestOptions, [opts], [cb])

requestOptions

Passed directly to request or teeny-request. See the list of options supported:

• https://github.com/request/request/#requestoptions-callback
• https://github.com/googleapis/teeny-request#teenyrequestoptions-callback

opts (optional)

opts.noResponseRetries

Type: Number

Default: 2

The number of times to retry after a response fails to come through, such as a DNS resolution error or a socket hangup.

1var opts = {
2  noResponseRetries: 0,
3};
4
5request(url, opts, function (err, resp, body) {
6  // url was requested 1 time before giving up and
7  // executing this callback.
8});

opts.objectMode

Type: Boolean

Default: false

Set to true if your custom opts.request function returns a stream in object mode.

opts.retries

Type: Number

Default: 2

1var opts = {
2  retries: 4,
3};
4
5request(urlThatReturns503, opts, function (err, resp, body) {
6  // urlThatReturns503 was requested a total of 5 times
7  // before giving up and executing this callback.
8});

opts.currentRetryAttempt

Type: Number

Default: 0

1var opts = {
2  currentRetryAttempt: 1,
3};
4
5request(urlThatReturns503, opts, function (err, resp, body) {
6  // urlThatReturns503 was requested as if it already failed once.
7});

opts.shouldRetryFn

Type: Function

Default: Returns true if http.incomingMessage.statusCode is < 200 or >= 400.

1var opts = {
2  shouldRetryFn: function (incomingHttpMessage) {
3    return incomingHttpMessage.statusMessage !== 'OK';
4  },
5};
6
7request(urlThatReturnsNonOKStatusMessage, opts, function (err, resp, body) {
8  // urlThatReturnsNonOKStatusMessage was requested a
9  // total of 3 times, each time using `opts.shouldRetryFn`
10  // to decide if it should continue before giving up and
11  // executing this callback.
12});

opts.request

Type: Function

If we not provided we will throw an error advising you to provide it.

NOTE: If you override the request function, and it returns a stream in object mode, be sure to set opts.objectMode to true.

1var originalRequest = require('teeny-request').defaults({
2  pool: {
3    maxSockets: Infinity,
4  },
5});
6
7var opts = {
8  request: originalRequest,
9};
10
11request(urlThatReturns503, opts, function (err, resp, body) {
12  // Your provided `originalRequest` instance was used.
13});

opts.maxRetryDelay

Type: Number

Default: 64

The maximum time to delay in seconds. If retryDelayMultiplier results in a delay greater than maxRetryDelay, retries should delay by maxRetryDelay seconds instead.

opts.retryDelayMultiplier

Type: Number

Default: 2

The multiplier by which to increase the delay time between the completion of failed requests, and the initiation of the subsequent retrying request.

opts.totalTimeout

Type: Number

Default: 600

The length of time to keep retrying in seconds. The last sleep period will be shortened as necessary, so that the last retry runs at deadline (and not considerably beyond it). The total time starting from when the initial request is sent, after which an error will be returned, regardless of the retrying attempts made meanwhile.

cb (optional)

Passed directly to request. See the callback section: https://github.com/request/request/#requestoptions-callback.