Re: Setting URLConnection User-Agent String

[warrell harries <wa...@gmail.com>]

Hi Chris,

It doesn't make any difference - it's plain old HTTP despite the jargon :)

If you have already seen this
http://www.mail-archive.com/users@cocoon.apache.org/msg34182.html

then investigate the original Generator code at
/cocoon-2.1.11/src/blocks/proxy/java/org/apache/cocoon/generation/WebServiceProxyGenerator.java

It could be that this will be sufficient for your requirements.

Best regards,

Warrell


On 28 February 2011 16:13, Christopher Schultz <chris@christopherschultz.net
> wrote:

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> Warrell,
>
> On 2/28/2011 6:41 AM, warrell harries wrote:
> > Please see recent discussion regarding proxying to another server. In
> > brief, I usually deploy a custom transformer based on the web service
> > proxy transformer but setting the user agent header before invoking the
> > web service.
>
> I was talking about a vanilla HTTP request that returns an XML document,
> not a formal web service. Not sure if that changes your suggestion(s).
>
> > Seems like this is a common requirement and it would be good if the
> > desired header could be passed in as a sitemap parameter to an existing
> > component. I am not aware of any existing component that provides this
> > facility.
>
> That would be cool. I've had a hard time penetrating the Cocoon code
> base in the past. Any pointers on where to look to possibly implement this?
>
> Thanks,
> - -chris
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Re: Setting URLConnection User-Agent String

[warrell harries <wa...@gmail.com>]

Yep, do it in the setup....

public void setup(SourceResolver resolver, Map objectModel, String src,
Parameters par) throws ProcessingException, SAXException, IOException
{
super.setup(resolver,objectModel,src,par);
try
{
Source inputSource = resolver.resolveURI(super.source);
this.source = inputSource.getURI();
}
catch(SourceException se)
{
throw SourceUtil.handle("Unable to Resolve " + super.source, se);
}
this.customHeader = par.getParameter(WORLD_LOGGER, new String());
this.httpClient = this.getHttpClient();
}

Re: Setting URLConnection User-Agent String

[Christopher Schultz <ch...@christopherschultz.net>]

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Warren,

Resurrecting an old thread: I hadn't noticed your reply back in March.

On 3/1/2011 5:46 AM, warrell harries wrote:
> It doesn't make any difference - it's plain old HTTP despite the
> jargon :)

Of course.

> If you have already seen this 
> http://www.mail-archive.com/users@cocoon.apache.org/msg34182.html
> 
> then investigate the original Generator code at 
> /cocoon-2.1.11/src/blocks/proxy/java/org/apache/cocoon/generation/WebServiceProxyGenerator.java
>
>  It could be that this will be sufficient for your requirements.

So, I'm using a simple XML-over-HTTP request as my generator, like this:

        <map:part src="http://host/service.xml" />

I'm using the default set of Cocoon generators with default="file", or
org.apache.cocoon.generation.FileGenerator. The request is definitely
using an HTTP connection, as this URL is not otherwise reachable (and
it's showing up in our request logs, too).

But, it's not a web service. Maybe that's not relevant, but I thought
I'd point it out as you directed me towards WebServiceProxyGenerator.java.

I took a look at how WSPG works, and it's a relatively straightforward
use of commons-httpclient, which has an addUserAgentRequestHeader
method available.

The question is how to get the setting from the sitemap into the
object that actually makes the connection.

Is the setup(..., Parameters par) method the right place to do such
things? If so, a simple patch like this:

if(par.isParameter("user-agent"))
  this.httpClient.getParams(HttpParam.USER_AGENT,
                            par.getParameter("user-agent"));

Would this be the right place to put such code, and how does one
configure parameters to <map:generator>? Using attributes like
<map:generator ... user-agent="MyUserAgent" /> or using sub-elements?

Thanks,
- -chris
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