xhr

A small xhr wrapper

Example

var xhr = require("xhr")

xhr({
    body: someJSONString,
    uri: "/foo",
    headers: {
        "Content-Type": "application/json"
    }
}, function (err, resp, body) {
    // resp === xhr
    // check resp.body or resp.statusCode
})

var req = xhr(options, callback)

type XhrOptions = String | {
    cors: Boolean?,
    sync: Boolean?,
    uri: String,
    url: String,
    method: String?,
    timeout: Number?,
    headers: Object?,
    body: String?,
    json: Object?,
    withCredentials: Boolean?
}
xhr := (XhrOptions, Callback<Response>) => Request

the returned object is either an XMLHttpRequest instance or an XDomainRequest instance (if on IE8/IE9 && options.cors is set to true)

Your callback will be called once with the arguments ( Error, response , body ) where response is a response object containing { statusCode, body } and other properties of the XHR request and body will be either xhr.response, xhr.responseText or xhr.responseXML depending on the request type.

Your callback will be called with an Error if the resulting status of the request is either 0, 4xx or 5xx

If options is a string then it's a short hand for { method: "GET", uri: string }

options.method

Specify the method the XMLHttpRequest should be opened with. Passed to xhr.open. Defaults to "GET"

options.cors

Specify whether this is a cross domain request. Used in IE<10 to use XDomainRequest instead of XMLHttpRequest.

options.sync

Specify whether this is a synchrounous request. Note that when this is true the callback will be called synchronously. In most cases this option should not be used. Only use if you know what you are doing!

options.body

Pass in body to be send across the XMLHttpRequest. Generally should be a string. But anything that's valid as a parameter to xhr.send should work

options.uri or options.url

The uri to send a request too. Passed to xhr.open. options.url and options.uri are aliases for each other.

options.headers

An object of headers that should be set on the request. The key, value pair is passed to xhr.setRequestHeader

options.timeout

A numeric timeout to use for this xhr request. Defaults to 5 seconds. Ignored when options.sync is true.

options.json

A valid JSON serializable value to be send to the server. If this is set then we serialize the value and use that as the body. We also set the Content-Type to "application/json".

Additionally the response body is parsed as JSON

options.withCredentials

Specify whether user credentials are to be included in a cross-origin request. Sets xhr.withCredentials. Defaults to true when options.cors is true.

MIT Licenced