then-request

then-request

A request library that returns promises, inspired by request

Installation

npm install then-request

Usage

request(method, url, options, callback?)

e.g.

var request = require('then-request');

request('GET', 'http://example.com').done(function (res) {
  console.log(res.getBody());
});

Method:

An HTTP method (e.g. GET, POST, PUT, DELETE or HEAD). It is not case sensitive.

URL:

A url as a string (e.g. http://example.com). Relative URLs are allowed in the browser.

Options:

• qs - an object containing querystring values to be appended to the uri
• headers - http headers (default: {})
• body - body for PATCH, POST and PUT requests. Must be a Buffer or String (only strings are accepted client side)
• json - sets body but to JSON representation of value and adds Content-type: application/json. Does not have any affect on how the response is treated.
• cache - only used in node.js (browsers already have their own caches) Can be 'memory', 'file' or your own custom implementaton (see https://github.com/ForbesLindesay/http-basic#implementing-a-cache).
• followRedirects - defaults to true but can be explicitly set to false on node.js to prevent then-request following redirects automatically.
• maxRedirects - sets the maximum number of redirects to follow before erroring on node.js (default: Infinity)
• gzip - defaults to true but can be explicitly set to false on node.js to prevent then-request automatically supporting the gzip encoding on responses.
• timeout (default: false) - times out if no response is returned within the given number of milliseconds.
• socketTimeout (default: false) - calls req.setTimeout internally which causes the request to timeout if no new data is seen for the given number of milliseconds. This option is ignored in the browser.
• retry (default: false) - retry GET requests. Set this to true to retry when the request errors or returns a status code greater than or equal to 400 (can also be a function that takes (err, req, attemptNo) => shouldRetry)
• retryDelay (default: 200) - the delay between retries (can also be set to a function that takes (err, res, attemptNo) => delay)
• maxRetries (default: 5) - the number of times to retry before giving up.

Callback / Returns:

If a callback is provided it is called with err and res. If no callback is provided, a Promise is returned that eventually resolves to res. The resulting Promise also has an additional .getBody(encoding?) method that is equivallent to calling .then(function (res) { return res.getBody(encoding?); }).

Response

Note that even for status codes that represent an error, the promise will be resolved as the request succeeded. You can call getBody if you want to error on invalid status codes. The response has the following properties:

• statusCode - a number representing the HTTP status code
• headers - http response headers
• body - a string if in the browser or a buffer if on the server
• url - the URL that was requested (in the case of redirects on the server, this is the final url that was requested)

It also has a method getBody(encoding?) which looks like:

function getBody(encoding) {
  if (this.statusCode >= 300) {
    var err = new Error('Server responded with status code ' + this.statusCode + ':\n' + this.body.toString(encoding));
    err.statusCode = this.statusCode;
    err.headers = this.headers;
    err.body = this.body;
    throw err;
  }
  return encoding ? this.body.toString(encoding) : this.body;
}

License

MIT