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Showing content from https://webplatform.github.io/docs/apis/xhr/XMLHttpRequest/open below:

open · WebPlatform Docs

Initializes an XMLHttpRequest.

Method of apis/xhr/XMLHttpRequestapis/xhr/XMLHttpRequest

 object.open(method, url, async, user, password);

Data-type

String

Specifies the HTTP method used to open the connection, such as GET, POST, or HEAD. This parameter is not case-sensitive.

Data-type

String

Specifies either an absolute or relative URL of the XML data or server-side Web services.

Data-type

Boolean

(Optional)

Specifies true for asynchronous operation (the call returns immediately), or false for synchronous operation. If true, assign a callback handler to the onreadystatechange property to determine when the call has completed. If not specified, the default is true.

Data-type

String

(Optional)

Specifies the name of the user for authentication. If this parameter is null or not specified and the site requires authentication, the browser displays a logon window.

Data-type

String

(Optional)

Specifies the password for authentication. This parameter is ignored if the user parameter is null or not specified.

No return value

The following script demonstrates how to create and use the XMLHttpRequest object. For best client-side performance, the request is asynchronous and uses an onreadystatechange event handler to process the data returned by the call.

function handler() {
  if (xhr.readyState === 4 ) {
    if (xhr.status === 200) {
            console.log(xhr.responseText);
        }
    }
}
var xhr = new XMLHttpRequest();
xhr.open("GET", "http://localhost/test.xml", true);
xhr.onreadystatechange = handler;
xhr.send();

The following HTTP verbs and World Wide Web Distributed Authoring and Versioning (WebDAV) methods are supported:

Internet Explorer caches the results of HTTP GET requests in the Temporary Internet Files (TIF) folder. In most cases, caching improves performance for data that will not change frequently. To guarantee that the results are not cached, use POST. **Security Warning: ** Cross-domain, cross-port, and mixed protocol requests are not allowed. The bstrUrl parameter may only specify files in the same domain, using the same port and protocol method, as that from which the page is served. Although this method accepts credentials passed via parameter, those credentials are not automatically sent to the server on the first request. The varUser and varPassword parameters are not transmitted unless the server challenges the client for credentials with a 401 - Access Denied response. After calling this method, use send to send the request and data, if any, to the server.

W3C XMLHttpRequest Specification

W3C Working Draft

• Microsoft Developer Network: Windows Internet Explorer API reference Article

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