Request input stream

[yann luppo]

Hi everyone,

I'm having a small issue trying to grab a parameter value from a request. I thought it would just as easy as doing request.getParameter("parameter"); but it isn't in this case.
The parameter I'm looking for is stored in the input stream, I've actually iterated through the request inputstream and found the value there, but it's not in the request parameters. To confirm that it's not in there, I've iterated through the request.getParameters() Enumerable.

The input control is a dropdown list on a jsp page. Every time the user changes the selection in that dropdown list the page executes a post back to retrieve the new data to display.

We use Spring security and other Spring features in what I'll call our "Front" web application. The web app is actually more of a multi-tier app when that specific page is reached, because every time the value gets changed in the dropdown list, we really intercept the request in our Front web app and transfer the request to another web farm to get the response object back, well formatted with the appropriate data. In some ways the "Front" web app is behaving like a proxy.

I tried to read the input stream to extract that value, but it messes up the request being proxied to the other web farm. It looks like the input stream cannot be opened anymore after that.

Anyone would have any idea on how to proceed on that one?

Thanks,
Yann

[Bear Bibeault]

yann luppo wrote:I'm having a small issue trying to grab a parameter value from a request. I thought it would just as easy as doing request.getParameter("parameter"); but it isn't in this case.

Actually, it is that easy unless you've mucked around with the form's enctype (usually done to allow file uploading as a multi-part request).

You shouldn't have to screw around with the input stream yourself. Is there some aspect of this that you are leaving out?

[yann luppo]

Hi Bear,

Well I haven't worked on the jsp page myself so I can't say for sure what the encoding type is, but I will check now and let you know.

Yann.

[yann luppo]

Bear Bibeault wrote:

yann luppo wrote:I'm having a small issue trying to grab a parameter value from a request. I thought it would just as easy as doing request.getParameter("parameter"); but it isn't in this case.

Actually, it is that easy unless you've mucked around with the form's enctype (usually done to allow file uploading as a multi-part request).

You shouldn't have to screw around with the input stream yourself. Is there some aspect of this that you are leaving out?

The request content type is:

"request.getContentType()"= "text/plain; charset=UTF-8"

Is that the correct value or should it be: "application/x-www-form-urlencoded" ?

Oh and if that helps any the request I'm looking at is actually a DWR call.

Thanks for your help.

[Ashwin Pai]

Yes the content type is correct.. By the way the the list is single select (dropdown) and not multiselect .. correct?

Ashwin

[Bear Bibeault]

The enctype of the form, if specified, is of interest.

[Gamini Sirisena]

Hi Yann and all,
Just a silly suggestion. I did read that you read the InputStream, but, you have verified the parameter name is given for the name attribute of the control?

[yann luppo]

Ashwin Pai wrote:Yes the content type is correct.. By the way the the list is single select (dropdown) and not multiselect .. correct?

Ashwin

That's correct it's single select.

[yann luppo]

Bear Bibeault wrote:The enctype of the form, if specified, is of interest.

Silly question... but how do I figure out the enctype?

[yann luppo]

Gamini Sirisena wrote:Hi Yann and all,
Just a silly suggestion. I did read that you read the InputStream, but, you have verified the parameter name is given for the name attribute of the control?

Well here is the control definition once rendered:

<select id="carFilter" name="report-view">
<option value="both">Cars & Motorcycles</option>
<option value="cars">Cars only</option>
<option value="motorcycles">Motorcycles only</option>
</select>

And using firebug I am able to see the post data, line 8 is my parameter defined like this:

c0-param1=string:cars

[Bauke Scholtz]

In the inputstream of the request or with some http request debugging tool in the webbrowser.

[yann luppo]

Bauke Scholtz wrote:In the inputstream of the request or with some http request debugging tool in the webbrowser.

Here is the content of the http header according to Firebug:

RESPONSE HEADERS

Server                                     Apache-Coyote/1.1
Content-Type                               text/javascript;charset=utf-8
Content-Length                             6347
Date                                       Wed, 21 Jan 2009 17:53:18 GMT

REQUEST HEADERS

Host	                                   localhost:8080
User-Agent	                               Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.5; .NET CLR 3.5; ffco7) Gecko/2008120122 Firefox /3.0.5
Accept	                                   text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language	                           en-us,en;q=0.5
Accept-Encoding	                           gzip,deflate
Accept-Charset	                           ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive	                               300
Connection	                               keep-alive
Content-Type	                           text/plain; charset=UTF-8
Referer	                                   http://localhost:8080/test/detail.html
Content-Length	                           282
Cookie	                                   JSESSIONID=7883DC0EBBA4555B2126915D6B9317B1
Pragma	                                   no-cache
Cache-Control	                           no-cache

[Bauke Scholtz]

With the inputstream of the request I mean the request body, not the request headers.

[yann luppo]

Bauke Scholtz wrote:With the inputstream of the request I mean the request body, not the request headers.

Is it possible that DWR actually modifies the encoding of the inpustream? I believe it serializes the parameters which seems to me like it's modifying to some extent the inputstream format. Any idea if that's true or not and if it is how to go about that?

Thanks,
Yann