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From "Xinjun Chen" <xjchen...@gmail.com>
Subject Re: Problem with a router servlet - end client cannot get response
Date Tue, 22 Aug 2006 13:29:15 GMT
Hi Roland,

Thank you for your previous help. I have already fixed the previous
problems. But they are not actual cause of the problem. As I said,
some services are ok, some are not. Finally it turns out that it is
because I didn't set proxy.


Regards,
Xinjun


On 8/11/06, Roland Weber <http-async@dubioso.net> wrote:
> Hello Xinjun,
>
> I suggest you take a long, good, in-depth look at RFC 2616:
> http://www.ietf.org/rfc/rfc2616.txt
> There are PDF versions on the web if you prefer that.
> In particular, you should study *everything* the RFC says
> about proxies, because that's what your "router" is. And
> there is a whole lot about proxies, including information
> on which header fields must be passed through by a proxy
> and which ones are strictly link-to-link and MUST NOT be
> passed on to the next server. Once you've done that, fix
> the following part of your code:
>
> > Enumeration headerNames = request.getHeaderNames();
> > while (headerNames.hasMoreElements()) {
> >    String name = (String) headerNames.nextElement();
> >    Enumeration values = request.getHeaders(name);
> >    while(values.hasMoreElements()) {
> >        String value = (String) values.nextElement();
> >        log.debug(name + ":" + value + "\n");
> >        method.addRequestHeader(name, value);
> >    }
> >}
>
> and also this:
>
> > Header[] headers = method.getResponseHeaders();
> >    int headerSize = headers.length;
> >    for (int i = 0; i < headerSize; i++) {
> >        log.debug(headers[i].getName() + ":-" + headers[i].getValue());
> >        response.addHeader(headers[i].getName(), headers[i].getValue());
> >    }
>
> The following part is questionable, since one of the headers
> usually specifies which footers are to expect, and turning
> footers into header could make the request invalid:
>
> >    Header[] footers = method.getResponseFooters();
> >    int footerSize = footers.length;
> >    for (int i = 0; i < footerSize; i++) {
> >        log.debug(footers[i].getName() + ":-" + footers[i].getValue());
> >        response.setHeader(footers[i].getName(), footers[i].getValue());
> >    }
>
> On the other hand, it shouldn't matter. You're trying to access
> the footers before receiving the message body, so they aren't
> yet available anyway.
>
> cheers,
>   Roland
>
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