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From: Ben Cox <ben_cox_21@hotmail.com>
To: <httpclient-users@hc.apache.org>
Subject: RE: HTTP Trailers in HttpClient 4.0.1
Date: Wed, 3 Feb 2010 11:49:26 +0000
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Oleg=2C

Thanks for your response. That's interesting - as you say=2C using trailers=
 is somewhat of an edge case=2C though there's something to be said for usi=
ng them as part of mashup-type applications in which data may be being sent=
 over an extended period=2C so some state may be unknown at the beginning o=
f transmission.

I'd spotted the ChunkedInputStream before=2C but was unable to use it. Whic=
h InputStream are you referring to? I tried casting entity.getContent()=2C =
but that's a ByteArrayInputStream=2C and I can't find an InputStream for th=
e response itself.

Thanks=2C
Ben


----------------------------------------
> Subject: Re: HTTP Trailers in HttpClient 4.0.1
> From: olegk@apache.org
> To: httpclient-users@hc.apache.org
> Date: Wed=2C 3 Feb 2010 11:41:25 +0100
>
> On Tue=2C 2010-02-02 at 21:07 +0000=2C Ben Cox wrote:
>> Hi all=2C
>>
>> I'm testing out using chunked encoding with trailing headers at the mome=
nt=2C but seem to be having some problems getting the HttpClient to find th=
e trailers. My code looks like this:
>>
>> /***************************************************************/
>>
>> HttpClient httpClient =3D new DefaultHttpClient()=3B
>> HttpGet httpGet =3D new HttpGet(url)=3B
>>
>> // Tell the server that we can deal with trailers
>> httpGet.addHeader("TE"=2C "trailers")=3B
>>
>> // Get the response
>> HttpResponse response =3D httpClient.execute(httpGet)=3B
>>
>> // Print out all the headers we have
>> for (Header aHeader : response.getAllHeaders()) {
>> System.out.println(aHeader.getName() + ": " + aHeader.getValue())=3B
>> }
>>
>> /***************************************************************/
>>
>> The resultant document is transferred in around 100 chunks.
>>
>> I get all the other trailers I might expect to be printed=2C including t=
he "Trailer: Mytrailer" one that describes what trailers I should I expect.=
 However=2C I don't get "Mytrailer" at all=2C though I can see it on the wi=
re if I use Wireshark.
>>
>> I noticed in the 3.x documentation there seems to be a lot more info abo=
ut chunked encoding and trailers/footers. However=2C there's not so much in=
 the 4.0.1 documentation. Is this not supported any more=2C or just more in=
tegrated into normal headers and I've got something wrong?
>>
>> Any help is much appreciated.
>>
>> Thanks=2C
>> Ben
>>
>
> Hi Ben
>
> I personally have never seen trailers/footers used in any of the
> real-world application. This seems to be no convincing use case for
> them. This is the reason trailing headers in Httpclient 4.0 can only be
> accessed by casting the response InputStream to ChunkInputStream and
> calling ChunkInputStream#getFooters once the end of the stream has been
> reached.
>
> Hope this helps
>
> Oleg
>
>
>
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