AJAX-XMLHttpRequest Part1

I'm totally new to AJAX technology.Since I got an AJAX related task on my job,I had to carry out a research on it and get a clear understanding on it.Following is the knowledge I gained from that research.

Before talking about XMLHttpRequest, I'll describe what is AJAX.
Ajax (Asynchronous Javascript And XML) is a technique to submit server requests and return information from the server to the user without the necessity of waiting for a page load.

An Ajax script makes a request of a server by using the Javascript XMLHTTPRequest object,instead of using a a normal HTTP POST or GET request.XMLHTTPRequest retrieves information from the server in an invisible manner without using a page refresh.
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Convert an InputStream to XML

For that we can use DocumentBuilder class in java. By using the method parse(InputStream) ; A new DOM Document object will return. InputStream input; DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); DocumentBuilder parser = factory.newDocumentBuilder(); Document dc= parser.parse(input); In the above code segment,by using the created Document object,the corresponding XML file for the inputStream can be accessed. References: http://www.w3schools.com/dom/dom_intro.asp http:// download.oracle.com/javase/1.4.2/docs/api/javax/xml/parsers/DocumentBuilder.html

Concat two xml values with XSLT

The use-case described in this blog-post,is there's an WSO2 ESB node setup to proxy an incoming message to a particular back-end endpoint. Before delivering the message to the back-end endpoint,from the ESB node itself,this incoming message need to processed and change its inside xml payload format. For eg: Below is the incoming message <?xml version="1.0" encoding="UTF-8"?> <CinemaHall name="liberty"> <OwnerData> <Name>John Smith</Name> <openedDate>12/12/80</openedDate> <quality>good</quality> </OwnerData> <CinemaHallData> <rows>100</rows> <seats> <seat>50</seat> <seat>60</seat> </seats> </CinemaHallData> </CinemaHall> This message need to be changed as below; <?xml version="1.0" encoding="UTF-8"?> <CinemaHall name="liberty">

Passing end-user details from client to real backend endpoint via JWT token

In real-world business system,WSO2 API Manager useful on exposing company APIs, in a secured and controlled manner with the features provided by APIManager as; OAuth support [To secure API invocations] Throttling support [To control API invocations] Monitoring support [To track API usage] More technically what happening is when a user sends a particular API request,it will goes to WSO2 APIManager node and from there,the request will route to the real implemented back-end endpoint of the particular API and get back the response and returned it to the API invoked user. There can be a use-case,that this back-end endpoint may expect the details of API invoked user as to pass those details to some internal company usage as; Additional authentication/authorization Track usage data from an internal system. So how to support above requirement from WSO2 AM. There comes the use of JSON Web Token[JWT] implementation done inside WSO2 AM. JWT is a means of representing claims to be

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