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Subject RE: Handling "Accept" and "Accept-Language" in query parameters
Date Mon, 18 Apr 2011 15:53:48 GMT
Was this patch part of release 2.4.0?  if not, is there a particular issue number I can track
for this?

From: Sergey Beryozkin []
Sent: Tuesday, April 12, 2011 12:53 PM
Subject: Re: Handling "Accept" and "Accept-Language" in query parameters

No, JsonpInInterceptor, with two out interceptors are utility interceptors that have been
added to the trunk as part of the patch.
Re your other questions, you can do


and that will override both Accept and Accept-Language, provided mappings are available.

I don't recall now, it was probably part of JAX-RS 0.8, for some reasons it did not make it
into the final spec, not sure why

Cheers, Sergey
On Tue, Apr 12, 2011 at 5:25 PM, KARR, DAVID (ATTSI) <<>>
Concerning the "JsonpInInterceptor", is this the class that you have a pending patch for?
 Assuming that's true, what is the issue that's addressed by the patch?

From: Sergey Beryozkin [<>]
Sent: Tuesday, April 12, 2011 8:24 AM

Subject: Re: Handling "Accept" and "Accept-Language" in query parameters


Perhaps JsonpInInterceptor [1] can be extended ? If you think it will help then may be you
can submit a small patch ?

But see also [2], you can use extension and language mappings to override Accept and Accept-Language

Cheers, Sergey

On Tue, Apr 12, 2011 at 4:54 AM, KARR, DAVID (ATTSI) <<>>
It was straightforward for me to write an additional interceptor to translate specific query
params to headers (A list property defined in Spring specifies the list of parameter names
to check for).  Is this basically what you meant by that?  Seems like this is something that
should be a reusable component.

From: Sergey Beryozkin [<>]
Sent: Friday, April 08, 2011 10:20 AM
Subject: Re: Handling "Accept" and "Accept-Language" in query parameters


Yes, it looks like a good idea. I'm also going to commit a JSONP patch shortly, and you will
be able to extend the inbound interceptor and update the Message headers as needed.

Message.QUERY_STRING key references the query itself, "HTTP_REQUEST" - HttpServletRequest
(you can check parameters or queries), Message.PROTOCOL_HEADERS - the map of headers

Thanks, Sergey
On Fri, Apr 8, 2011 at 4:16 PM, KARR, DAVID (ATTSI) <<>>
Just so it's clear, I'm talking about the fact that the "Accept" header, or any other HTTP
header, cannot be sent from a "script" block. The only choice we would have would be to send
query/request parameters.  I'm trying to figure out the cleanest way to enable use of query
parameters for functions usually specified by headers, without changing my controller, which
specifies the use of HTTP headers.

My current thought is to have an interceptor check for specific query parameters, perhaps
in a configurable map, and translate those to HTTP headers, and hopefully this can be done
before CXF makes decisions based on the presence of particular HTTP headers.

From: Sergey Beryozkin [<>]
Sent: Friday, April 08, 2011 3:44 AM
Subject: Re: Handling "Accept" and "Accept-Language" in query parameters

Hi David

I think I have to apply the JSONP patch that we have asap :-), and catch up a bit with the
way JSONP works.
I'm still not sure I follow, basically, looks like you'd like to have some utility code available
that can say take the value of Accept header and return a sorted list, yes ? If no then please
post an example with some pseudo code showing what are the actual expectations

Cheers, Sergey
On Thu, Apr 7, 2011 at 11:27 PM, KARR, DAVID (ATTSI) <<>>
Perhaps I wasn't clear.  The app currently checks for certain header parameters, along with
some query parameters.  In order to be fully usable from JSONP script tags, I'll have to get
it to work by using query parameters for what I'm currently using header parameters for. 
As to a format of the query parameters, that doesn't particularly matter.  If it's more workable
to have a bunch of former header parameters embedded into a single query parameter somehow,
I suppose that could work, if there was some reason that was more convenient than individual
query parameters.

From: Sergey Beryozkin [<>]
Sent: Thursday, April 07, 2011 2:57 PM
Subject: Re: Handling "Accept" and "Accept-Language" in query parameters


Can you explain a bit more how it works. Do you have individual query parameters representing
individual HTTP headers in this case ? Can you post a simple example ?

Cheers, Sergey
On Thu, Apr 7, 2011 at 10:45 PM, KARR, DAVID (ATTSI) <<>>
My CXF JAX-RS app currently looks at a couple of "standard" HTTP headers, being "Accept" and
"Accept-Language".  It also uses a custom HTTP header.

It's come to my attention that we need to examine whether we can support being called from
a "script" tag, to support JSONP callbacks.  This will not allow changing HTTP headers.  I
can easily enough change my code to check for my custom header as a query parameter instead
of an HTTP header, but the situation isn't as simple for "Accept" and "Accept-Language", which
are processed implicitly by CXF.

Presently handling of "Accept" is done without any effort on my part, except for perhaps the
"@Produces" annotation.  Handling of "Accept-Language" is done with almost as little effort,
requiring me to call the "HttpHeaders.getAcceptableLanguages()" function.

What are some reasonable strategies for getting this information (and using it, more importantly)
from request parameters instead?

Sergey Beryozkin

Application Integration Division of Talend<>

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