$ npm install --save request
$ npm install --save retry-request
var request = require('retry-request', {
request: require('request')
});
It should work the same as 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 request
and provide it to this library:
var request = require('retry-request', {
request: require('request')
});
The code will actually look for the request
module automatically to save you this step. But, being explicit like in the example is also welcome.
Callback
urlThatReturns503
will be requested 3 total times before giving up and executing the callback.
request(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.
request(urlThatReturns503)
.on('error', function () {})
.on('response', function () {})
.on('complete', function () {});
Can I monitor what retry-request is doing internally?
Yes! This project uses debug to provide the current retry attempt, each response status, and the delay computed until the next retry attempt is made. 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
. See the list of options supported: https://github.com/request/request/#requestoptions-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.
var opts = {
noResponseRetries: 0
};
request(url, opts, function (err, resp, body) {
});
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
var opts = {
retries: 4
};
request(urlThatReturns503, opts, function (err, resp, body) {
});
opts.currentRetryAttempt
Type: Number
Default: 0
var opts = {
currentRetryAttempt: 1
};
request(urlThatReturns503, opts, function (err, resp, body) {
});
opts.shouldRetryFn
Type: Function
Default: Returns true
if http.incomingMessage.statusCode is < 200 or >= 400.
var opts = {
shouldRetryFn: function (incomingHttpMessage) {
return incomingHttpMessage.statusMessage !== 'OK';
}
};
request(urlThatReturnsNonOKStatusMessage, opts, function (err, resp, body) {
});
opts.request
Type: Function
Default: try { require('request') }
If we cannot locate request
, we will throw an error advising you to provide it explicitly.
NOTE: If you override the request function, and it returns a stream in object mode, be sure to set opts.objectMode
to true
.
var originalRequest = require('request').defaults({
pool: {
maxSockets: Infinity
}
});
var opts = {
request: originalRequest
};
request(urlThatReturns503, opts, function (err, resp, body) {
});
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.