XMLHTTP Question

[bboyle18@gmail.com]

Hi,

I've been looking into the possibility of using XMLHTTP for my
enterprise application but I still have a question.

When you send the request to the server, how does the server know how
to handle the request? (i.e. how do I specify what method to call in my
java servlet?)

I'd appreciate any help on this.....I've only got a vaey basic
knowledge of javascript and I am fluent in java.

Thanks,

B

[The Mighty Krell]

Re: XMLHTTP Question


Treat it as you would any other URL.

MK


<bboyle18@gmail .com> wrote in message
news:1109032286 .312504.169410@ c13g2000cwb.goo glegroups.com.. .[color=blue]
> Hi,
>
> I've been looking into the possibility of using XMLHTTP for my
> enterprise application but I still have a question.
>
> When you send the request to the server, how does the server know how
> to handle the request? (i.e. how do I specify what method to call in my
> java servlet?)
>
> I'd appreciate any help on this.....I've only got a vaey basic
> knowledge of javascript and I am fluent in java.
>
> Thanks,
>
> B
>[/color]

[Martin Honnen]

Re: XMLHTTP Question



bboyle18@gmail. com wrote:

[color=blue]
> I've been looking into the possibility of using XMLHTTP for my
> enterprise application but I still have a question.
>
> When you send the request to the server, how does the server know how
> to handle the request? (i.e. how do I specify what method to call in my
> java servlet?)[/color]

The request is simply a HTTP request, for instance a GET request, a
servlet then knows how to treat a HTTP GET request and the servlet
container I think provides an API to read the query string. Similar if a
HTTP POST request is send I think a servlet has a method to process such
requests and read out the body of the POST request.
So on the client you need to decide about the URL of the servlet, about
the HTTP request method (e.g. GET, POST etc) and then make the request e.g.
var httpRequest = new XMLHttpRequest( );
httpRequest.ope n('GET', 'servletURL', true);
// now set request header if needed
httpRequest.onr eadystatechange = function () {
// handle response here e.g.
if (httpRequest.re adyState == 4) {
..
}
};
httpRequest.sen d(null);
or
var httpRequest = new XMLHttpRequest( );
httpRequest.ope n('POST', 'servletURL', true);
// now set request header if needed
httpRequest.set RequestHeader(' Content-Type',
'application/x-www-form-urlencoded');
httpRequest.onr eadystatechange = function () {
// handle response here e.g.
if (httpRequest.re adyState == 4) {
..
}
};
httpRequest.sen d('a=1&b=2');

A HTTP request doesn't call particular methods on the server, for that
you would need to look into webservices, IE/Win with the webservice
behavior and Mozilla with its webservice proxying API allow that but of
course then you also need to implement a web service on the server.

--

Martin Honnen

http://JavaScript.FAQTs.com/

[Mr.Clean]

Re: XMLHTTP Question

<SNIP>[color=blue]
> A HTTP request doesn't call particular methods on the server, for that
> you would need to look into webservices, IE/Win with the webservice
> behavior and Mozilla with its webservice proxying API allow that but of
> course then you also need to implement a web service on the server.
>
>[/color]

On the other hand, XMLHTTP CAN call specific "functions" , or verbs on
the server. Take, for instance the WebDAV implementation of Hotmail, in
the WebDAV specs, there are no mentions of BPROPPATCH, BDELETE, BMOVE,
verbs, etc. However, you can call them using XMLHTTP on their WebDAV
implementation.

It really depends on how your server is written.

[Martin Honnen]

Re: XMLHTTP Question



Mr.Clean wrote:

[color=blue][color=green]
>>A HTTP request doesn't call particular methods on the server, for that
>>you would need to look into webservices, IE/Win with the webservice
>>behavior and Mozilla with its webservice proxying API allow that but of
>>course then you also need to implement a web service on the server.
>>[/color]
>
> On the other hand, XMLHTTP CAN call specific "functions" , or verbs on
> the server. Take, for instance the WebDAV implementation of Hotmail, in
> the WebDAV specs, there are no mentions of BPROPPATCH, BDELETE, BMOVE,
> verbs, etc. However, you can call them using XMLHTTP on their WebDAV
> implementation.
>[/color]

Other protocols can certainly be implemented on top of HTTP or using
HTTP as the transport, for instance a web service client and a web
service server usually communicate by exchanging SOAP messages over HTTP
and for instance the MS web service behavior is implemented with the
help of Microsoft.XMLHT TP.

But the original poster asked about XMLHTTP and servlet communication,
that looks more like doing a certain HTTP request (e.g. GET, POST) on
the client and processing that with the servlet as something that
receives HTTP requests and sends a HTTP response.

--

Martin Honnen

http://JavaScript.FAQTs.com/

[Mr.Clean]

Re: XMLHTTP Question

In article <421b514f$0$249 46$9b4e6d93@new sread2.arcor-online.net>,
mahotrash@yahoo .de says...[color=blue]
>
>
> Mr.Clean wrote:
>
>[color=green][color=darkred]
> >>A HTTP request doesn't call particular methods on the server, for that
> >>you would need to look into webservices, IE/Win with the webservice
> >>behavior and Mozilla with its webservice proxying API allow that but of
> >>course then you also need to implement a web service on the server.
> >>[/color]
> >
> > On the other hand, XMLHTTP CAN call specific "functions" , or verbs on
> > the server. Take, for instance the WebDAV implementation of Hotmail, in
> > the WebDAV specs, there are no mentions of BPROPPATCH, BDELETE, BMOVE,
> > verbs, etc. However, you can call them using XMLHTTP on their WebDAV
> > implementation.
> >[/color]
>
> Other protocols can certainly be implemented on top of HTTP or using
> HTTP as the transport, for instance a web service client and a web
> service server usually communicate by exchanging SOAP messages over HTTP
> and for instance the MS web service behavior is implemented with the
> help of Microsoft.XMLHT TP.
>
> But the original poster asked about XMLHTTP and servlet communication,
> that looks more like doing a certain HTTP request (e.g. GET, POST) on
> the client and processing that with the servlet as something that
> receives HTTP requests and sends a HTTP response.
>
>[/color]


XMLRPC can be achieved using XMLHTTP and just POST and GET. That is how
SOAP is implemented, correct?