HTTP Headers from URL generator (or other processor)

> Is there any way of retrieving HTTP response headers from a request made
> by the URL generator (or any other processor that might do the job)?
>  
> eg being able to get
> - the response code
> - the content-type
>  
> Ideally ability to customise the request also, eg to do an HTTP HEAD and
> then examine the resulting response headers.
>  
> If there's nothing that will do the job currently, any hints on where to
> start to write such a thing would be great!
>  
> Steve

> Steve,
>
> I can't think of any way to get response header information from the  
> URL generator, but maybe someone else can help with that.
>
> If you want/need to do it yourself, though, it's not that hard.  
> Start here for information on how to write a processor:
>
> http://www.orbeon.com/ops/doc/reference-processor-api
>
> I've used Apache HTTPClient to build a specialized URL-generator-
> like processor specifically because it offers a lot of ways to  
> tinker with the request and the response.
>
> http://hc.apache.org/httpclient-3.x/
>
> In my case, I'm always retrieving XML, so I use Dom4J to very easily  
> parse the returned document:
>
> import java.xml.transform.Source;
> import org.dom4j.Document;
> import org.apache.commons.httpclient.methods.GetMethod;
> import org.dom4j.io.SAXReader;
> import org.orbeon.oxf.xml.dom4j.Dom4jUtils;
>
> public static Document getDoc(String url, /* other stuff */) {
>    SAXReader reader = new SAXReader(false); // don't validate
>    GetMethod m = new GetMethod(url);
>    InputStream is = method.getResponseBodyAsStream();
>    Document content = reader.read(is);
>    return content;
>
>    /* if you need to return a Source instead, there's a handy
>       utility class to help with that:
>    return Dom4jUtils.getDocumentSource(content);
>    */
> }
>
> Your processor's generateXXXX() method (whatever you choose to call  
> your output) can then use an org.dom4j.io.SAXWriter to write the  
> document out into the ContentHandler that is passed in.
>
> I hope this helps, and I hope that anyone who can offer a better way  
> will share that with the list too.
>
> </Jeff>
>
>
> Steve Bayliss wrote:
>> Is there any way of retrieving HTTP response headers from a request  
>> made by the URL generator (or any other processor that might do the  
>> job)?
>> eg being able to get
>> - the response code
>> - the content-type
>> Ideally ability to customise the request also, eg to do an HTTP  
>> HEAD and then examine the resulting response headers.
>> If there's nothing that will do the job currently, any hints on  
>> where to start to write such a thing would be great!
>> Steve
>
> --
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> Steve,
>
> I can't think of any way to get response header information from the
> URL generator, but maybe someone else can help with that.
>
> If you want/need to do it yourself, though, it's not that hard.
> Start here for information on how to write a processor:
>
> http://www.orbeon.com/ops/doc/reference-processor-api
>
> I've used Apache HTTPClient to build a specialized URL-generator-
> like processor specifically because it offers a lot of ways to  
> tinker with the request and the response.
>
> http://hc.apache.org/httpclient-3.x/
>
> In my case, I'm always retrieving XML, so I use Dom4J to very easily
> parse the returned document:
>
> import java.xml.transform.Source;
> import org.dom4j.Document;
> import org.apache.commons.httpclient.methods.GetMethod;
> import org.dom4j.io.SAXReader;
> import org.orbeon.oxf.xml.dom4j.Dom4jUtils;
>
> public static Document getDoc(String url, /* other stuff */) {
>    SAXReader reader = new SAXReader(false); // don't validate
>    GetMethod m = new GetMethod(url);
>    InputStream is = method.getResponseBodyAsStream();
>    Document content = reader.read(is);
>    return content;
>
>    /* if you need to return a Source instead, there's a handy
>       utility class to help with that:
>    return Dom4jUtils.getDocumentSource(content);
>    */
> }
>
> Your processor's generateXXXX() method (whatever you choose to call
> your output) can then use an org.dom4j.io.SAXWriter to write the  
> document out into the ContentHandler that is passed in.
>
> I hope this helps, and I hope that anyone who can offer a better way
> will share that with the list too.
>
> </Jeff>
>
>
> Steve Bayliss wrote:
>> Is there any way of retrieving HTTP response headers from a request
>> made by the URL generator (or any other processor that might do the  
>> job)?
>> eg being able to get
>> - the response code
>> - the content-type
>> Ideally ability to customise the request also, eg to do an HTTP  
>> HEAD and then examine the resulting response headers.
>> If there's nothing that will do the job currently, any hints on  
>> where to start to write such a thing would be great!
>> Steve
>
> --
> You receive this message as a subscriber of the [hidden email]
> mailing list.
> To unsubscribe: mailto:[hidden email]
> For general help: mailto:[hidden email]?subject=help
> OW2 mailing lists service home page: http://www.ow2.org/wws