Monday, July 20, 2015

How JSONP enables cross-site request

In the previous post AngularJS Ajax using$http JSONP we saw on using JSONP to make cross-site requests, i.e the AnjularJS client and the service/API are located in different domains, by default browsers do not allow cross-site Ajax requests.

JSONP stands for JSON with padding, JSONP enables cross-site requests using the <script> tag, normal $http requests are sends server request URL as plain text, hence browsers reject the requests made to different domains, JSONP pads the requests within <script> tags and sends it to the server, browsers do not enforce same-origin validation for content in the <script> tag hence JSONP requests by-pass the validations and thereby enable us to make cross-site requests from the client to the server.

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